CN112152671B - MIMO power line carrier communication method and system - Google Patents
MIMO power line carrier communication method and system Download PDFInfo
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Abstract
本发明公开一种MIMO电力线载波通信方法及系统，方法包括：响应于获取的至少两路比特流，对至少两路比特流进行OFDM调制；将经由OFDM调制获得的至少两路输出信号进行不同频点的调节，使形成至少两路不同中心频点的载波数字信号；基于发送端与非法接收端之间的信道矩阵的零空间对至少两路不同中心频点的载波数字信号分别进行预编码处理，使形成至少两路传输信号，其中，仅有一路传输信号中包含真实信号，其他路传输信号中包含干扰信号；将一路传输信号以及其他路传输信号分别送入MIMO电力线中传输。通过发送多路不同频点的载波信号，将真实信号隐藏，并利用发送端与非法接收端之间的信道矩阵的零空间矩阵对发送信号做预编码处理，增强系统通信安全性。
The invention discloses a MIMO power line carrier communication method and system. The method includes: in response to the at least two bit streams obtained, performing OFDM modulation on the at least two bit streams; and performing different frequency modulation on the at least two output signals obtained through the OFDM modulation point adjustment, so that at least two channels of carrier digital signals with different center frequency points are formed; based on the null space of the channel matrix between the transmitting end and the illegal receiving end, the carrier digital signals of at least two channels of different center frequency points are pre-coded respectively. , so that at least two transmission signals are formed, of which only one transmission signal contains the real signal, and the other transmission signals contain interference signals; the one transmission signal and the other transmission signals are respectively sent to the MIMO power line for transmission. By sending multiple carrier signals of different frequencies, the real signal is hidden, and the null space matrix of the channel matrix between the sending end and the illegal receiving end is used to precode the sent signal to enhance the system communication security.
Description
Technical Field
The invention belongs to the technical field of power line carrier communication, and particularly relates to a MIMO power line carrier communication method and system.
Background
The traditional power line carrier communication uses a phase line and a neutral line as channels for signal transmission, which is a single-input single-output communication mode. Since the power line is originally designed to transmit electric energy rather than communication signals, the single-input single-output power line carrier communication has the problems of low transmission power and limited bandwidth, and brings difficulty to the realization of long-distance and high-speed power line carrier communication. The MIMO transmission technology can just effectively resist the random weakness of the power line channel, improve the communication speed and improve the communication quality.
In the MIMO power carrier communication system, since an eavesdropper can be connected to the system through a physical route as a legitimate user, information data may be stolen, that is, a problem of information leakage may occur, which brings a challenge to communication security.
Disclosure of Invention
Embodiments of the present invention provide a MIMO power line carrier communication method and system, which are used to solve at least one of the above technical problems.
In a first aspect, an embodiment of the present invention provides a MIMO power line carrier communication method, used at a sending end, including: responding to the obtained at least two bit streams, and performing OFDM modulation on the at least two bit streams; adjusting different frequency points of at least two paths of output signals obtained by OFDM modulation to form at least two paths of carrier digital signals with different central frequency points; precoding the at least two paths of carrier digital signals with different central frequency points respectively based on a null space of a channel matrix between a sending end and an illegal receiving end to form at least two paths of transmission signals, wherein only one path of transmission signals contains real signals, and other paths of transmission signals contain interference signals; and respectively sending the transmission signal and the other transmission signals into an MIMO power line for transmission.
In a second aspect, an embodiment of the present invention provides a MIMO power line carrier communication method, used for a legal receiving end, including: extracting the acquired transmission signals based on preset central frequency point information configuration to obtain carrier digital signals with real signals; and demodulating the carrier digital signal with the real signal to obtain the real signal.
