CN118677740A

CN118677740A - Communication method and device

Info

Publication number: CN118677740A
Application number: CN202310293173.6A
Authority: CN
Inventors: 韩超; 罗之虎; 金哲; 曲韦霖; 孙欢
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2024-09-20
Also published as: WO2024193407A1

Abstract

The application provides a communication method and equipment, which ensure the availability of FSK modulation symbol transmission by a frequency domain resource bearing frequency shift keying modulation symbol mode, so that a signal receiver can realize signal demodulation by a non-coherent demodulation mode, thereby reducing the power consumption of signal receiver demodulation and improving the communication efficiency. In the method, a first device generates a first signal, the first signal is an OFDM signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1, wherein the first bandwidth and the second bandwidth are used for carrying FSK modulation symbols, the first bandwidth carries a sequence determined by a first information bit, and the second bandwidth carries a sequence determined by a second information bit. The first device transmits the first signal.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communications method and apparatus.

Background

At present, orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) technology is widely used in communication systems to improve spectrum utilization and reduce multipath interference. In an OFDM system, a signal transmitter needs to modulate in a form of mapping an information bit stream into a phase shift keying (PHASE SHIFT KEYING, PSK) symbol or a quadrature amplitude modulation (quadrature amplitude modulation, QAM) symbol, so that a signal receiver performs signal demodulation on the PSK symbol or the QAM symbol by means of coherent demodulation.

However, how to reduce power consumption of devices in a communication system is an important research topic. In general, in order to reduce the power consumption of the device, a signal receiving party often needs to perform signal demodulation, such as envelope detection demodulation, by using a non-coherent demodulation manner, so as to reduce the power consumption and implementation complexity of the signal receiving party demodulation.

Therefore, in the OFDM system, how to realize signal demodulation by the signal receiver through the incoherent demodulation method is a technical problem to be solved.

Disclosure of Invention

The application provides a communication method and equipment for improving communication efficiency.

The first aspect of the present application provides a communication method, which is performed by a first device, or which is performed by a part of the components in the first device (e.g. a processor, a chip or a system on a chip, etc.), or which may also be implemented by a logic module or software which is capable of implementing all or part of the functions of the first device. In the first aspect and its possible implementation manner, the communication method is described by taking the example that the first device is executed by a first device, and the first device may be a terminal device or a network device. In the method, a first device generates a first signal, wherein the first signal is an OFDM signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1; wherein the first bandwidth and the second bandwidth are used to carry Frequency Shift Keying (FSK) modulation symbols; the first device transmits the first signal.

Based on the above technical solution, the first signal sent by the first device is an OFDM signal in the time domain, and the first signal carries the FSK modulation symbol in the frequency domain through the first bandwidth and the second bandwidth, so that the receiver of the first signal can demodulate the FSK modulation symbol by using a non-coherent demodulation manner based on the first signal. Therefore, in the OFDM system, the availability of FSK modulation symbol transmission is ensured by the way of bearing the FSK modulation symbol by frequency domain resources, compared with the process that a signal receiver in the OFDM system carries out signal demodulation by a coherent demodulation way, the signal receiver can realize signal demodulation of the FSK modulation symbol by a noncoherent demodulation way, thereby reducing the power consumption of demodulation of the signal receiver and improving the communication efficiency.

It should be noted that, the number of subcarriers of the first bandwidth and the second bandwidth occupied by the first signal in the frequency domain is greater than 1, where the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth may be the same, so as to reduce the complexity of communication. In addition, the number of subcarriers of the first bandwidth and the second bandwidth may also be different in order to flexibly set the communication bandwidth.

In a possible implementation manner of the first aspect, the first bandwidth carries a sequence determined by first information bits, and the second bandwidth carries a sequence determined by second information bits or the second bandwidth is zero power. Or, the first bandwidth carries a sequence determined by the second information bits or the first bandwidth is zero power and the second bandwidth carries a sequence determined by the first information bits.

Based on the above technical solution, the first bandwidth and the second bandwidth occupied by the first signal in the frequency domain are used for carrying the FSK modulation symbol, where the first bandwidth and the second bandwidth can be used for transmitting the bit stream carried by the FSK modulation symbol in the above manner, so as to realize transmission of the FSK modulation symbol in the OFDM system. And, in the case that one bandwidth carries a non-zero sequence determined by the information bit, the other bandwidth is zero power, so that interference when a signal receiver demodulates the information bit can be eliminated, and the system coverage performance is maximized.

Optionally, in the above implementation, the replacement of the first bandwidth (or the second bandwidth) with zero power is expressed by any one of the following: the first bandwidth (or second bandwidth) is either not carrying signals or is empty (empty) or the first bandwidth (or second bandwidth) is muted (muted).

Alternatively, the plurality of subcarriers occupied by the first bandwidth may be contiguous or non-contiguous in the frequency domain. Similarly, the plurality of subcarriers occupied by the second bandwidth may be contiguous or non-contiguous in the frequency domain. Wherein when a plurality of subcarriers occupied by a certain bandwidth (e.g., a first bandwidth or a second bandwidth) are discontinuous in the frequency domain, at least one of the subcarriers in the bandwidth is unavailable to mute (or not carry information).

It should be understood that the first information bit is bit "1" and the second information bit is bit "0", or that the first information bit is bit "0" and the second information bit is bit "1".

Alternatively, the above implementation may be expressed as: the first bandwidth carries first information bits and the second bandwidth carries second information bits. Or, the first bandwidth carries the second information bits and the second bandwidth carries the first information bits.

Alternatively, the above implementation may be expressed as: the first bandwidth carries high level signals and the second bandwidth carries low level signals. Or, the first bandwidth carries a low level signal and the second bandwidth carries a high level signal.

Alternatively, the above implementation may be expressed as: the first bandwidth carries signals having a signal energy greater than a threshold and the second bandwidth carries signals having a signal energy less than the threshold. Or, the first bandwidth carries signals with signal energy less than a threshold and the second bandwidth carries signals with signal energy greater than the threshold.

Alternatively, the above implementation may be expressed as: the first bandwidth is not muted and the second bandwidth is muted. Or, the first bandwidth is muted and the second bandwidth is not muted.

In a possible implementation manner of the first aspect, the first bandwidth is adjacent to the second bandwidth in a frequency domain.

Based on the technical scheme, the first bandwidth occupied by the first signal on the frequency domain and the second bandwidth are adjacent on the frequency domain, and compared with an implementation mode of demodulating the FSK modulation symbol through the double channels, a frequency guard band is not required to be arranged between the first bandwidth and the second bandwidth, so that the resource cost of the frequency guard band is reduced, and the frequency spectrum utilization rate is improved. And, for the signal sender, by setting the implementation mode of carrying the FSK modulation symbols by two adjacent bandwidths, the total bandwidth of the FSK modulation symbols can be reduced as much as possible, so as to reduce the implementation complexity and reduce the power consumption. In addition, the first bandwidth and the second bandwidth are adjacent in the frequency domain, so that the noise power of the receiving equipment can be reduced, and the signal-to-noise ratio of the demodulation of the receiver signal can be improved, so that the coverage performance of the system can be ensured.

In a possible implementation manner of the first aspect, the first bandwidth and the second bandwidth are separated by at least one subcarrier in a frequency domain, wherein the at least one subcarrier does not carry information or the at least one subcarrier is muted.

Based on the above technical scheme, under the condition that the first bandwidth occupied by the first signal in the frequency domain and the second bandwidth are not adjacent in the frequency domain, at least one subcarrier at the interval between the first bandwidth and the second bandwidth does not bear information (or is mute), transmission interference can be avoided, and demodulation performance of a signal receiver can be improved.

In a possible implementation manner of the first aspect, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal.

It should be understood that the I-path signal, i.e. an in-phase signal, may also be represented as a real signal or as a real part of a signal. The Q-way signal, i.e., the quadrature (quadrat) signal, may also be represented as an imaginary signal or an imaginary part of the signal.

Based on the above technical solution, in an OFDM system, an OFDM signal includes an IQ signal (or expressed as a real signal and an imaginary signal), where the first signal sent by the first device may be one of the IQ signals (or expressed as one of the real signal and the imaginary signal), so that demodulation failure of a signal receiver by a single-channel orthogonal delay receiving manner can be avoided, so as to avoid communication failure. And, for the signal sender, the realization mode of sending one signal in the IQ way signal can reduce radio frequency power consumption. When the first signal comprises IQ two paths of signals, the FM-AM or orthogonal delay receiver cannot realize correct demodulation of the signals, so that the technical scheme can ensure the signal demodulation performance of the FM-AM or orthogonal delay receiver.

In a possible implementation manner of the first aspect, when the device type of the signal receiving side of the first signal is a (frequency modulation amplitude modulation, FM-AM) receiver or an orthogonal delay receiver, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal.

Based on the above technical scheme, in the case that the device type of the signal receiving side of the first signal is an FM-AM receiver or an orthogonal delay receiver, the signal receiving side is a low-power consumption device, so that the above technical scheme can be applied to a low-power consumption communication scene.

It will be appreciated that the signal receiver of the first signal may be provided with one or more device type receivers including at least an FM-AM receiver (or an orthogonal delay receiver). Alternatively, in the case that the signal receiver of the first device may be provided with a receiver of a plurality of device types, other types of receivers may be included in addition to the FM-AM receiver (or the orthogonal delay receiver), for example, a two-channel (or multi-channel) coherent FSK receiver, or a two-channel (or multi-channel) incoherent FSK receiver supporting envelope detection, or a two-channel (or multi-channel) incoherent on-off keying (OOK) receiver supporting envelope detection, or the like.

In a possible implementation manner of the first aspect, the method further includes: the first device transmits indication information indicating a first threshold for demodulating the first signal, wherein the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, a number of OFDM subcarriers occupied by the first bandwidth, a subcarrier spacing of the first bandwidth, a number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier spacing of the second bandwidth.

Based on the above technical solution, the indication information sent by the first device is used to indicate a first threshold, where the first threshold is associated with a first center frequency point of the first bandwidth and a second center frequency point of the second bandwidth, so that a receiver of the indication information can demodulate the first signal based on the first threshold.

