CN114500199A - Underwater acoustic communication method based on space-time cluster processing and related equipment - Google Patents
Underwater acoustic communication method based on space-time cluster processing and related equipment Download PDFInfo
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Abstract
The invention discloses an underwater acoustic communication method based on space-time cluster processing and related equipment, wherein the method comprises the following steps: mapping and pulse shaping filtering processing are carried out on a transmitting signal at a transmitting end to obtain a filtered baseband signal, modulation processing is carried out for the first time to obtain a modulation signal, and further, after secondary modulation is carried out to obtain a UWA signal, the UWA signal is sent to a UWA channel; and at a receiving end, the space-time processor array is utilized to carry out multi-path signal combination processing in each direction on the UWA signal, space-time clusters are extracted, and the transmitted signal is obtained after demodulation and pulse shaping filtering processing. The filtered baseband signals are modulated at the transmitting end through an OTFS modulation technology, UWA signals are processed at the receiving end through a space-time processor array to obtain space-time clusters, and finally, the transmitting signals are obtained through reduction.
Description
Technical Field
The present invention relates to the field of underwater acoustic communication technologies, and in particular, to an underwater acoustic communication method and related devices based on space-time cluster processing.
Background
The hydroacoustic channel is by far the most complex wireless channel, which has many transform properties of space-time-frequency; the conventional OFDM technology (Orthogonal frequency-division multiplexing) in underwater sound belongs to a high-speed underwater sound communication technology with Orthogonal carriers, but the Orthogonal carrier modulation technology has the common disadvantages that: the sensitivity to channel conditions and the sensitivity to doppler are seriously influenced by channels, the performance of the system is reduced if the doppler caused by the system motion is not compensated, and once the channel conditions are poor, the problem of high error rate is easily caused if the technology is not optimized or the communication performance is exchanged by the complexity, so that the communication quality is seriously influenced.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
The invention mainly aims to provide an underwater acoustic communication method based on space-time cluster processing and related equipment, and aims to solve the problems of system performance degradation and poor communication quality caused by channel sensitivity, serious influence by channels and Doppler sensitivity of carrier orthogonal technologies in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a space-time cluster processing-based underwater acoustic communication method comprises the following steps:
the transmitting end carries out mapping and pulse shaping filtering processing on the transmitting signal to obtain a filtered baseband signal;
the transmitting end carries out first modulation processing on the filtered baseband signal to obtain a modulation signal;
the transmitting end carries out secondary modulation on the modulation signal to obtain a UWA signal and sends the UWA signal to a UWA channel;
a receiving end receives the UWA signal by utilizing a space-time processor array, and extracts a space-time cluster after multi-path signal combination processing is carried out on the UWA signal in each direction;
and the receiving end demodulates and pulse shapes the space-time cluster, filters the space-time cluster, and restores the space-time cluster to obtain the transmitting signal.
In the underwater acoustic communication method based on the space-time cluster processing, the step of mapping and pulse shaping filtering the transmission signal by the transmitting end to obtain the filtered baseband signal specifically includes:
the transmitting terminal adopts a mapping modulation technology to map the transmitting signal to obtain a baseband signal;
and the transmitting end performs pulse shaping filtering processing on the baseband signal to obtain a filtered baseband signal.
In the underwater acoustic communication method based on the space-time cluster processing, the step of performing first modulation processing on the filtered baseband signal by the transmitting terminal to obtain a modulated signal specifically includes:
and the transmitting end carries out primary modulation processing on the filtered baseband signal by adopting an OTFS modulation technology to obtain the modulation signal.
In the underwater acoustic communication method based on the space-time cluster processing, the mapping modulation technology comprises BPSK modulation, QPSK modulation and QAM modulation.
In the underwater acoustic communication method based on the space-time cluster processing, the step of obtaining a UWA signal after the transmitting end performs the second modulation on the modulation signal, and sending the UWA signal to a UWA channel specifically includes:
and the transmitting end carries out carrier modulation processing on the modulation signal to obtain a UWA signal and sends the UWA signal to a UWA channel.
In the underwater acoustic communication method based on the space-time cluster processing, the UWA channel is an underwater acoustic channel.