In a third aspect, an embodiment of the present invention provides a MIMO power line carrier communication system, used at a sending end, including: the modulation module is configured to respond to the obtained at least two bit streams and carry out OFDM modulation on the at least two bit streams; the adjusting module is configured to adjust at least two paths of output signals obtained through OFDM modulation at different frequency points so as to form at least two paths of carrier digital signals at different central frequency points; the first pre-coding module is configured to pre-code the at least two paths of carrier digital signals with different central frequency points respectively based on a null space of a channel matrix between the sending end and the illegal receiving end, so that at least two paths of transmission signals are formed, wherein only one path of transmission signal contains a real signal, and the other paths of transmission signals contain interference signals; and the transmission module is configured to send the transmission signal and the other transmission signals to the MIMO power line for transmission.
In a fourth aspect, an embodiment of the present invention provides a MIMO power line carrier communication system, which is used for a legal receiving end, and includes: the extraction module is configured to extract the acquired transmission signals based on preset central frequency point information configuration so as to obtain carrier digital signals with real signals; and the demodulating module is configured to demodulate the carrier digital signal with the real signal so as to obtain the real signal.
In a fifth aspect, an electronic device is provided, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the MIMO power line carrier communication method of any of the embodiments of the present invention.
In a sixth aspect, the present invention also provides a computer program product, where the computer program product includes a computer program stored on a non-volatile computer-readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes the steps of the MIMO power line carrier communication method according to any one of the embodiments of the present invention.
The method and the system have the following beneficial effects:
1. in MIMO power line carrier communication, a plurality of paths of carrier signals with different frequency points are sent, real signals are hidden, and further, a zero space matrix of a channel matrix between a sending end and an illegal receiving end is utilized to perform precoding processing on the sent signals, so that the communication safety of the system is enhanced.
2. Aiming at the condition of multipath reception and performance enhancement of an illegal receiving end, except that a real signal is hidden in a frequency domain, interference noise of multipath and the same frequency point of the real signal is introduced, and meanwhile, the zero space matrix of a channel matrix between a transmitting end and a legal receiving end is utilized to perform precoding processing on the interference noise, so that the influence on a legal user is eliminated, the interference of the noise on the illegal receiving end is only reserved, and the safety of system communication is further enhanced.
In summary, through the joint design of the space frequency domain, the MIMO power line carrier communication security is enhanced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a MIMO power line carrier communication method according to an embodiment of the present invention;
fig. 2 is a flowchart of another MIMO power line carrier communication method according to an embodiment of the present invention;
fig. 3 is a flowchart of a further MIMO power line carrier communication method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an embodiment of a MIMO power line carrier communication method according to the present invention;
fig. 5 is a schematic diagram of a MIMO power line carrier communication method according to another embodiment of the present invention; (ii) a
Fig. 6 is a block diagram of a MIMO power line carrier communication system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of an embodiment of a MIMO power line carrier communication method according to the present application is shown, where the MIMO power line carrier communication method is used at a transmitting end.
As shown in fig. 1, in step 101, in response to the obtained at least two bit streams, OFDM modulating the at least two bit streams;
in step 102, at least two paths of output signals obtained by OFDM modulation are subjected to different frequency point adjustment, so that at least two paths of carrier digital signals with different central frequency points are formed;
in step 103, precoding the at least two paths of carrier digital signals with different center frequency points based on a null space of a channel matrix between the transmitting end and the illegal receiving end to form at least two paths of transmission signals, wherein only one path of transmission signal contains a real signal, and the other paths of transmission signals contain interference signals;
in step 104, the one transmission signal and the other transmission signals are respectively sent to a MIMO power line for transmission.
In this embodiment, for step 101, the MIMO power line carrier communication system performs OFDM modulation on the at least two bit streams in response to the obtained at least two bit streams. Then, for step 102, the MIMO power line carrier communication system adjusts at least two output signals obtained through OFDM modulation at different frequency points, so as to form at least two carrier digital signals at different central frequency points. Then, in step 103, the MIMO power line carrier communication system performs precoding processing on the at least two paths of carrier digital signals with different central frequency points based on a null space of a channel matrix between the transmitting end and the non-legal receiving end, so as to form at least two paths of transmission signals, where only one path of transmission signal includes a real signal, and the other paths of transmission signals include an interference signal. And then, the MIMO power line carrier communication system sends the transmission signal and the other transmission signals to the MIMO power line for transmission.