In addition, compared with the implementation mode of demodulating the FSK modulation symbol by taking the positive and negative reference values of the received signal as assistance, in the above technical scheme, the first threshold value for demodulating the first signal is determined by the center frequency point of the bandwidth carrying the FSK modulation symbol, the OFDM subcarrier interval and the number of OFDM carriers contained in the occupied bandwidth, that is, the signal demodulation is performed by the bandwidth of the FSK modulation symbol itself and the OFDM carrier parameters, so that the demodulation performance can be improved.

Optionally, the first threshold satisfies:

Wherein f ₁ denotes the first center frequency point, f ₂ denotes the second center frequency point, d (f ₁) denotes a receiving function of the signal transmitted by the first bandwidth, d (f ₂) denotes a receiving function of the signal transmitted by the second bandwidth, min { d (f ₁),d(f₂) } denotes taking the minimum value of d (f ₁) and d (f ₂), and |d (f ₁)-d(f₂) | denotes modulo the difference between d (f ₁) and d (f ₂).

In a possible implementation manner of the first aspect, the first center frequency point of the first bandwidth and the second center frequency point of the second bandwidth satisfy at least one of the following:

2n (f ₁-f₂)＝(2k+1)f_s; or,

2Nf ₁＝lf_s; or alternatively, the first and second heat exchangers may be,

2Nf ₁＝mf_s; or alternatively, the first and second heat exchangers may be,

(N_SCS+1)ΔFn＝pf_s；

Wherein F ₁ represents the first center frequency point, F ₂ represents the second center frequency point, N is a digital delay point, k, l, m, p is an integer, N _SCS is the number of subcarriers of the first bandwidth or the number of subcarriers of the second bandwidth, Δf is a subcarrier spacing, and F _s is the sampling rate of an analog-to-digital converter (analog digital converter, ADC) of the signal receiving side of the first signal.

Based on the above technical scheme, the first center frequency point of the first bandwidth, the center frequency point of the second bandwidth, the OFDM carrier subcarrier interval, the signal bandwidth, and the delay parameter of the signal receiving side delay device satisfy at least one of the above parameters, so as to increase the baseband signal output eye diagram of the receiver, so as to improve the signal demodulation performance.

Optionally, the discrete delay point search range of the received signal of the first signal satisfies:

Q is a time delay factor, the value is a positive integer and the following conditions are satisfied:

Where N _SCS is the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth, Δf is the subcarrier spacing, and F _s is the sampling rate of the analog-to-digital converter ADC of the receiving device of the first signal.

In a possible implementation manner of the first aspect, the method further includes: the first device receives first capability information indicating support for a frequency modulation-amplitude modulation (FM-AM) receiver architecture or a quadrature delay receiver architecture; and/or indicating support for multicarrier-based FM-AM FSK modulation. Therefore, compared with a dual-channel FSK receiver, the FM-AM receiver or the orthogonal delay receiver can realize receiving and demodulating signals by using only a single channel aiming at FSK signals, and the power consumption of the receiver is greatly reduced.

Based on the above technical solution, the first device may receive the at least one capability information, so that the first device definitely determines that the signal receiver has the capability, and performs communication based on the FSK modulation symbol in the OFDM system.

In addition, in the case that the first device receives the first capability information, the first device can make the signal receiver clear as a low-power consumption device or an FM-AM receiver or an orthogonal delay receiver based on the first capability information, and trigger the first device to transmit an FSK modulation symbol in the OFDM system so as to adapt to a low-power consumption communication scene.

In a possible implementation manner of the first aspect, the method further includes: the first device transmits at least one of the following information: information indicating a frequency domain location of the first bandwidth; or, information indicating a frequency domain location of the second bandwidth; or, information indicating a subcarrier spacing; or, information indicating the number of subcarriers of the first bandwidth; or information indicating the number of subcarriers of the second bandwidth, or information indicating a first threshold (i.e., a hard decision or demodulation threshold for receiver incoherent demodulation).

Based on the above technical solution, the first device may further send the at least one item of information, so that the signal receiver can determine a transmission parameter of the first signal based on the at least one item of information, and perform signal demodulation (e.g. determine a frequency domain position of the carrier signal, determine a signal demodulation threshold (e.g. a first threshold described in other implementations) of incoherent demodulation, etc.) based on the transmission parameter, so as to improve a success rate of demodulating the signal.

The second aspect of the present application provides a communication method, which is performed by the second device, or which is performed by a part of the components in the second device (e.g. a processor, a chip or a system on a chip, etc.), or which may also be implemented by a logic module or software which is capable of implementing all or part of the functionality of the second device. In the second aspect and its possible implementation manner, the communication method is described by taking as an example that the second device is executed by the second device, and the second device may be a terminal device. In the method, a second device receives a first signal, wherein the first signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both larger than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the second device demodulates the FSK modulated symbols based on the first signal.

Based on the above technical scheme, the first signal received by the second device is an OFDM signal in the time domain, and the first signal carries the FSK modulation symbol in the frequency domain through the first bandwidth and the second bandwidth, so that the second device can demodulate the FSK modulation symbol through a non-coherent demodulation manner based on the first signal. Therefore, in the OFDM system, the availability of FSK modulation symbol transmission is ensured by the way of bearing the FSK modulation symbol through frequency domain resources, compared with the process that a signal receiver in the OFDM system carries out signal demodulation through a coherent demodulation way, the signal demodulation of the FSK modulation symbol can be realized through a noncoherent demodulation way by the second equipment, so that the power consumption of demodulation of the signal receiver is reduced, and the communication efficiency is improved.

In a possible implementation manner of the second aspect, the first bandwidth carries a sequence determined by first information bits, and the second bandwidth carries a sequence determined by second information bits or the second bandwidth is zero power. Or, the first bandwidth carries a sequence determined by the second information bits or the first bandwidth is zero power and the second bandwidth carries a sequence determined by the first information bits.

Based on the above technical solution, the first bandwidth and the second bandwidth occupied by the first signal in the frequency domain are used for carrying the FSK modulation symbol, where the first bandwidth and the second bandwidth can be used for transmitting the bit stream carried by the FSK modulation symbol in the above manner, so as to realize transmission of the FSK modulation symbol in the OFDM system.

In a possible implementation manner of the second aspect, the first bandwidth is adjacent to the second bandwidth in a frequency domain.

In a possible implementation manner of the second aspect, the first bandwidth and the second bandwidth are separated by at least one subcarrier in a frequency domain, wherein the at least one subcarrier does not carry information or the at least one subcarrier is muted.

Based on the above technical solution, in the case that the first bandwidth occupied by the first signal in the frequency domain and the second bandwidth are not adjacent in the frequency domain, at least one subcarrier spaced between the first bandwidth and the second bandwidth does not carry information (or is mute), so as to avoid transmission interference and improve demodulation performance of the second device.

In a possible implementation manner of the second aspect, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal.

Based on the above technical solution, in an OFDM system, an OFDM signal includes an IQ signal (or expressed as a real signal and an imaginary signal), where a first signal sent by a first device may be one of the IQ signals (or expressed as one of the real signal and the imaginary signal), so that demodulation failure by a second device through a single-channel orthogonal delay receiving manner can be avoided, so as to avoid communication failure. And, for the signal sender, the realization mode of sending one signal in the IQ way signal can reduce radio frequency power consumption. When the first signal comprises IQ two paths of signals, the FM-AM or orthogonal delay receiver cannot realize correct demodulation of the signals, so that the technical scheme can ensure the signal demodulation performance of the FM-AM or orthogonal delay receiver.

In a possible implementation manner of the second aspect, when the device type of the signal receiving side of the first signal is an FM-AM receiver or an orthogonal delay receiver, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal.

It will be appreciated that the second device may be provided with one or more device type receivers including at least an FM-AM receiver (or an orthogonal delay receiver). Alternatively, in the case where the second device may be provided with a plurality of device types of receivers, other types of receivers may be included in addition to the FM-AM receiver (or the orthogonal delay receiver), such as a two-channel (or multi-channel) coherent FSK receiver, or a two-channel (or multi-channel) incoherent FSK receiver supporting envelope detection, or a two-channel (or multi-channel) incoherent on-off keying (OOK) receiver supporting envelope detection, or the like.

In a possible implementation manner of the second aspect, demodulating, by the second device, the FSK modulation symbol based on the first signal includes: the second device demodulates the FSK modulation symbol based on the first signal and a first threshold, wherein the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, a number of OFDM subcarriers occupied by the first bandwidth, a subcarrier spacing of the first bandwidth, a number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier spacing of the second bandwidth.

Based on the above technical scheme, compared with the implementation mode of demodulating the FSK modulation symbol by taking the positive and negative reference values of the received signal as assistance, in the above technical scheme, the first threshold value for demodulating the first signal is determined by the center frequency point of the bandwidth carrying the FSK modulation symbol, that is, the signal demodulation is performed by the bandwidth parameter of the FSK modulation symbol, so that the demodulation performance can be improved.

Optionally, the first threshold satisfies:

In a possible implementation manner of the second aspect, the method further includes: the second device receives indication information indicating the first threshold.

Based on the above technical solution, the indication information received by the second device is used to indicate a first threshold, where the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, the number of OFDM subcarriers occupied by the first bandwidth, a subcarrier interval of the first bandwidth, the number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier interval of the second bandwidth, so that a receiver of the indication information can demodulate the first signal based on the first threshold.

In a possible implementation manner of the second aspect, the first center frequency point of the first bandwidth and the second center frequency point of the second bandwidth satisfy at least one of the following:

2n (f ₁-f₂)＝(2k+1)f_s; or,

2Nf ₁＝lf_s; or alternatively, the first and second heat exchangers may be,

2Nf ₁＝mf_s; or alternatively, the first and second heat exchangers may be,

(N_SCS+1)ΔFn＝pf_s；

Wherein F ₁ represents the first center frequency point, F ₂ represents the second center frequency point, N is a digital delay point, k, l, m, p is an integer, N _SCS is the number of subcarriers of the first bandwidth or the number of subcarriers of the second bandwidth, Δf is a subcarrier spacing, and F _s is the sampling rate of the analog-to-digital converter ADC of the signal receiving side of the first signal.

Where N _SCS is the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth, Δf is the subcarrier spacing, and F _s is the sampling rate of the analog-to-digital converter ADC of the receiving device (i.e., the second device) of the first signal.