In the underwater acoustic communication method based on the space-time cluster processing, the step of extracting the space-time cluster after the receiving end receives the UWA signal by using the space-time processor array and performs multi-path signal combination processing in each direction on the UWA signal specifically includes:
the receiving end receives the UWA signal transmitted in the UWA channel, and performs band-pass filtering processing on the UWA signal to obtain a filtered UWA signal;
the space-time processor array receives the filtered UWA signal, wherein the space-time processor array is composed of a plurality of space-time processors;
the space-time processor array extracts the peak value of the filtered UWA signal so as to estimate DOAs of all multi-paths in the UWA signal;
the space-time processor array forms beams in the direction of each DOA to obtain multi-path signals in the direction of each DOA;
and after the time delay of the multipath signals is estimated by the space-time processor array, extracting to obtain a plurality of space-time clusters.
In the underwater acoustic communication method based on the space-time cluster processing, the step of extracting a plurality of space-time clusters after the space-time processor array estimates the time delay of the multipath signal specifically comprises:
and the space-time processor array estimates the time delay of the multipath signal by using a matching tracking algorithm and extracts and obtains a plurality of space-time clusters which are grouped in the DOA direction and have information.
In the underwater acoustic communication method based on the space-time cluster processing, the step of restoring the transmitting signal after the receiving end demodulates and pulse shapes and filters the space-time cluster specifically includes:
the receiving end carries out carrier demodulation processing on the space-time cluster to obtain a first demodulation signal;
the receiving end adopts an OTFS demodulation technology to perform second demodulation processing on the first demodulation signal to obtain a second demodulation signal;
the receiving end carries out pulse shaping filtering processing on the second demodulation signal to obtain a baseband signal;
and the receiving end restores the baseband signal by adopting an encoding technology to obtain the transmitting signal.
In the underwater acoustic communication method based on the space-time cluster processing, the coding technology comprises Turbo code coding, convolutional code coding and LDPC code coding.
An underwater acoustic communication system based on space-time cluster processing, comprising: a transmitting end and a receiving end;
the transmitting terminal is used for mapping and pulse shaping filtering processing of a transmitting signal to obtain a filtered baseband signal, performing first modulation processing on the filtered baseband signal to obtain a modulation signal, performing second modulation on the modulation signal to obtain a UWA signal, and sending the UWA signal to a UWA channel;
and the receiving end is used for receiving the UWA signal by using the space-time processor array, extracting a space-time cluster after multi-path signal combination processing in each direction is carried out on the UWA signal, and restoring the space-time cluster after demodulation and pulse shaping filtering processing is carried out on the space-time cluster to obtain the transmitting signal.
In the underwater acoustic communication system based on the space-time cluster processing, the receiving end includes: the space-time processor array, wherein the space-time processor array is comprised of a plurality of space-time processors.
A computer readable storage medium storing a space-time cluster processing-based underwater acoustic communication program, which when executed by a processor implements the steps of the space-time cluster processing-based underwater acoustic communication method as described above.
Compared with the prior art, the underwater acoustic communication method based on the space-time cluster processing and the related equipment provided by the invention comprise the following steps: mapping and pulse shaping filtering processing are carried out on the transmitting signal at a transmitting end, and a filtered baseband signal is obtained; carrying out first modulation processing on the filtered baseband signal to obtain a modulation signal; and carrying out second modulation on the modulation signal to obtain a UWA signal, and sending the UWA signal to a UWA channel; performing band-pass filtering at a receiving end to filter out-of-band noise, extracting corresponding frequency band signals, and then performing multi-path signal combination processing on the UWA signals in each direction by using a space-time processor array to obtain space-time clusters; and after the space-time cluster is subjected to demodulation and pulse shaping filtering processing, restoring to obtain a transmitting signal. The filtered baseband signals are modulated at the transmitting end through an OTFS modulation technology, UWA signals are processed at the receiving end through a space-time processor array to obtain space-time clusters, and finally, the transmitting signals are obtained through reduction.
Drawings
Fig. 1 is a flowchart of a space-time cluster processing-based underwater acoustic communication method according to a preferred embodiment of the present invention;
fig. 2 is a flowchart of step S100 in the preferred embodiment of the underwater acoustic communication method based on space-time cluster processing according to the present invention;
fig. 3 is a flowchart of step S400 in the preferred embodiment of the underwater acoustic communication method based on space-time cluster processing according to the present invention;
FIG. 4 is a block diagram of a space-time processor provided by the present invention;
FIG. 5 is a diagram of a multipath signal model and system layout provided by the present invention;
FIG. 6 is a space-time distribution diagram of a multipath signal provided by the present invention;
FIG. 7 is a spatial spectrum corresponding to a simulated channel estimated by DOA provided by the present invention;
fig. 8 is a flowchart of step S500 in the preferred embodiment of the underwater acoustic communication method based on space-time cluster processing according to the present invention;
fig. 9 is a block diagram of a preferred embodiment of an underwater acoustic communication system based on space-time cluster processing according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present application, relevant elements related to the embodiments of the present invention will be described first.