In the scheme provided by the embodiment, in the MIMO power line carrier communication, the real signals are hidden by sending a plurality of paths of carrier signals with different frequency points, and further, the zero space matrix of the channel matrix between the sending end and the illegal receiving end is used for performing precoding processing on the sent signals, so that the communication safety of the system is enhanced.
In some optional embodiments, the processing procedure of the precoding processing in the above method may be:
suppose three carrier digital signals are X1，X2，X3The channel matrix between the transmitting device and the illegal receiving end is He，HeHas a null-space matrix of HzeroIn which H ise×HzeroWhen the carrier digital signal after precoding is 0, the carrier digital signal can be represented as Hzero×[X1X2 X3]TTherein []TIndicating that the transpose process is performed on the matrix.
Please refer to fig. 2, which shows a flowchart of a MIMO power line carrier communication method according to another embodiment of the present application.
As shown in fig. 2, in step 201, the at least two paths of carrier digital signals with different center frequency points are superimposed to form an integrated transmission signal, where the first input signal includes a real signal and at least one interference signal;
in step 202, in response to the obtained at least one channel of bit stream, performing OFDM modulation on the at least one channel of bit stream;
in step 203, performing frequency point adjustment on at least one output signal obtained through OFDM modulation to form at least one carrier digital signal, where a center frequency point of the at least one carrier digital signal is the same as a center frequency point of a real signal;
in step 204, pre-coding the at least one channel of carrier digital signals based on a null space of a channel matrix between a transmitting end and a legal receiving end to form at least one channel of transmission signals, wherein the at least one channel of transmission signals includes an interference signal;
in step 205, the integrated transmission signal and the at least one transmission signal are respectively transmitted to a MIMO power line for transmission.
In this embodiment, for step 201, the MIMO power line carrier communication system superimposes the at least two paths of carrier digital signals with different central frequency points to form an integrated transmission signal, where the first input signal includes a real signal and at least one interference signal. Then, for step 202, the MIMO power line carrier communication system performs OFDM modulation on at least one bit stream in response to the obtained at least one bit stream. Then, for step 203, the MIMO power line carrier communication system performs frequency point adjustment on at least one output signal obtained through OFDM modulation to form at least one carrier digital signal, where a center frequency point of the at least one carrier digital signal is the same as a center frequency point of a real signal. Then, in step 204, the MIMO power line carrier communication system performs precoding processing on the at least one channel of carrier digital signals based on a null space of a channel matrix between the transmitting end and the legal receiving end, so as to form at least one channel of transmission signals, where the at least one channel of transmission signals includes an interference signal. Then, for step 205, the integrated transmission signal and the at least one transmission signal are respectively sent to a MIMO power line for transmission.
According to the scheme of the embodiment, aiming at the condition of multipath receiving and performance enhancement of an illegal receiving end, except that a real signal is hidden in a frequency domain, interference noise of multipath and the same frequency point of the real signal is introduced, and meanwhile, precoding processing is carried out on the interference noise by utilizing a zero space matrix of a channel matrix between a transmitting end and a legal receiving end, so that the influence on a legal user is eliminated, the interference of the noise on the illegal receiving end is only reserved, and the safety of system communication is further enhanced.
In some optional embodiments, the processing procedure of the precoding processing in the above method may be:
suppose three carrier digital signals are X1，X2，X3The channel matrix between the sending end and the legal receiving end is Hg，HgHas a null-space matrix of HzgroIn which H isg×HzgroWhen the carrier digital signal after precoding is 0, the carrier digital signal can be represented as Hzgro×[X1 X2X3]TTherein []TIndicating that the transpose process is performed on the matrix.