In a possible implementation manner of the second aspect, the method further includes: the second device transmitting first capability information indicating support of a frequency modulation-amplitude modulation, FM-AM, receiver structure or a quadrature delay receiver structure; and/or indicating support for multicarrier-based FM-AM FSK modulation. Therefore, compared with a dual-channel FSK receiver, the FM-AM receiver or the orthogonal delay receiver can realize receiving and demodulating signals by using only a single channel aiming at FSK signals, and the power consumption of the receiver is greatly reduced.

Based on the technical scheme, the second device can send the at least one piece of capability information, so that the first device can determine that the second device has the capability based on the capability information, and communicate based on the FSK modulation symbols in the OFDM system.

In addition, when the second device sends the first capability information, the first device can make the signal receiver clear as the low-power consumption device or the FM-AM receiver or the orthogonal delay receiver based on the first capability information, and trigger the first device to transmit the FSK modulation symbol in the OFDM system so as to adapt to the low-power consumption communication scene.

In a possible implementation manner of the second aspect, the method further includes: the second device receives at least one of the following information: information indicating a frequency domain location of the first bandwidth; or, information indicating a frequency domain location of the second bandwidth; or, information indicating a subcarrier spacing; or, information indicating the number of subcarriers of the first bandwidth; or information indicating the number of subcarriers of the second bandwidth, or information indicating a first threshold (i.e., a hard decision or demodulation threshold for receiver incoherent demodulation).

Based on the above technical solution, the second device may further receive the at least one item of information, so that the second device can determine a transmission parameter of the first signal based on the at least one item of information, and perform signal demodulation (e.g. determine a frequency domain location of the carrier signal, determine a signal demodulation threshold (e.g. a first threshold described in other implementations) of incoherent demodulation, etc.) based on the transmission parameter, so as to improve a success rate of demodulation of the signal.

In a possible implementation manner of the second aspect, a magnitude of the delay parameter τ used to demodulate the first signal is less than a duration of 1 OFDM symbol.

Based on the above technical scheme, the second device can demodulate the first signal in an orthogonal self-delay manner, where the size of the delay parameter τ used for demodulating the first signal is smaller than the duration of 1 OFDM symbol, so that signal dislocation can be avoided, and the demodulation success rate is improved.

The third aspect of the present application provides a communication device, and the beneficial effects can be seen in the description of the first aspect, which is not repeated here. The communication device has the functionality to implement the actions in the method example of the first aspect described above. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above. In one possible design, the communication device includes: a transceiver unit and a processing unit; the processing unit is used for generating a first signal, the first signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both larger than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the transceiver unit is used for transmitting the first signal. These modules may also perform the corresponding functions in the method examples of the first aspect, which are specifically referred to in the detailed description of the method examples and are not described herein.

A fourth aspect of the present application provides a communication device, and advantageous effects may be seen in the description of the first aspect, which is not repeated here. The communication device has the functionality to implement the actions in the method example of the first aspect described above. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the functions described above. In one possible design, the communication device includes: a transceiver unit and a processing unit; the receiving and transmitting unit is used for receiving a first signal, the first signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both larger than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the processing unit is configured to demodulate the FSK modulation symbol based on the first signal. These modules may also perform the corresponding functions in the method examples of the first aspect, which are specifically referred to in the detailed description of the method examples and are not described herein.

A fifth aspect of the present application provides a communication apparatus, which may be the first device in the above-described method embodiment, or a chip provided in the first device. The communication device comprises a communication interface and a processor, and optionally a memory. The memory is used for storing a computer program or instructions, and the processor is coupled with the memory and the communication interface, so that when the processor executes the computer program or instructions, the communication device executes the method executed by the first device in the method embodiment.

A sixth aspect of the present application provides a communication apparatus, which may be the second device in the above method embodiment, or a chip provided in the second device. The communication device comprises a communication interface and a processor, and optionally a memory. Wherein the memory is configured to store a computer program or instructions, and the processor is coupled to the memory and the communication interface, and when the processor executes the computer program or instructions, the communication device is configured to perform the method performed by the second apparatus in the above method embodiment.

A seventh aspect of the embodiments of the present application provides a computer-readable storage medium storing one or more computer-executable instructions which, when executed by a processor, perform a method as described above for the first aspect or any one of the possible implementations of the first aspect, or the processor performs a method as described above for the second aspect or any one of the possible implementations of the second aspect.

An eighth aspect of the embodiments of the present application provides a computer program product (or computer program) which, when executed by a processor, performs the method of any one of the possible implementations of the first aspect or the first aspect, or performs the method of any one of the possible implementations of the second aspect or the second aspect.

A ninth aspect of the embodiments of the present application provides a chip system comprising at least one processor for supporting a communication device for implementing the functions involved in the first aspect or any one of the possible implementations of the first aspect, or for supporting a communication device for implementing the functions involved in the second aspect or any one of the possible implementations of the second aspect.

In one possible design, the system-on-chip may further include a memory to hold the necessary program instructions and data for the communication device. The chip system can be composed of chips, and can also comprise chips and other discrete devices. Optionally, the chip system further comprises an interface circuit providing program instructions and/or data to the at least one processor.

A tenth aspect of the embodiments of the present application provides a communication system including the communication apparatus of the third aspect and the communication apparatus of the fourth aspect, and/or the communication system includes the communication apparatus of the fifth aspect and the communication apparatus of the sixth aspect.

The technical effects caused by any one of the design manners of the third aspect to the tenth aspect may be referred to the technical effects caused by the different implementation manners of the first aspect to the second aspect, and are not described herein.

It should be appreciated that for a component in a device, the above-described "transmitting" may be referred to as "outputting" and "receiving" may be referred to as "inputting".

Drawings

FIG. 1 is a schematic diagram of a communication system according to the present application;

Fig. 2a is a schematic diagram of a signal transmitter and a signal receiver according to the present application;

FIG. 2b is a schematic diagram of signal processing provided by the present application;

Fig. 2c is a schematic diagram of a signal receiver according to the present application;

FIG. 2d is a schematic diagram of FSK signal processing according to the present application;

FIG. 3 is a schematic diagram of a communication method according to the present application;

FIG. 4a is a schematic diagram of a first signal provided by the present application;

FIG. 4b is another schematic diagram of the first signal provided by the present application;

FIG. 5 is another schematic diagram of the first signal provided by the present application;

fig. 6a is another schematic diagram of a signal transmitter and a signal receiver according to the present application;

fig. 6b is another schematic diagram of a signal receiver according to the present application;

fig. 6c is another schematic diagram of a signal receiver according to the present application;

FIG. 7a is a schematic diagram of a second apparatus according to the present application;

FIG. 7b is another schematic illustration of a second apparatus provided by the present application;

FIG. 8 is a schematic diagram of a communication device according to the present application;

FIG. 9 is another schematic diagram of a communication device according to the present application;

Fig. 10 is another schematic diagram of a communication device provided by the present application.

Detailed Description

First, some terms in the embodiments of the present application are explained for easy understanding by those skilled in the art.

1. Terminal equipment: may be a wireless terminal device capable of receiving network device scheduling and indication information, which may be a device providing voice and/or data connectivity to a user, or a handheld device having wireless connection capabilities, or other processing device connected to a wireless modem.

The terminal device may communicate with one or more core networks or the internet via a radio access network (radio access network, RAN), and may be a mobile terminal device, such as a mobile phone (or "cellular" phone), a computer, and a data card, e.g., a portable, pocket, hand-held, computer-built-in, or vehicle-mounted mobile device that exchanges voice and/or data with the radio access network. Such as personal communication services (personal communication service, PCS) phones, cordless phones, session Initiation Protocol (SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal Digital Assistants (PDAs), tablet computers (Pad), computers with wireless transceiver capabilities, and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile Station (MS), remote station (remote station), access Point (AP), remote terminal device (remote terminal), access terminal device (ACCESS TERMINAL), user terminal device (user terminal), user agent (user agent), subscriber station (subscriber station, SS), user terminal device (customer premises equipment, CPE), terminal (terminal), user Equipment (UE), mobile Terminal (MT), etc. The terminal device may also be a wearable device as well as a next generation communication system, e.g. a terminal device in a 5G communication system or a terminal device in a future evolved public land mobile network (public land mobile network, PLMN), etc.

2. Network equipment: may be a device in a wireless network, for example, a network device may be a radio access network (radio access network, RAN) node (or device), also referred to as a base station, that accesses a terminal device to the wireless network. Currently, some examples of RAN equipment are: a new generation base station (generation Node B, gNodeB), a transmission-reception point (transmission reception point, TRP), an evolved Node B (eNB), a radio network controller (radio network controller, RNC), a Node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a baseband unit (BBU), or a wireless fidelity (WIRELESS FIDELITY, wi-Fi) Access Point (AP), etc. in a 5G communication system. In addition, in one network architecture, the network device may include a centralized unit (centralized unit, CU) node, or a Distributed Unit (DU) node, or a RAN device including a CU node and a DU node.

Furthermore, the network device may be other means of providing wireless communication functionality for the terminal device, as other possibilities. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the network equipment. For convenience of description, embodiments of the present application are not limited.

The network devices may also include core network devices including, for example, access and mobility management functions (ACCESS AND mobility management function, AMF), user plane functions (user plane function, UPF), or session management functions (session management function, SMF), etc.

In the embodiment of the present application, the means for implementing the function of the network device may be the network device, or may be a means capable of supporting the network device to implement the function, for example, a chip system, and the apparatus may be installed in the network device. In the technical solution provided in the embodiment of the present application, the device for implementing the function of the network device is exemplified by the network device, and the technical solution provided in the embodiment of the present application is described.

3. The terms "system" and "network" in embodiments of the application may be used interchangeably. "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: cases where A alone, both A and B together, and B alone, where A and B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one of A, B, and C" includes A, B, C, AB, AC, BC, or ABC. And, unless otherwise specified, references to "first," "second," etc. ordinal words of embodiments of the present application are used for distinguishing between multiple objects and not for defining a sequence, timing, priority, or importance of the multiple objects.

In order to facilitate understanding of the method provided by the embodiment of the present application, a system architecture of the method provided by the embodiment of the present application will be described below. It can be understood that the system architecture described in the embodiments of the present application is for more clearly describing the technical solutions of the embodiments of the present application, and does not constitute a limitation on the technical solutions provided by the embodiments of the present application.