OTFS (Orthogonal Time Frequency Space) is a modulation method that a QAM symbol (QAM is a vector modulation, input bits are first mapped (generally using gray code) onto a complex plane (constellation) to form a complex modulation symbol, and then I, Q components of the symbol (corresponding to the real part and imaginary part of the complex plane, i.e. horizontal and vertical directions) are modulated in amplitude and respectively corresponding to two carriers (cos and sin) Orthogonal in the Time domain) are multiplexed to a signal represented by using a delay-doppler domain. The delay-doppler domain is a new way to express signals. In the field of mathematics, the delay-doppler format is commonly referred to as the lattice format of the heisenberg group. OTFS can integrate time and frequency domains together, and is a modulation method with profound effects. The traditional TDM (Time-division Multiplexing: a communication technique in which different signals are interleaved in different Time periods and transmitted along the same channel, and signals in each Time period are extracted and restored to original signals by using a certain method at a receiving end) multiplexes QAM symbols onto continuous Time periods; FDM (Frequency Division Multiplexing, also called Frequency Division Multiplexing, is a Multiplexing technique that modulates multiple baseband signals onto different Frequency carriers and then superimposes them to form a composite signal) is to multiplex them onto continuous Frequency bands. Thus, in a broader sense, OTFS establishes a conceptual bridge between radar and communication.
The invention provides an underwater acoustic communication method based on space-time cluster processing and related equipment. In the invention, the OTFS modulation technology is adopted at the transmitting end to carry out the first modulation on the filtered baseband signal, and after the receiving end utilizes the space-time processor array to receive the UWA signal, the multi-path signal combination processing operation in each direction is carried out, so that the space-time cluster is extracted and obtained, the transmitting signal is better restored and obtained, the space-time characteristic of the transmitting signal is fully utilized, the space-time processing is conveniently carried out by the receiving end array, the system performance is improved, the system performance gain is realized by utilizing the receiving array, the influence caused by a channel is further reduced, the time-frequency characteristic of the signal after OTFS modulation is effectively combined with the space-time multi-path processing, and the communication quality and the system performance are improved.
The following describes a design scheme of an underwater acoustic communication method based on space-time cluster processing by using a specific exemplary embodiment, and it should be noted that the following embodiment is only used for explaining the technical scheme of the invention, and is not specifically limited:
referring to fig. 1, the underwater acoustic communication method based on space-time cluster processing provided by the present invention includes the following steps:
s100, the transmitting end carries out mapping and pulse shaping filtering processing on the transmitting signal to obtain a filtered baseband signal.
Specifically, when an original signal, i.e., a transmission signal, needs to be sent, at a transmitting end, mapping and pulse shaping filtering processing are sequentially performed on the original signal to obtain a filtered baseband signal, so that inter-symbol interference is effectively reduced.
Further, referring to fig. 2, the step of performing mapping and pulse shaping filtering processing on the transmission signal by the transmitting end to obtain the filtered baseband signal specifically includes:
s110, the transmitting terminal adopts a mapping modulation technology to map the transmitting signal to obtain a baseband signal;
s120, the transmitting end performs pulse shaping filtering processing on the baseband signal to obtain a filtered baseband signal; the mapping Modulation technique includes BPSK (Binary Phase Shift Keying), which is one of conversion methods for converting an analog signal into a data value, and represents an information Keying Phase Shift method by using a complex wave combination of a deviation Phase, QPSK (Quadrature Phase Shift Keying, which is a digital Modulation method and is divided into two types of absolute Phase Shift and relative Phase Shift) Modulation, QAM (Quadrature Amplitude Modulation, which is a Modulation method for performing Amplitude Modulation on two orthogonal carriers), and other Modulation techniques.
Specifically, when an original signal needs to be sent, at a transmitting end, firstly, mapping the transmitted signal by using a mapping modulation technology to obtain a baseband signal, and then, performing pulse shaping filtering processing on the baseband signal by using a square root raised cosine filter to obtain a filtered baseband signal so as to perform the next operation; the transmitting signal is mapped and pulse-shaped and filtered by the transmitting terminal in sequence, so that the analog transmitting signal is effectively converted into the digital baseband signal, harmonic waves, ripple waves and the like in the baseband signal are effectively filtered, and the communication quality is improved.