Please refer to fig. 3, which shows a flowchart of a MIMO power line carrier communication method according to another embodiment of the present application, the MIMO power line carrier communication method is applied to a legal receiving end.
As shown in fig. 3, in step 301, extracting the acquired transmission signal based on the preset central frequency point information configuration so as to obtain a carrier digital signal with a real signal;
in step 302, the carrier digital signal with the real signal is demodulated to obtain the real signal.
In this embodiment, for step 301, the MIMO power line carrier communication system extracts the acquired transmission signal based on the preset central frequency point information configuration, so as to obtain a carrier digital signal with a real signal. Then, for step 302, the MIMO power line carrier communication system demodulates the carrier digital signal with the real signal, so as to obtain the real signal.
According to the scheme of the embodiment, the acquired transmission signals are extracted by adopting the configuration of the central frequency point information preset in the legal receiving end, so that the legal receiving end can directly acquire real signals, and the communication safety is effectively improved on the premise of ensuring the communication speed.
It should be noted that the above method steps are not intended to limit the execution order of the steps, and in fact, some steps may be executed simultaneously or in the reverse order of the steps, which is not limited herein.
The following description is provided to enable those skilled in the art to better understand the present disclosure by describing some of the problems encountered by the inventors in implementing the present disclosure and by describing one particular embodiment of the finally identified solution.
The inventor finds that the defects in the prior art are mainly caused by the following reasons in the process of implementing the application: an eavesdropper can connect to the system through a physical route, as can a legitimate user.
The scheme of the application is designed and optimized mainly from the following aspects to improve the safety of MIMO (Multiple-Input Multiple-output) power line communication:
the MIMO-based space frequency domain power line carrier secure communication joint design comprises a transmitting device and a receiving device, wherein the transmitting device and the receiving device are connected through a power line.
The transmission apparatus includes:
an OFDM modulator: and acquiring an input signal, and performing orthogonal frequency division multiplexing modulation on the signal.
Digital front end: and acquiring the signal generated by the OFDM modulation unit to form a carrier digital signal. The center frequency of the signal can be adjusted by configuring the center frequency of the internal mixer.
Precoder: and acquiring the signal regulated by the digital front end, and performing precoding processing on the signal by using a zero space matrix of a channel matrix.
A coupler: and acquiring the signal regulated by the precoder, and injecting a carrier signal into a power line for transmission.
The receiving apparatus includes:
a coupler: for coupling out a carrier signal from the power line.
Digital front end: acquiring signals output by the coupler, and detecting and filtering digital signals of a specific central frequency point;
an OFDM demodulation unit: and acquiring the signal acquired by the digital front end, and performing orthogonal frequency division multiplexing demodulation on the signal.
The transmitting device and the receiving device are connected through a MIMO channel composed of a multi-conductor power line.
The data transfer process is as follows: at a transmitting end, a signal is sent to an OFDM modulation unit to form a data frame, and data is transformed from a frequency domain to a time domain through IFFT (Inverse Fast Fourier Transform) in the process; then sending the data to a digital front end of a transmitter, and adjusting the central frequency point of the signal in the digital front end by the data to obtain a carrier digital signal; then, the carrier digital signal is sent to a precoder, and data is precoded in the precoder by using a zero space matrix of a channel matrix; finally, the carrier digital signals after precoding are sent to a PLC (Power Line Communication ) MIMO channel through a coupler for transmission; at the receiving end, the signal transmitted by the power line is demodulated by the digital front end after passing through the coupler, and then the initial input signal of the transmitter is obtained after passing through the OFDM demodulation unit.