It is to be appreciated that the present application may be applied to long term evolution (long term evolution, LTE) systems, new Radio (NR) systems, or other communication systems in future communication networks, such as 6G systems.

Fig. 1 is a schematic diagram of a communication system according to the present application. In fig. 1, one network device 101 and 6 terminal devices are exemplarily shown, and the 6 terminal devices are respectively a terminal device 102, a terminal device 103, a terminal device 104, a terminal device 105, a terminal device 106, a terminal device 107, and the like. In the example shown in fig. 1, terminal device 102 is a vehicle, terminal device 103 is an intelligent air conditioner, terminal device 104 is an intelligent fuel dispenser, terminal device 105 is a mobile phone, terminal device 106 is an intelligent teacup, and terminal device 107 is a printer.

It should be noted that, fig. 1 is an exemplary scenario of a communication system provided by the present application, in an embodiment of a method provided by the present application, a signal sender (for example, a first device) may be a network device shown in fig. 1 and a signal receiver (for example, a second device) may be any terminal device shown in fig. 1, or a signal sender (for example, a first device) may be any terminal device shown in fig. 1 and a signal receiver (for example, a second device) may be other terminal devices shown in fig. 1.

In addition, the signal sender and the signal receiver according to the present application are not limited to the communication scenario shown in fig. 1, and the communication scenario according to the present application will be further described with reference to more drawings.

In a possible implementation manner, the present application may be applied to an LTE wireless communication system, an NR wireless communication system, and an NR wireless communication system that evolves in the future. For example, the present application can be applied to OFDM systems in LTE, OFDM systems in NR, and future OFDM systems, OFDM-like systems, and the like. Among them, the OFDM system is essentially a frequency division system, and uses multiple carriers (called subcarriers) to transmit information streams. The multiple sub-carriers are mutually orthogonal in time domain and mutually overlapped in frequency domain, the channel is divided into a plurality of orthogonal sub-channels, the high-speed data signal is converted into parallel low-speed sub-data streams, and the parallel low-speed sub-data streams are modulated on each sub-channel for transmission. Each subcarrier channel of OFDM can be considered as flat fading, which can improve multipath fading resistance. In engineering, the OFDM waveform may be implemented by FFT and its inverse. Meanwhile, to combat the memory of the channel, and eliminate inter-symbol interference and inter-code interference, OFDM generally introduces a Cyclic Prefix (CP) as a guard interval.

In addition, in the OFDM system, a signal transmitter needs to modulate in a form of mapping an information bit stream into a phase shift keying (PHASE SHIFT KEYING, PSK) symbol or a quadrature amplitude modulation (quadrature amplitude modulation, QAM) symbol, so that a signal receiver performs signal demodulation on the PSK symbol or the QAM symbol by means of coherent demodulation.

In an implementation example of an OFDM system, as shown in fig. 2a, an OFDM system is exemplified for transmission through QAM modulation symbols. As shown in fig. 2a, the signal processing procedure of the signal transmitter includes inputting a bit sequence to the QAM encoder, obtaining encoded information, sequentially performing serial/parallel conversion, IFFT, CP addition, parallel/serial conversion, digital-to-analog converter (digital analog converter, DAC) performing digital-to-analog (D/a) processing, and then transmitting the processed information through a channel, so that the signal receiver can receive a wireless signal. As shown in fig. 2b, the demodulation process of the signal receiving side includes ADC performing analog/digital (a/D), serial/parallel conversion, decp, FFT, parallel/serial conversion, QAM decoder, etc. processing to output a bit sequence.

In another implementation example of the OFDM system, as shown in fig. 2b, an implementation procedure in which the base station is a signal sender in the OFDM system is taken as an example. The modulation technology adopted by the base station system is the combination of digital modulation and analog modulation, and the combination of amplitude modulation and phase modulation. A typical base station modulation model is shown in fig. 2b, and mainly comprises the following procedures:

1. Baseband processing: after serial-to-parallel conversion and constellation mapping of the baseband signal (binary bit stream), OFDM modulation is performed through a plurality of mutually orthogonal subcarriers, and I, Q digital signals are output.

2. Intermediate frequency processing: the digital signals after baseband processing are transmitted to a wireless remote unit (remote radio unit, RRU) through a common public radio interface (common public radio interface, CPRI), and two paths of analog signals are output I, Q through digital up-conversion and digital-to-analog conversion.

3. And (3) radio frequency treatment: and carrying out in-phase quadrature (in phase quadrature phase, IQ) modulation on the two paths of analog signals after the intermediate frequency processing, and outputting radio frequency signals to realize frequency shifting.

However, how to reduce power consumption of devices in a communication system is an important research topic. In general, conventional receivers (such as the signal receiver shown in fig. 2 a) are mainly applied to scenarios with high requirements on data rate and reliability, where signal modulation modes are complex, and the receiver needs to use some high-performance and high-precision module circuits. Such as a high linearity mixer, a high precision sampled discrete fourier transform/fast fourier transform (Discrete Fourier Transform/Fast Fourier Transform, DFT/FFT) module, a voltage controlled oscillator that can provide a high precision local oscillator, etc. In order to ensure the performance of the circuit module, the power consumption of the receiver cannot be reduced. The low power receiver needs to meet stringent power consumption constraints, for example less than 1mW, compared to conventional receivers. By amplitude modulation and/or frequency shift keying modulation, the receiver can detect the signal in an envelope detection mode, and further avoid using high-power-consumption circuit modules, such as an FFT module, a high-linearity mixer, a high-precision voltage-controlled oscillator and the like, so that a lower power consumption level can be achieved.

In order to reduce the power consumption of the device, the signal receiving party often needs to perform signal demodulation, such as envelope detection demodulation, by adopting a non-coherent demodulation mode, so as to reduce the power consumption and the implementation complexity of the demodulation of the signal receiving party. The implementation of incoherent demodulation will be described exemplarily below in connection with the implementation examples shown in fig. 2c and 2 d.

As an example of implementation, the receiver shown in fig. 2c may be used to implement incoherent demodulation, since the receiver is typically used in a low power scenario, for which reason the receiver shown in fig. 2c may be referred to as a low power receiver, which has an orthogonal self-delay structure of the indefinite intermediate frequency as illustrated. The example shown in fig. 2c is mainly directed to Binary Frequency Shift Keying (BFSK) for demodulation and reception, and mainly includes the illustrated radio frequency filter (including band-PASS FILTER (BPF)), mixer, frequency calibrator, delay, low-pass filter (low-PASS FILTER, LPF), and the like. The radio frequency signal is converted into an intermediate frequency signal with lower frequency through a mixer, then the signal is divided into two paths, one path is kept unchanged, the other path is mixed with the radio frequency signal after being processed by a time delay device, and the baseband signal can be demodulated and output through an LPF when the time delay size meets a certain orthogonality condition.

As shown in fig. 2c, the receiver structure is required to provide a local oscillator signal to the rf signal when it is down-converted to an intermediate frequency. In order to simplify the structure and reduce the power consumption, a ring oscillator is generally used to generate the local oscillation signal. However, the frequency offset generated by the ring oscillator is large and varies within a certain range, so that the frequency of the intermediate frequency signal after being mixed by the ring oscillator is uncertain, and thus the receiver structure becomes an indefinite intermediate frequency structure. The local oscillator signal frequency produced by the ring oscillator is inaccurate and may vary over time and temperature, and additional frequency calibration circuitry may be required to calibrate the frequency of the wake-up oscillator, as indicated by the dashed box label in fig. 2 c.

In addition, the conventional 2FSK envelope detection receiver requires two narrow-band filters to align the modulation frequency for reception demodulation. However, one of the main characteristics of the indefinite if structure shown in fig. 2c is that the frequency of the if signal is dynamically shifted, so that the conventional envelope detection scheme based on the narrow-band filter cannot be applied, because the larger frequency shift is likely to cause that the frequency of the signal cannot fall within the passband range of the narrow-band filter. In order to avoid using two paths of narrow-band-pass filters, the low-power consumption receiver of the above example delays the signal, mixes the signal with the original signal, and outputs the signal through the low-pass filter, so that the low-power consumption receiver is called a quadrature self-delay method. The basic principle is as follows:

the intermediate frequency signal expression is:

Wherein s (t) represents an intermediate frequency signal, f ₀ represents an intermediate frequency signal frequency, Δf represents an offset of a modulation frequency and the intermediate frequency, Representing the initial phase.

After that, the intermediate frequency signal is subjected to time delay tau to obtain a signal s (t-tau), and then the signal s is mixed with the intermediate frequency signal to obtain:

Wherein when the delay tau controlled by the delay unit meets the quadrature condition And in the process, the signal after quadrature self-mixing is subjected to low-pass filtering to obtain a baseband signal sin (+ -2 pi delta f tau). The original bitstream signal may be determined to be 0 or 1 according to the positive and negative of the signal.

From the above-described low power receiver architecture and principles, it can be seen that the low power receiver generally does not have a voltage controlled oscillator that provides an accurate local oscillator, a high sampling FFT module, and an accurate narrow band filter to avoid the high power consumption generated by these devices.

As described above, the method for reducing the power consumption of the receiver may be to receive in an incoherent manner, and the manner of supporting incoherent reception includes on-off keying (OOK) modulation, FSK modulation, etc., and an exemplary implementation of FSK modulation will be described below with reference to the implementation process shown in fig. 2 d.

Specifically, the FSK modulation method is to adjust the frequency of the carrier according to the value of the digital signal, and meanwhile, the amplitude and the phase of the carrier remain unchanged. The transmitted digital signal is in binary form consisting of 0 and 1, and the modulated signal (digital signal) as shown in fig. 2d may be denoted as "10110", and the modulated signal is shown as "symbol 1, symbol 2, symbol 3, symbol 4 and symbol 5" in fig. 2 d. Compared to the modulated signal (carrier signal), the modulated signal corresponds to a high frequency when the bit is 1 (e.g., the symbol waveform "representing 1" in fig. 2 d), and corresponds to a low frequency when the bit is 0 (e.g., the symbol waveform "representing 0" in fig. 2 d). The FSK modulation mode is to modulate 1 bit of data into one symbol, the symbol waveforms corresponding to the modulated signals are 2, only 1 and 0 data can be transmitted, and the FSK modulation mode is also called BFSK, a receiving and transmitting loop is simple, the anti-interference performance is good, but the FSK modulation mode occupies a large bandwidth if the transmission rate is to be improved, and is generally not suitable for high-speed communication. It can be appreciated that for BFSK, the conventional receiver has a dual-channel structure, corresponding to two frequency bands, i.e., high and low frequency. Since the fundamental principle of FSK is frequency modulation, no constellation is involved.