The first improvement scheme is as follows: in a power line communication scene, sending equipment simultaneously sends three paths of carrier digital signals through a multi-conductor power line, receiving equipment receives the signals in a single path, and a 3 x 1MIMO communication link is formed between the sending equipment and the receiving equipment; assuming that an eavesdropper is connected to the transmitting device via the power line, receiving one way, a 3 x 1MIMO communication link is also formed with the transmitting device. In order to enhance the security, firstly, the transmitter transmits the real signal in one path and transmits the real signal in the other two pathsSending a false signal. And forming three paths of signals into three paths of carrier digital signals with different central frequency points by utilizing the characteristic of the central frequency point of the digital front-end adjusting signal. Legal receiving equipment utilizes the known central frequency point information in advance to configure the digital front end of the receiver, and real signals are extracted from false signals. The eavesdropper is difficult to extract and obtain a real signal because the eavesdropper does not know the specific frequency point information; secondly, because the condition of the power line channel is basically unchanged, the transmitting equipment can utilize the zero-space matrix of the channel matrix between the transmitting equipment and the eavesdropper to perform precoding processing on the three paths of carrier digital signals, so that the eavesdropping resistance is improved, and the communication safety is enhanced. The pre-coding process is as follows: suppose three carrier digital signals are X1，X2，X3The channel matrix between the transmitting device and the eavesdropper is Hg,HgHas a null-space matrix of HzgroIn which H isg×HzgroWhen the carrier digital signal after precoding is 0, the carrier digital signal can be represented as Hzgro×[X1 X2 X3]TTherein []TIndicating that the transpose process is performed on the matrix.
The second improvement scheme is as follows: in the power line communication scenario, it is assumed that a 3 × 1MIMO communication link is still formed between the transmitting device and the receiving device, but the eavesdropper becomes 3 paths of reception, that is, a 3 × 3MIMO communication link is formed between the transmitting device and the eavesdropper at this time, so that the eavesdropper performance is enhanced. Aiming at the situation, on the basis of the scheme I, the following improvements are made: firstly, adding same-frequency point interference noise signals, specifically, superposing three paths of carrier digital signals with different frequency points in the first scheme into one path of carrier digital signal, and then adding two paths of false signals, wherein the false signals are adjusted to the central frequency point of a real signal through a digital front end. At the moment, the transmitter transmits three paths of carrier signals with the same central frequency point in the MIMO power line; secondly, in order to eliminate the influence of the two paths of interference signals on legal receiving equipment, precoding is carried out on the two paths of same-frequency point interference carrier signals before the two paths of same-frequency point interference carrier signals are sent to a power line. Different from the first scheme, the zero space of the channel matrix between the sending equipment and the legal receiving equipment is used for precoding; and the precoding processing of the first path of real signals is not needed.
Please refer to fig. 4, which illustrates a schematic diagram of an embodiment of a MIMO power line carrier communication method according to an embodiment of the present application.
As shown in fig. 4, the scheme of the present embodiment mainly includes the following steps:
1) and at the transmitting end, the three bit streams are simultaneously sent to an OFDM modulator for OFDM modulation, and the data are converted to the time domain from the frequency domain. Wherein, the first path of the three paths of bit streams is a real signal, and the other two paths of bit streams are used as interference noise.
2) And three paths of output of the OFDM modulator are sent to a digital front end, so that the real signals and the interference noise are adjusted to different frequency points. The center frequency point of the first path of digital front end through which the real signal passes is set to be 80MHz, and the frequency points of the other path of digital front end through which the noise passes are respectively set to be 70MHz and 90 MHz.
3) And sending the output data of the digital front end to a precoder. The precoder performs precoding processing on data by using a zero-space matrix of a channel matrix between the transmitter and the eavesdropping equipment, so that the eavesdropping resistance of the system is enhanced.
4) And the three paths of output signals of the precoder are sent to the MIMO power line through the coupler for transmission.
5) And the legal receiver and the eavesdropping device are used for receiving in a single path, and form a 3 x 1MIMO communication link with the transmitter.
6) And the legal receiver acquires a signal from the MIMO power line by using the coupler, and sequentially passes the signal through the digital front end and the OFDM modulator, so that the real signal sent by the transmitter is extracted finally. The digital front-end frequency point is set to be 80MHz, so that interference noise at 70MHz and 90MHz can be filtered, and real signals can be extracted.
7) And the eavesdropping equipment is not set at the frequency point of the real signal because the frequency point of the real signal is unknown, and the frequency point of the digital front end of the eavesdropping equipment is set at 70-90 MHz, so that the real signal cannot be demodulated out under the influence of noise interference. Further, if the eavesdropping device happens to set the digital front-end frequency point to 80MHz, the eavesdropping device still has difficulty in acquiring a real signal because the sending data is precoded by using the channel information between the sending end and the eavesdropping device.
Please refer to fig. 5, which shows a schematic diagram of a MIMO power line carrier communication method according to another embodiment of the present application.
As shown in fig. 5, the scheme of the present embodiment mainly includes the following steps:
1) and at the transmitting end, the three bit streams are simultaneously sent to an OFDM modulator for OFDM modulation, and the data are converted to the time domain from the frequency domain. Wherein, the first path of the three paths of bit streams is a real signal, and the other two paths of bit streams are used as interference noise.
2) And three paths of output of the OFDM modulator are sent to a digital front end, so that the real signals and the interference noise are adjusted to different frequency points. The center frequency point of the first path of digital front end through which the real signal passes is set to be 80MHz, and the frequency points of the other path of digital front end through which the noise passes are respectively set to be 70MHz and 90 MHz.
3) And the three paths of carrier signals with different frequency points are sent into a coupler after time domain superposition and used as the first path input of the MIMO power line.
4) And the other two paths of interference noise are sequentially sent to the OFDM modulator and the digital front end. The digital front-end frequency point is set to be 80MHz, so that the interference noise is adjusted to the frequency point where the signal is located. And (4) sending the output of the digital front end into a precoder, and precoding two paths of interference noise. And the output of the precoder is sent to the coupler to be used as the second path and the third path of input of the MIMO power line.
5) And precoding by using the channel information between the transmitter and the legal receiver, thereby eliminating the influence of the two paths of interference noise on the legal receiver.
6) And the legal receiver acquires a signal from the MIMO power line by using the coupler, and sequentially passes the signal through the digital front end and the OFDM modulator, so that the real signal sent by the transmitter is extracted finally. The digital front-end frequency point is set to be 80MHz, so that interference noise at 70MHz and 90MHz can be filtered, and real signals can be extracted.
7) And the eavesdropping device receives the signals in three ways and forms a 3X 3MIMO communication link with the transmitter. The digital front-end frequency point is set to be 70-90 MHz. Although the performance of the eavesdropping device is enhanced, the eavesdropping device still has difficulty in acquiring a real signal because two paths of same frequency point interference noise are added.
Referring to fig. 6, a block diagram of a MIMO power line carrier communication system according to an embodiment of the present invention is shown.
As shown in fig. 6, the MIMO power line carrier communication system 400 includes a modulation module 410, a regulation module 420, a first precoding module 430, a transmission module 440, an extraction module 450, and a demodulation module 460.
The modulation module 410 is configured to perform OFDM modulation on the at least two bit streams in response to the obtained at least two bit streams; the adjusting module 420 is configured to adjust at least two output signals obtained through OFDM modulation at different frequency points, so as to form at least two carrier digital signals at different central frequency points; the first precoding module 430 is configured to perform precoding processing on the at least two paths of carrier digital signals with different center frequency points respectively based on a null space of a channel matrix between a transmitting end and an illegal receiving end, so as to form at least two paths of transmission signals, wherein only one path of transmission signal includes a real signal, and the other paths of transmission signals include interference signals; the transmission module 440 is configured to send the one transmission signal and the other transmission signals to a MIMO power line for transmission; an extracting module 450, configured to extract the acquired transmission signal based on a preset central frequency point information configuration, so as to obtain a carrier digital signal with a real signal; the demodulating module 460 is configured to demodulate the carrier digital signal with the real signal, so as to obtain the real signal.
It should be understood that the modules recited in fig. 6 correspond to various steps in the methods described with reference to fig. 1, 2, and 3. Thus, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in fig. 6, and are not described again here.