As can be seen from the description of fig. 2a to 2d, in the current OFDM system, the signal receiver needs to perform signal demodulation on PSK symbols or QAM symbols by using coherent demodulation. In order to reduce the power consumption of the device, the signal receiver often needs to demodulate the signal by means of incoherent demodulation. Therefore, in the OFDM system, how to realize signal demodulation by the signal receiver through the incoherent demodulation method is a technical problem to be solved.

In order to solve the above problems, the present application provides a communication method and apparatus, which are used in an OFDM system, to ensure availability of FSK modulation symbol transmission by carrying FSK modulation symbols by frequency domain resources, compared with the process that a signal receiver carries out signal demodulation in an OFDM system through a coherent demodulation mode, the method can enable the signal receiver to realize signal demodulation of FSK modulation symbols through a noncoherent demodulation mode, further reduce power consumption of demodulation of the signal receiver and improve communication efficiency. The technical scheme provided by the application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 3, a schematic diagram of a communication method according to the present application is provided, and the method includes the following steps.

It should be noted that, in fig. 3, the method is illustrated by taking the first device and the second device as the execution bodies of the interactive instruction, but the present application is not limited to the execution bodies of the interactive instruction. For example, in fig. 3 and the corresponding embodiments, the execution body in S301 to S303 is the first device, and the execution body may also be a chip, a chip system, or a processor that supports the first device to implement the method, or may also be a logic module or software that can implement all or part of the functions of the first device. The second device in S301-S303 in fig. 3 and the corresponding embodiment may also be replaced by a chip, a system on a chip, or a processor supporting the second device to implement the method, or may also be replaced by a logic module or software capable of implementing all or part of the functions of the second device.

S301, the first device generates a first signal. The first signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1.

S302, the first device sends a first signal, and correspondingly, the second device receives the first signal.

It should be noted that, in step S302, the number of subcarriers of the first bandwidth and the second bandwidth occupied by the first signal sent by the first device in the frequency domain is greater than 1, where the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth may be the same, so as to reduce the complexity of communication. In addition, the number of subcarriers of the first bandwidth and the second bandwidth may also be different in order to flexibly set the communication bandwidth.

In one possible implementation, the first bandwidth carries a sequence determined by the first information bits and the second bandwidth carries a sequence determined by the second information bits or the second bandwidth is zero power. Or, the first bandwidth carries a sequence determined by the second information bits or the first bandwidth is zero power and the second bandwidth carries a sequence determined by the first information bits. Specifically, a first bandwidth and a second bandwidth occupied by the first signal in the frequency domain are used for carrying FSK modulation symbols, where the first bandwidth and the second bandwidth can be used for transmitting a bit stream carried by the FSK modulation symbols in the above manner, so as to realize transmission of the FSK modulation symbols in the OFDM system.

Alternatively, the above implementation may be expressed as: the first bandwidth carries a high level signal and the second bandwidth carries a low level signal, or the first bandwidth carries a low level signal and the second bandwidth carries a high level signal.

In one possible implementation, the first bandwidth is adjacent to the second bandwidth in the frequency domain. Specifically, a first bandwidth occupied by the first signal on the frequency domain and a second bandwidth occupied by the first signal on the frequency domain are adjacent to each other, and compared with an implementation mode of demodulating the FSK modulation symbol through two channels, a frequency guard band is not required to be arranged between the first bandwidth and the second bandwidth, so that resource overhead of the frequency guard band is reduced, and the frequency spectrum utilization rate is improved. And, for the signal sender, by setting the implementation mode of carrying the FSK modulation symbols by two adjacent bandwidths, the total bandwidth of the FSK modulation symbols can be reduced as much as possible, so as to reduce the implementation complexity and reduce the power consumption. In addition, the first bandwidth and the second bandwidth are adjacent in the frequency domain, so that the noise power of the receiving equipment can be reduced, and the signal-to-noise ratio of the demodulation of the receiver signal can be improved, so that the coverage performance of the system can be ensured.

In one possible implementation, the first bandwidth and the second bandwidth are separated in the frequency domain by at least one subcarrier, wherein the at least one subcarrier carries no information or the at least one subcarrier is muted. Specifically, in the case that the first bandwidth and the second bandwidth occupied by the first signal in the frequency domain are not adjacent in the frequency domain, at least one subcarrier spaced between the first bandwidth and the second bandwidth does not carry information (or is muted), so that transmission interference can be avoided, and demodulation performance of a signal receiving party can be improved.

It should be noted that, the first signal may occupy N (N is a positive integer) symbols in the time domain, and the first bandwidth and the second bandwidth occupied in the frequency domain may occupy m (m is a positive integer greater than 1) subcarriers and k (k is a positive integer greater than 1) subcarriers, respectively. The signal transmission structure of the first signal will be exemplarily described with reference to the examples shown in fig. 4a and 4b, taking the value of N as 4 and the values of m and k as 3.

As an implementation example, as shown in fig. 4a, the subcarriers occupied by the first bandwidth are contiguous with the subcarriers occupied by the second bandwidth in the frequency domain. Another implementation is illustrated in fig. 4b, where the subcarriers occupied by the first bandwidth are spaced apart from the subcarriers occupied by the second bandwidth by at least one subcarrier in the frequency domain. The center frequency point of the subcarrier occupied by the first bandwidth may be denoted as f1, the center frequency point of the subcarrier occupied by the second bandwidth may be denoted as f2, and the center frequency point of the at least one subcarrier may be denoted as f3.

Illustratively, in fig. 4a and 4b, the 3 subcarriers contained in the first bandwidth carry bit 1 on symbol 1 and symbol 3, and the 3 subcarriers contained in the second bandwidth carry bit 0 on symbol 2 and symbol 4. Or 3 subcarriers contained in the first bandwidth carry bit 0 on symbol 1 and symbol 3 and 3 subcarriers contained in the second bandwidth carry bit 1 on symbol 2 and symbol 4.

As another implementation example, fig. 5 is a schematic diagram of FSK transmission band occupation. As shown in the implementation of the dual-channel FSK on the left side of fig. 5, the signal receiving side needs to be provided with two sets of receivers to demodulate the frequency bands with the center frequency points f1 and f2, and for this purpose, a certain frequency guard band needs to be set for the two frequency bands so as to avoid mutual interference between the two sets of receivers. As shown in the implementation of the orthogonal delay FSK on the right side of fig. 5, the implementation is a schematic diagram of the implementation of the second device; the FSK signals occupy continuous subcarrier blocks, so that the resource cost of frequency guard bands is reduced compared with the double-channel FSK signals, and the spectrum utilization rate is improved. For example, the first signal may occupy an edge frequency band outside the NR frequency band in the frequency domain, reduce allocation of guard bands, reduce frequency resource overhead, and be compatible with signal transmission of NR. In addition, considering that the second device receives the first signal through a single channel, the high-low frequency band signals (i.e. signals on the frequency bands with the central frequency points f1 and f2 in the illustration) will be received simultaneously, so that the first signal occupies two continuous subcarrier blocks on the frequency domain, the introduction of interference/noise signals can be reduced, and the communication coverage capability of the system is improved.

In one possible implementation, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal. Specifically, in the OFDM system, the OFDM signal includes an IQ signal (or expressed as a real signal and an imaginary signal), where the first signal sent by the first device may be one of the IQ signal (or expressed as one of the real signal and the imaginary signal), so that demodulation failure of the signal receiver by a single-channel orthogonal delay receiving manner can be avoided, so as to avoid communication failure. And, for the signal sender, the realization mode of sending one signal in the IQ way signal can reduce radio frequency power consumption. When the first signal comprises IQ two paths of signals, the FM-AM or orthogonal delay receiver cannot realize correct demodulation of the signals, so that the technical scheme can ensure the signal demodulation performance of the FM-AM or orthogonal delay receiver.

Illustratively, in fig. 6a, the first signal comprises an I-path signal and a Q-path signal in the OFDM signal. As for the signal receiving side of the first signal, the signal receiving side of the first signal performs a signal receiving process through a self-delay structure (such as the receiver structure shown in fig. 2 c), as shown in fig. 6a, the signal after being processed by the LPF will make the received signal with the first bandwidth (denoted as d (f ₁)) and the received signal with the second bandwidth (denoted as d (f ₂)) identical or similar (denoted as d (f ₁)＝d(f₂)), which will result in that the signal eye opening value of the signal after being processed by the LPF is almost 0, and thus it is difficult to identify the signals with different frequency points, which may possibly result in signal demodulation failure.

In the above technical solution, the first signal sent by the first device may be one of the IQ signals, so as to avoid demodulation failure of the signal receiver by a single-channel orthogonal delay receiving manner, so as to avoid communication failure.

As an implementation example, in the case where the first signal transmitted by the first device in step S302 is a Q-way signal, the signal processing procedure of the first device is as shown in fig. 6b, and the signal transmitted by the first device is processed by the DAC, and then the I-way signal is discarded (or ignored or deleted), and the signal input to the up-conversion processing includes the Q-way signal and does not include the I-way signal.

As another implementation example, in the case where the first signal transmitted by the first device in step S302 is an I-channel signal, the signal processing procedure of the first device is as shown in fig. 6c, and the signal transmitted by the first device is processed by the DAC and then the Q-channel signal is discarded (or ignored or deleted), and the signal input to the up-conversion processing includes the I-channel signal and does not include the Q-channel signal.

In one possible implementation, when the device type of the signal receiving side (i.e., the second device) of the first signal is a (frequency modulation amplitude modulation, FM-AM) receiver or an orthogonal delay receiver, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal.

Alternatively, the first device may learn the device type of the second device in a preconfigured manner, or the first device may learn the device type of the second device in a manner that interacts with the second device in advance, which is not limited herein.

It will be appreciated that the signal receiver (e.g., second device) of the first signal may be provided with one or more device type receivers including at least an FM-AM receiver (or quadrature delay receiver).