In other embodiments, an embodiment of the present invention further provides a non-volatile computer storage medium, where the computer storage medium stores computer-executable instructions, where the computer-executable instructions may execute the MIMO power line carrier communication method in any of the above method embodiments;
as one embodiment, a non-volatile computer storage medium of the present invention stores computer-executable instructions configured to:
responding to the obtained at least two bit streams, and performing OFDM modulation on the at least two bit streams;
adjusting different frequency points of at least two paths of output signals obtained by OFDM modulation to form at least two paths of carrier digital signals with different central frequency points;
precoding the at least two paths of carrier digital signals with different central frequency points respectively based on a null space of a channel matrix between a sending end and an illegal receiving end to form at least two paths of transmission signals, wherein only one path of transmission signals contains real signals, and other paths of transmission signals contain interference signals;
and respectively sending the transmission signal and the other transmission signals into an MIMO power line for transmission.
As yet another embodiment, the non-volatile computer storage medium of the present invention stores computer-executable instructions configured to:
extracting the acquired transmission signals based on preset central frequency point information configuration to obtain carrier digital signals with real signals;
and demodulating the carrier digital signal with the real signal to obtain the real signal.
The non-volatile computer-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the MIMO power line carrier communication system, and the like. Further, the non-volatile computer-readable storage medium may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the non-transitory computer readable storage medium optionally includes memory remotely located from the processor, and these remote memories may be connected to the MIMO power line carrier communication system over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Embodiments of the present invention also provide a computer program product, where the computer program product includes a computer program stored on a non-volatile computer-readable storage medium, and the computer program includes program instructions, which, when executed by a computer, cause the computer to execute any one of the MIMO power line carrier communication methods described above.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 7, the electronic device includes: one or more processors 510 and memory 520, with one processor 510 being an example in fig. 7. The apparatus of the MIMO power line carrier communication method may further include: an input device 530 and an output device 540. The processor 510, the memory 520, the input device 530, and the output device 540 may be connected by a bus or other means, and fig. 7 illustrates an example of a connection by a bus. The memory 520 is a non-volatile computer-readable storage medium as described above. The processor 510 executes various functional applications and data processing of the server by executing nonvolatile software programs, instructions and modules stored in the memory 520, namely, implements the MIMO power line carrier communication method of the above-described method embodiment. The input device 530 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the MIMO power line carrier communication system. The output device 540 may include a display device such as a display screen.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
As an embodiment, the electronic device is applied to a MIMO power line carrier communication system, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
responding to the obtained at least two bit streams, and performing OFDM modulation on the at least two bit streams;
adjusting different frequency points of at least two paths of output signals obtained by OFDM modulation to form at least two paths of carrier digital signals with different central frequency points;
precoding the at least two paths of carrier digital signals with different central frequency points respectively based on a null space of a channel matrix between a sending end and an illegal receiving end to form at least two paths of transmission signals, wherein only one path of transmission signals contains real signals, and other paths of transmission signals contain interference signals;
and respectively sending the transmission signal and the other transmission signals into an MIMO power line for transmission.
As another embodiment, the electronic device is applied to a MIMO power line carrier communication system, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
extracting the acquired transmission signals based on preset central frequency point information configuration to obtain carrier digital signals with real signals;
and demodulating the carrier digital signal with the real signal to obtain the real signal.
The electronic device of the embodiments of the present application exists in various forms, including but not limited to:
(1) a mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others.
(2) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as ipads.
(3) A portable entertainment device: such devices can display and play multimedia content. Such devices include audio and video players (e.g., ipods), handheld game consoles, electronic books, as well as smart toys and portable car navigation devices.
(4) The server is similar to a general computer architecture, but has higher requirements on processing capability, stability, reliability, safety, expandability, manageability and the like because of the need of providing highly reliable services.
(5) And other electronic devices with data interaction functions.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A MIMO power line carrier communication method is used for a sending end and is characterized by comprising the following steps:
responding to the obtained at least two bit streams, and performing OFDM modulation on the at least two bit streams;
adjusting different frequency points of at least two paths of output signals obtained by OFDM modulation to form at least two paths of carrier digital signals with different central frequency points;
superposing the at least two paths of carrier digital signals with different central frequency points to form an integrated transmission signal, wherein the integrated transmission signal comprises a real signal and at least one interference signal;
responding to at least one path of acquired bit stream, and carrying out OFDM modulation on the at least one path of bit stream;
carrying out frequency point adjustment on at least one path of output signals obtained through OFDM modulation to form at least one path of carrier digital signals, wherein the central frequency point of the at least one path of carrier digital signals is the same as the central frequency point of real signals;
pre-coding the at least one path of carrier digital signals based on a null space of a channel matrix between a sending end and a legal receiving end to form at least one path of transmission signals, wherein the at least one path of transmission signals comprises interference signals;
respectively sending the integrated transmission signal and the at least one transmission signal into an MIMO power line for transmission;
precoding the at least two paths of carrier digital signals with different central frequency points respectively based on a null space of a channel matrix between a sending end and an illegal receiving end to form at least two paths of transmission signals, wherein only one path of transmission signals contains real signals, and other paths of transmission signals contain interference signals;
and respectively sending the transmission signal and the other transmission signals into an MIMO power line for transmission.
2. The MIMO power line carrier communication method according to claim 1, wherein the process of performing precoding processing on the at least two paths of carrier digital signals with different center frequency points respectively based on a null space of a channel matrix between the transmitting end and the non-receiving end is as follows:
three paths of carrier digital signals are
，
，
The channel matrix between the transmitting device and the non-legitimate receiving end is
，
Has a null space matrix of
Wherein
The precoded carrier digital signal can be represented as
Wherein
Indicating that the transpose process is performed on the matrix.
3. The MIMO power line carrier communication method according to claim 1, wherein the process of performing precoding processing on the at least two paths of carrier digital signals with different center frequency points respectively based on a null space of a channel matrix between the transmitting end and the non-receiving end is as follows:
three paths of carrier digital signals are
，
，
The channel matrix between the sending end and the legal receiving end is
，
Has a null space matrix of
Wherein
The precoded carrier digital signal can be represented as
Wherein
Indicating that the transpose process is performed on the matrix.
4. A MIMO power line carrier communication system for a transmitting end, comprising:
the modulation module is configured to respond to the obtained at least two bit streams and carry out OFDM modulation on the at least two bit streams;
the adjusting module is configured to adjust at least two paths of output signals obtained through OFDM modulation at different frequency points so as to form at least two paths of carrier digital signals at different central frequency points;
superposing the at least two paths of carrier digital signals with different central frequency points to form an integrated transmission signal, wherein the integrated transmission signal comprises a real signal and at least one interference signal;
responding to at least one path of acquired bit stream, and carrying out OFDM modulation on the at least one path of bit stream;
carrying out frequency point adjustment on at least one path of output signals obtained through OFDM modulation to form at least one path of carrier digital signals, wherein the central frequency point of the at least one path of carrier digital signals is the same as the central frequency point of real signals;
pre-coding the at least one path of carrier digital signals based on a null space of a channel matrix between a sending end and a legal receiving end to form at least one path of transmission signals, wherein the at least one path of transmission signals comprises interference signals;
respectively sending the integrated transmission signal and the at least one transmission signal into an MIMO power line for transmission;
the first pre-coding module is configured to pre-code the at least two paths of carrier digital signals with different central frequency points respectively based on a null space of a channel matrix between the sending end and the illegal receiving end, so that at least two paths of transmission signals are formed, wherein only one path of transmission signal contains a real signal, and the other paths of transmission signals contain interference signals;
and the transmission module is configured to send the transmission signal and the other transmission signals to the MIMO power line for transmission.
5. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method of any of claims 1 to 3.
6. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
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