In one implementation example, as shown in fig. 7a, the signal receiver of the first device may be provided with a device type receiver, i.e. the low power receiver in fig. 7 a.

In one implementation example, where the signal receiver of the first device may be provided with multiple device type receivers, other types of receivers may be included in addition to the FM-AM receiver (or quadrature delay receiver). For example, as shown in fig. 7b, the FM-AM receiver may be referred to as a low power receiver in the figure, and when the low power receiver performs signal reception and signal demodulation, the main receiver is triggered to turn off or sleep so as to enable the device to enter a low power state, where the main receiver may include a dual-channel (or multi-channel) coherent FSK receiver, or a dual-channel (or multi-channel) incoherent FSK receiver supporting envelope detection, or a dual-channel (or multi-channel) incoherent on-off keying (OOK) receiver supporting envelope detection, or the like.

Alternatively, in the case where the signal receiving side (e.g., second device) of the first signal is provided with receivers of a plurality of device types, the receivers of the plurality of device types may share part of devices such as ADC, BPF, etc.

S303, the second device demodulates the FSK modulation symbols based on the first signal.

In one possible implementation, in step S303, demodulating, by the second device, the FSK modulation symbol based on the first signal includes: the second device demodulates the FSK modulation symbol based on the first signal and a first threshold, wherein the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, a number of OFDM subcarriers occupied by the first bandwidth, a subcarrier spacing of the first bandwidth, a number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier spacing of the second bandwidth. In the above technical scheme, a first threshold value for demodulating the first signal is determined through a center frequency point of a bandwidth carrying the FSK modulation symbol, that is, signal demodulation is performed through a bandwidth parameter of the FSK modulation symbol, so that demodulation performance can be improved.

Optionally, the first threshold satisfies:

In one possible implementation, the method further includes: the second device receives indication information indicating the first threshold. Specifically, the indication information received by the second device is used for indicating a first threshold, where the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, the number of OFDM subcarriers occupied by the first bandwidth, a subcarrier spacing of the first bandwidth, the number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier spacing of the second bandwidth, so that a receiver of the indication information can demodulate the first signal based on the first threshold. In addition, compared with the implementation mode of demodulating the FSK modulation symbol by taking the positive and negative reference values of the received signal as assistance, in the above technical scheme, the first threshold value for demodulating the first signal is determined by the center frequency point of the bandwidth carrying the FSK modulation symbol, the OFDM subcarrier interval and the number of OFDM carriers contained in the occupied bandwidth, that is, the signal demodulation is performed by the bandwidth of the FSK modulation symbol itself and the OFDM carrier parameters, so that the demodulation performance can be improved.

In one possible implementation, the first center frequency point of the first bandwidth and the second center frequency point of the second bandwidth satisfy at least one of:

2n (f ₁-f₂)＝(2k+1)f_s; or,

2Nf ₁＝lf_s; or alternatively, the first and second heat exchangers may be,

2Nf ₁＝mf_s; or alternatively, the first and second heat exchangers may be,

(N_SCS+1)ΔFn＝pf_s；

Wherein F ₁ represents the first center frequency point, F ₂ represents the second center frequency point, N is a digital delay point, k, l, m, p is an integer, N _SCS is the number of subcarriers of the first bandwidth or the number of subcarriers of the second bandwidth, Δf is a subcarrier spacing, and F _s is the sampling rate of the analog-to-digital converter ADC of the signal receiving side (i.e. the second device) of the first signal.

Specifically, the first center frequency point of the first bandwidth, the center frequency point of the second bandwidth, the OFDM carrier subcarrier interval, the signal bandwidth, and the delay parameter of the signal receiving side delay device satisfy at least one of the above parameters, so that the baseband signal output eye diagram of the receiver can be increased, so as to improve the signal demodulation performance.

For example, under the ideal frequency offset-free condition, if the number of subcarriers occupied by the first bandwidth and the number of subcarriers occupied by the second bandwidth are both (N _SCS +1), the center frequency point of the first bandwidth and the center frequency point of the second bandwidth are respectively denoted as { F ₁,f₂ }, the subcarrier frequency interval or the frequency width Δf, the delay parameter τ or the discrete delay point number N, so that they satisfy the following relation, which is expressed as:

Wherein the above relation represents the value of τ by the control variable { F ₁,f₂ }, Δf, such that |d (F ₁)-d(f₂) | takes the maximum value. Specifically, for the second device (the device type of the second device is an FM-AM receiver or an orthogonal delay receiver), the signal output eye opening value of the FSK signal after low-pass filtering is |d (f ₁)-d(f₂) |, and if the eye size is 0 (i.e., d (f ₁)＝d(f₂)), it is difficult to identify the different frequency point signals even if the delay τ is adjusted. Therefore, in order to obtain the best demodulation performance, it is necessary to configure the related system parameter maximization |d (f ₁)-d(f₂) |.

Wherein the first signal may be expressed as:

Wherein the number of subcarriers occupied by the first bandwidth and the number of subcarriers occupied by the second bandwidth are (N _SCS +1), a [ k ] is the k-th carrier amplitude, Δf is the OFDM subcarrier spacing, i=1or 2 and F ₁ represent the center frequency point of the first bandwidth and F ₂ represent the center frequency point of the second bandwidth, j represents the imaginary part (i.e., j ² = -1), and phi represents the initial phase.

When for any a [ k ]The center frequency point of the first bandwidth and the center frequency point of the second bandwidth are respectively marked as f ₁ and f ₂, and the following can be obtained:

thus, it is possible to obtain:

Wherein, The generation of high-amplitude periodic impulse, when |d (f ₁)-d(f₂) | is maximum, needs to satisfy:

a) (N _SCS +1) pi.DELTA. fτ=ppi such that The amplitude is maximum;

b) The [ cos (2pi f ₁τ)-cos(2πf₂ tau) ] maximum amplitude is 2, i.e. 2pi f ₁τ＝lπ,2πf₁ tau=mpi and 2pi (f ₁-f₂) tau= (2k+1) pi is satisfied.

Where τ=n/f _s, k, l, m, p are integers.

The following can be concluded: the FSK transmission system selects subcarrier blocks and delay coefficients satisfying the following relationship to obtain the best demodulation performance: a) 2n (f ₁-f₂)＝(2k+1)f_s,b)2nf₁＝lf_s or 2nf ₁＝mf_s,c)(N_SCS+1)ΔFn＝pf_s, k, l, m, p are integers, f ₁ and f ₂ are the center frequency points of the subcarrier block, f _s is the receiver ADC sampling rate, and n is a digital delay point.

Alternatively, when 2n (f ₁-f₂)＝2kf_s), cos (2pi f ₁τ)-cos(2πf₂τ)＝0,|d(f₁)-d(f₂) |=0, the second device may not be able to achieve normal demodulation of the FSK signal.

In one possible implementation, if the first bandwidth and the second bandwidth are adjacent, the discrete delay point search range (denoted as n ^*) is truncated to:

Where Q is a delay factor, the number of subcarriers occupied by the first bandwidth and the number of subcarriers occupied by the second bandwidth are (N _SCS +1), F _s is the sampling rate of the ADC of the signal receiver (i.e., the second device) of the first signal, and Δf is the OFDM subcarrier spacing.

In addition, the delay factor Q is a positive integer and satisfies

For example, the OFDM subcarrier spacing Δf=30 kHz, assuming that the first bandwidth and the second bandwidth are each one Resource Block (RB) (including 12 Resource Elements (REs)), the RB width is 360 kilohertz (kHz), the center frequency points of the first bandwidth and the second bandwidth are respectively F ₁＝600kHz,f₂ =960 kHz, the sampling rate F _s＝N_FFT*ΔF,N_FFT =512 of the receiving end ADC, and the discrete delay point number satisfiesQ=1, and the best delay coefficient n ^* =19 can be obtained by searching, so that the UE receiver has the best demodulation performance and meets the requirements of The discrete time delay point searching range can be reduced, and the algorithm complexity is reduced.

In one possible implementation, the method further includes: the second device transmitting first capability information indicating support of a frequency modulation-amplitude modulation, FM-AM, receiver structure or a quadrature delay receiver structure; and/or indicating support for multicarrier-based FM-AM FSK modulation. Specifically, the second device may send the at least one capability information, so that the first device determines, based on the capability information, that the second device has the capability, and performs communication based on the FSK modulation symbol in the OFDM system. Therefore, compared with a dual-channel FSK receiver, the FM-AM receiver or the orthogonal delay receiver can realize receiving and demodulating signals by using only a single channel aiming at FSK signals, and the power consumption of the receiver is greatly reduced.

In one possible implementation, the method further includes: the second device receives at least one of the following information: information indicating a frequency domain location of the first bandwidth; or, information indicating a frequency domain location of the second bandwidth; or, information indicating a subcarrier spacing; or, information indicating the number of subcarriers of the first bandwidth; or information indicating the number of subcarriers of the second bandwidth, or information indicating a first threshold (i.e., a hard decision or demodulation threshold for receiver incoherent demodulation). Specifically, the second device may further receive the at least one item of information, so that the second device can determine a transmission parameter of the first signal based on the at least one item of information, and perform signal demodulation (e.g. determine a frequency domain position of the carrier signal, determine a signal demodulation threshold (e.g. a first threshold described in other implementations) of incoherent demodulation based on the transmission parameter, and so on, so as to improve a success rate of demodulating the signal.

In one possible implementation, the magnitude of the delay parameter τ used to demodulate the first signal is less than the duration of 1 OFDM symbol. Specifically, the second device may demodulate the first signal in an orthogonal self-delay manner, where the size of the delayer parameter τ used for demodulating the first signal is smaller than the duration of 1 OFDM symbol, so that signal dislocation can be avoided, so as to improve the demodulation success rate.

Based on the technical solution shown in fig. 3, the first signal sent by the first device in step S301 is an OFDM signal in the time domain, and the first signal carries FSK modulation symbols in the frequency domain through a first bandwidth and a second bandwidth, so that the second device can demodulate the FSK modulation symbols in a non-coherent demodulation manner based on the first signal in step S303. Therefore, in the OFDM system, the availability of FSK modulation symbol transmission is ensured by the way of bearing the FSK modulation symbol by frequency domain resources, so that a signal receiver can realize signal demodulation by a non-coherent demodulation way, thereby reducing the power consumption of signal receiver demodulation and improving the communication efficiency.

As can be seen from the technical scheme, the technical scheme provided by the application has the following beneficial effects:

In some embodiments, effective compatibility with an OFDM transmission mechanism is realized, meanwhile, information is carried on different bandwidths, one signal (or a signal takes a real part or a signal takes an imaginary part) of an I-path signal and a Q-path signal is sent, availability of an FSK transmission system is guaranteed, and system spectrum efficiency and coverage performance are improved.

In some embodiments, the performance of the FSK transmission method is improved by designing the signal demodulation threshold of the signal receiver and designing the small discrete delay point search range of the signal receiver, so that the demodulation performance of the FSK can be optimized.

In some embodiments, the usability and integrity of low power FSK transmission system schemes is ensured by the capability interactions between different devices and/or the interactions of FSK signal parameters.

The embodiments of the present application are described above in terms of methods, and the communications device in the embodiments of the present application is described below in terms of implementation of a specific device.

Referring to fig. 8, an embodiment of the present application provides a schematic diagram of a communication device 800, where the communication device 800 at least includes a processing unit 801 and a transceiver unit 802.

The communication apparatus 800 may be the first device, or the apparatus may be a component in the first device (e.g., a processor, a chip, or a system-on-chip, etc.), or the apparatus may also be a logic module or software capable of implementing all or part of the functions of the first device.

Taking the communication apparatus 800 as an example of an implementation manner of the first device, the processing unit 801 is configured to generate a first signal, where the first signal is an OFDM signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the transceiver unit 802 is configured to transmit the first signal.

In one possible implementation, the first bandwidth carries a sequence determined by first information bits and the second bandwidth carries a sequence determined by second information bits or the second bandwidth is silent, or the first bandwidth carries a sequence determined by second information bits or the first bandwidth is silent and the second bandwidth carries a sequence determined by first information bits.

In one possible implementation, the first bandwidth is adjacent to the second bandwidth in the frequency domain.

In one possible implementation, the first bandwidth and the second bandwidth are separated in the frequency domain by at least one subcarrier, wherein the at least one subcarrier carries no information or the at least one subcarrier is muted.

In one possible implementation, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal.

In one possible implementation manner, when the device type of the signal receiving side of the first signal is an FM-AM receiver or an orthogonal delay receiver, the first signal is one of an I-path signal, a Q-path signal, a real-part signal, and an imaginary-part signal of the OFDM signal.

In a possible implementation manner, the transceiver unit 802 is further configured to send indication information indicating a first threshold, where the first threshold is used for demodulating the first signal, and the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, a number of OFDM subcarriers occupied by the first bandwidth, a subcarrier interval of the first bandwidth, a number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier interval of the second bandwidth.

In one possible implementation, the first threshold value satisfies:

2n (f ₁-f₂)＝(2k+1)f_s; or,

2Nf ₁＝lf_s; or alternatively, the first and second heat exchangers may be,

2Nf ₁＝mf_s; or alternatively, the first and second heat exchangers may be,

(N_SCS+1)ΔFn＝pf_s；

In one possible implementation, the transceiver unit 802 is further configured to receive first capability information indicating that a frequency modulation-amplitude modulation FM-AM receiver structure or an orthogonal delay receiver structure is supported; and/or indicating support for multicarrier-based FM-AM FSK modulation.

In a possible implementation manner, the transceiver unit 802 is further configured to send at least one of the following information: information indicating a frequency domain location of the first bandwidth; or, information indicating a frequency domain location of the second bandwidth; or, information indicating a subcarrier spacing; or, information indicating the number of subcarriers of the first bandwidth; or information indicating the number of subcarriers of the second bandwidth, or information indicating a first threshold (i.e., a hard decision or demodulation threshold for receiver incoherent demodulation).

Taking the communication apparatus 800 as an example of an implementation manner of the second device, the transceiver unit 802 is configured to receive a first signal, where the first signal is an OFDM signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the processing unit 801 is configured to demodulate the FSK modulated symbol based on the first signal.

In one possible implementation, the processing unit 801 is specifically configured to demodulate the FSK modulation symbol based on the first signal and a first threshold, where the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, a number of OFDM subcarriers occupied by the first bandwidth, a subcarrier spacing of the first bandwidth, a number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier spacing of the second bandwidth.

In one possible implementation, the first threshold value satisfies:

In a possible implementation, the transceiver unit 802 is further configured to receive indication information indicating the first threshold value.

2n (f ₁-f₂)＝(2k+1)f_s; or,

2Nf ₁＝lf_s; or alternatively, the first and second heat exchangers may be,

2Nf ₁＝mf_s; or alternatively, the first and second heat exchangers may be,

(N_SCS+1)ΔFn＝pf_s；

In a possible implementation, the transceiver unit 802 is further configured to send first capability information indicating that a frequency modulation-amplitude modulation FM-AM receiver structure or an orthogonal delay receiver structure is supported; and/or indicating support for multicarrier-based FM-AM FSK modulation.

In a possible implementation manner, the transceiver unit 802 is further configured to receive at least one of the following information: information indicating a frequency domain location of the first bandwidth; or, information indicating a frequency domain location of the second bandwidth; or, information indicating a subcarrier spacing; or, information indicating the number of subcarriers of the first bandwidth; or information indicating the number of subcarriers of the second bandwidth, or information indicating a first threshold (i.e., a hard decision or demodulation threshold for receiver incoherent demodulation).

In one possible implementation, the magnitude of the delay parameter τ used to demodulate the first signal is less than the duration of 1 OFDM symbol.

It should be noted that, for details of the information execution process of the unit of the communication device 800, reference may be made to the description in the foregoing embodiment of the method of the present application, and details are not repeated here.

Referring to fig. 9, a schematic structural diagram of a communication device according to the foregoing embodiment of the present application is provided, where the communication device may specifically be a network device according to the foregoing embodiment, and the structure of the communication device may refer to the structure shown in fig. 9.

The communication device includes at least one processor 911, at least one memory 912, at least one transceiver 913, and one or more antennas 914. The processor 911, memory 912 and transceiver 913 are coupled, for example, by a bus, and in embodiments of the present application, the connection may include various interfaces, transmission lines or buses, etc., which are not limited in this embodiment. An antenna 914 is coupled to the transceiver 913.

As an implementation example, in the case that the communication apparatus shown in fig. 9 is the first device in the foregoing fig. 3 and related embodiments, the processor 911 is configured to generate a first signal, where the first signal is an OFDM signal in the time domain and occupies a first bandwidth and a second bandwidth in the frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the transceiver 913 is configured to transmit the first signal.

It should be noted that, the execution process of each device in the communication apparatus shown in fig. 9 and the like may be specifically referred to the description in the foregoing embodiment of the method shown in the present application, and will not be repeated here.

The processor 911 is mainly used for processing communication protocols and communication data, and controlling the whole communication device, executing software programs, processing data of the software programs, for example for supporting the communication device to perform the actions described in the embodiments. The communication device may include a baseband processor, which is mainly used for processing the communication protocol and the communication data, and a central processor, which is mainly used for controlling the entire network device, executing the software program, and processing the data of the software program. The processor 911 in fig. 9 may integrate the functions of a baseband processor and a central processor, and those skilled in the art will appreciate that the baseband processor and the central processor may also be separate processors, interconnected by bus technology, etc. Those skilled in the art will appreciate that the network device may include multiple baseband processors to accommodate different network formats, and that the network device may include multiple central processors to enhance its processing capabilities, and that the various components of the network device may be connected by various buses. The baseband processor may also be referred to as a baseband processing circuit or baseband processing chip. The central processing unit may also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in a memory in the form of a software program, which is executed by the processor to realize the baseband processing function.

The memory is mainly used for storing software programs and data. The memory 912 may be separate and coupled to the processor 911. Alternatively, the memory 912 may be integrated with the processor 911, for example, within a single chip. The memory 912 is capable of storing program codes for implementing the technical solution of the embodiment of the present application, and the execution is controlled by the processor 911, and various types of computer program codes executed may be regarded as drivers of the processor 911.

Fig. 9 shows only one memory and one processor. In an actual network device, there may be multiple processors and multiple memories. The memory may also be referred to as a storage medium or storage device, etc. The memory may be a memory element on the same chip as the processor, i.e., an on-chip memory element, or a separate memory element, as embodiments of the present application are not limited in this respect.

A transceiver 913 may be used to support the reception or transmission of radio frequency signals between the communication device and the terminal, and the transceiver 913 may be connected to the antenna 914. The transceiver 913 includes a transmitter Tx and a receiver Rx. Specifically, the one or more antennas 914 may receive radio frequency signals, and the receiver Rx of the transceiver 913 is configured to receive the radio frequency signals from the antennas and convert the radio frequency signals into digital baseband signals or digital intermediate frequency signals, and provide the digital baseband signals or digital intermediate frequency signals to the processor 911, so that the processor 911 performs further processing, such as demodulation processing and decoding processing, on the digital baseband signals or digital intermediate frequency signals. The transmitter Tx in the transceiver 913 is also operative to receive and convert modulated digital baseband signals or digital intermediate frequency signals from the processor 911 to radio frequency signals, and to transmit the radio frequency signals via the one or more antennas 914. In particular, the receiver Rx may selectively perform one or more steps of down-mixing and analog-to-digital conversion on the radio frequency signal to obtain a digital baseband signal or a digital intermediate frequency signal, where the order of the down-mixing and analog-to-digital conversion is adjustable. The transmitter Tx may selectively perform one or more stages of up-mixing processing and digital-to-analog conversion processing on the modulated digital baseband signal or the digital intermediate frequency signal to obtain a radio frequency signal, and the sequence of the up-mixing processing and the digital-to-analog conversion processing may be adjustable. The digital baseband signal and the digital intermediate frequency signal may be collectively referred to as a digital signal.

The transceiver may also be referred to as a transceiver unit, transceiver device, etc. Alternatively, the device for implementing the receiving function in the transceiver unit may be regarded as a receiving unit, and the device for implementing the transmitting function in the transceiver unit may be regarded as a transmitting unit, that is, the transceiver unit includes a receiving unit and a transmitting unit, where the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, or a transmitting circuit, etc.

It should be noted that, the communication apparatus shown in fig. 9 may be specifically used to implement the steps implemented by the network device in any of the foregoing method embodiments, and implement the technical effects corresponding to the network device, and the specific implementation manner of the communication apparatus shown in fig. 9 may refer to the descriptions in any of the foregoing method embodiments, which are not repeated herein.

Referring to fig. 10, a schematic diagram of a possible logic structure of a communication device 1000 according to the foregoing embodiment of the present application is provided, where the communication device may specifically be a terminal device according to the foregoing embodiment, and the communication device 1000 may include, but is not limited to, a processor 1001, a communication port 1002, a memory 1003, and a bus 1004, and in the embodiment of the present application, the processor 1001 is configured to perform control processing on an action of the communication device 1000.

As an implementation example, in the case where the communication apparatus shown in fig. 10 is the first device in the foregoing fig. 3 and related embodiments, the processor 1001 is configured to generate a first signal, where the first signal is an OFDM signal in a time domain, and the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the communication port 1002 is for transmitting the first signal.

As another implementation example, in the case where the communication apparatus shown in fig. 10 is the second device in the foregoing fig. 3 and related embodiments, the communication port 1002 is configured to receive a first signal, where the first signal is an OFDM signal in the time domain and occupies a first bandwidth and a second bandwidth in the frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both greater than 1; wherein the first bandwidth and the second bandwidth are used for bearing frequency shift keying FSK modulation symbols; the processor 1001 is configured to demodulate the FSK modulated symbols based on the first signal.

Further, the processor 1001 may be a central processor unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so forth. It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

It should be noted that, the communication apparatus shown in fig. 10 may be specifically used to implement steps implemented by the terminal device (e.g., the first device or the second device) in any of the foregoing method embodiments, and implement technical effects corresponding to the terminal device, and the specific implementation manner of the communication apparatus shown in fig. 10 may refer to the description in any of the foregoing method embodiments, which is not repeated herein.

Embodiments of the present application also provide a computer-readable storage medium storing one or more computer-executable instructions, which when executed by a processor, perform a method as described in a possible implementation of the communication apparatus in the foregoing embodiment, where the communication apparatus may specifically be the first device or the second device in the foregoing embodiment.

Embodiments of the present application also provide a computer program product (or computer program) storing one or more computers, which when executed by the processor performs a method of a possible implementation of the communication apparatus, where the communication apparatus may specifically be the first device or the second device in the foregoing embodiments.

The embodiment of the application also provides a chip system which comprises a processor and is used for supporting the communication device to realize the functions related to the possible realization mode of the communication device. In one possible design, the system-on-chip may further include a memory to hold the necessary program instructions and data for the communication device. The chip system may be formed by a chip, or may include a chip and other discrete devices, where the communication apparatus may specifically be the first device or the second device in the foregoing embodiments.

The embodiment of the application also provides a communication system, which comprises the communication device, and the communication device can be specifically the first equipment and the second equipment in any one of the previous embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, a substantial portion of the technical solution of the present application, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A method of communication, comprising:

generating a first signal, wherein the first signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both larger than 1; the first bandwidth and the second bandwidth are used for bearing Frequency Shift Keying (FSK) modulation symbols;

and transmitting the first signal.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

The first bandwidth carrying a sequence determined by first information bits and the second bandwidth carrying a sequence determined by second information bits or the second bandwidth being zero power,

Or alternatively, the first and second heat exchangers may be,

The first bandwidth carries a sequence determined by second information bits or the first bandwidth is zero power and the second bandwidth carries a sequence determined by first information bits.

3. A method according to claim 1 or 2, characterized in that,

The first bandwidth is adjacent to the second bandwidth in the frequency domain.

4. A method according to claim 1 or 2, characterized in that,

The first bandwidth and the second bandwidth are separated by at least one subcarrier in a frequency domain, wherein the at least one subcarrier does not carry information or the at least one subcarrier is zero power.

5. The method of any of claims 1 to 4, wherein the first signal is one of an I-way signal, a Q-way signal, a real-part signal, or an imaginary-part signal of an OFDM signal.

6. The method of claim 5, wherein when the device type of the signal receiving side of the first signal is an FM-AM receiver or an orthogonal delay receiver, the first signal is one of an I-channel signal, a Q-channel signal, a real-part signal, or an imaginary-part signal of the OFDM signal.

7. The method according to any one of claims 1 to 6, further comprising:

Transmitting indication information indicating a first threshold, where the first threshold is used for demodulating the first signal, and the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, the number of OFDM subcarriers occupied by the first bandwidth, a subcarrier interval of the first bandwidth, the number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier interval of the second bandwidth.

8. The method of claim 7, wherein the first threshold satisfies:

Wherein f ₁ denotes the first center frequency point, f ₂ denotes the second center frequency point, d (f ₁) denotes a receiving function of the signal transmitted by the first bandwidth, d (f ₂) denotes a receiving function of the signal transmitted by the second bandwidth, min { d (f ₁),d(f₂) } denotes taking the minimum value of d (f ₁) and d (f ₂), and |d (f ₁)-d(f₂) | denotes taking the modulus of the difference between d (f ₁) and d (f ₂).

9. The method according to any of claims 1 to 8, wherein the first center frequency point of the first bandwidth and the second center frequency point of the second bandwidth satisfy at least one of:

2n (f ₁-f₂)＝(2k+1)f_s; or,

2Nf ₁＝lf_s; or alternatively, the first and second heat exchangers may be,

2Nf ₁＝mf_s; or alternatively, the first and second heat exchangers may be,

(N_SCS+1)ΔFn＝pf_s；

10. The method according to any one of claims 1 to 9, further comprising:

receiving first capability information indicating support of a frequency modulation-amplitude modulation, FM-AM, receiver structure or a quadrature delay receiver structure; and/or indicating support for multicarrier-based FM-AM FSK modulation.

11. The method according to any one of claims 1 to 10, further comprising:

Transmitting at least one of the following information: information indicating a frequency domain location of the first bandwidth; or, information indicating a frequency domain location of the second bandwidth; or, information indicating a subcarrier spacing; or, information indicating the number of subcarriers of the first bandwidth; or, information indicating the number of subcarriers of the second bandwidth.

12. A method of communication, comprising:

Receiving a first signal, wherein the first signal is an Orthogonal Frequency Division Multiplexing (OFDM) signal in a time domain, the first signal occupies a first bandwidth and a second bandwidth in a frequency domain, and the number of subcarriers of the first bandwidth and the number of subcarriers of the second bandwidth are both larger than 1; the first bandwidth and the second bandwidth are used for bearing Frequency Shift Keying (FSK) modulation symbols;

Demodulating the FSK modulated symbol based on the first signal.

13. The method of claim 12, wherein the first bandwidth carries a sequence determined by first information bits and the second bandwidth carries a sequence determined by second information bits or the second band is zero power;

Or alternatively, the first and second heat exchangers may be,

14. The method according to claim 12 or 13, wherein,

15. The method according to claim 12 or 13, wherein,

16. The method according to any of claims 12 to 15, wherein the first signal is one of an I-way signal, a Q-way signal, a real-part signal or an imaginary-part signal of an OFDM signal.

17. The method of claim 16, wherein when the device type of the signal receiving side of the first signal is an FM-AM receiver or an orthogonal delay receiver, the first signal is one of an I-channel signal, a Q-channel signal, a real-part signal, or an imaginary-part signal of the OFDM signal.

18. The method according to any one of claims 12 to 17, wherein said demodulating the FSK modulation symbols based on the first signal comprises:

Demodulating the FSK modulation symbol based on the first signal and a first threshold, wherein the first threshold is associated with at least one of a first center frequency point of the first bandwidth, a second center frequency point of the second bandwidth, a number of OFDM subcarriers occupied by the first bandwidth, a subcarrier spacing of the first bandwidth, a number of OFDM subcarriers occupied by the second bandwidth, and an OFDM subcarrier spacing of the second bandwidth.

19. The method of claim 18, wherein the first threshold satisfies:

20. The method according to claim 18 or 19, characterized in that the method further comprises:

and receiving indication information indicating the first threshold value.

21. The method according to any of claims 12 to 20, wherein the first center frequency point of the first bandwidth and the second center frequency point of the second bandwidth satisfy at least one of:

2n (f ₁-f₂)＝(2k+1)f_s; or,

2Nf ₁＝lf_s; or alternatively, the first and second heat exchangers may be,

2Nf ₁＝mf_s; or alternatively, the first and second heat exchangers may be,

(N_SCS+1)ΔFn＝pf_s；

22. The method according to any one of claims 12 to 21, further comprising:

Transmitting first capability information indicating support of a frequency modulation-amplitude modulation, FM-AM, receiver structure or a quadrature delay receiver structure; and/or indicating support for multicarrier-based FM-AM FSK modulation.

23. The method according to any one of claims 12 to 22, further comprising:

Receiving at least one of the following information: information indicating a frequency domain location of the first bandwidth; or, information indicating a frequency domain location of the second bandwidth; or, information indicating a subcarrier spacing; or, information indicating the number of subcarriers of the first bandwidth; or, information indicating the number of subcarriers of the second bandwidth.

24. The method according to any of the claims 12 to 23, characterized in that the magnitude of the delay parameter τ for demodulating the first signal is smaller than the duration of 1 OFDM symbol.

25. A communication device comprising means for performing the method of any of claims 1-11 or means for performing the method of any of claims 12-24.

26. A communication device comprising at least one processor, the at least one processor coupled to a memory;

the memory is used for storing programs or instructions;

The at least one processor is configured to execute the program or instructions to cause the apparatus to implement the method of any one of claims 1 to 11, or to cause the apparatus to implement the method of any one of claims 12 to 24.

27. A computer readable storage medium, characterized in that the medium stores instructions which, when executed by a computer, implement the method of any one of claims 1 to 24.

28. A computer program product, the computer program product comprising computer instructions; when part or all of the computer instructions are run on a computer, cause the method of any one of claims 1-11 to be performed or cause the method of any one of claims 12-24 to be performed.

29. A chip, wherein the chip comprises a processor and a communication interface;

Wherein the communication interface is coupled to the processor for running a computer program or instructions to implement the method of any one of claims 1 to 24.

30. A communication system comprising a first communication device and a second communication device;

wherein the first communication device is adapted to perform the method of any of claims 1 to 11 and the second communication device is adapted to perform the method of any of claims 12 to 24.