Further, with reference to fig. 1, S200, the transmitting end performs a first modulation process on the filtered baseband signal to obtain a modulated signal.
Specifically, the baseband signal is subjected to pulse shaping filtering processing at the transmitting end to obtain a filtered baseband signal, and then the first modulation processing is continued to obtain a modulated signal, so that noise in the filtered baseband signal is effectively suppressed.
Further, S200, the step of performing, by the transmitting end, a first modulation process on the filtered baseband signal to obtain a modulated signal specifically includes:
and S210, the transmitting end performs primary modulation processing on the filtered baseband signal by adopting an OTFS modulation technology to obtain the modulation signal.
Specifically, after the baseband signal is subjected to pulse shaping filtering processing to obtain a filtered baseband signal, an OTFS modulation technique is adopted to perform first modulation processing on the filtered baseband signal to obtain a modulated signal, so that noise in transmission is effectively suppressed.
Further, please continue to refer to fig. 1, S300, the transmitting end performs a second modulation on the modulated signal to obtain a UWA signal, and sends the UWA signal to a UWA channel.
Specifically, after the transmitting end performs first modulation processing on the filtered baseband signal to obtain the modulation signal, the modulation signal is further modulated, so that the spectrum of the modulation signal is shifted, and the modulation signal can be transmitted for a longer distance after being modulated for the second time.
Further, the step S300 of performing, by the transmitting end, a second modulation on the modulated signal to obtain a UWA signal, and sending the UWA signal to a UWA channel specifically includes:
s310, the transmitting end carries out carrier modulation processing on the modulation signal to obtain a UWA signal and sends the UWA signal to a UWA channel; wherein, the UWA channel is an underwater acoustic channel.
Specifically, when the transmitting end performs the first modulation processing on the filtered baseband signal to obtain the modulation signal, the modulated signal is subjected to carrier modulation processing to obtain a UWA signal (the UWA signal is a continuous wave signal, namely a continuous high-frequency carrier generated by a local oscillator), so that not only can noise in the modulated signal be further suppressed, but also frequency spectrum shifting and frequency division multiplexing of the modulated signal can be realized, and after the UWA signal is subjected to sinusoidal carrier modulation, can propagate a longer distance in the UWA channel (the underwater acoustic channel), effectively enhances the transmission capability and transmission efficiency of signals, and makes the multi-channel signal transmitted in the same channel not easy to be mixed, at the same time it is favourable for receiving of receiving end, and further, the effectiveness and reliability of system transmission are improved, and the communication quality and the system performance are effectively improved.
Further, please continue to refer to fig. 1, S400, the receiving end receives the UWA signal by using the space-time processor array, and extracts a space-time cluster after performing multi-path signal combination processing on the UWA signal in each direction.
Specifically, after the transmitting end transmits the UWA signal to the UWA channel, the receiving end receives the UWA signal by using a space-time processor array, and extracts a space-time cluster and the like after performing multipath signal combination processing in each direction on the UWA signal.
Further, referring to fig. 3, in S400, the step of receiving, by the receiving end, the UWA signal by using the space-time processor array, and extracting a space-time cluster after performing multi-path signal combination processing on the UWA signal in each direction specifically includes:
s410, the receiving end receives the UWA signal transmitted in the UWA channel, and performs band-pass filtering processing on the UWA signal to obtain a filtered UWA signal;
s420, the space-time processor array receives the filtered UWA signal, wherein the space-time processor array is composed of a plurality of space-time processors;
s430, the space-time processor array extracts the peak value of the filtered UWA signal so as to estimate DOAs of all multi-paths in the UWA signal;
s440, the space-time processor array forms beams in the direction of each DOA to obtain multi-path signals in the direction of each DOA;
s450, after the time delay of the multipath signals is estimated by the space-time processor array, a plurality of space-time clusters are extracted and obtained.
Specifically, referring to the block diagram of the space-time processor shown in fig. 4 together, after the transmitting end transmits the UWA signal to the UWA channel, at the receiving end, first, a band-pass filter performs band-pass filtering on the UWA signal to obtain a filtered UWA signal; then, the space-time processor array composed of a plurality of space-time processors serves as a receiver to receive the filtered UWA signal (the specific schematic diagram is a multipath signal model and a system layout diagram shown in fig. 5, and if the space-time processor array is located in the far field, the UWA signal is incident to the space-time processor array as a plane-parallel wave), and further, the filtered UWA signal is subjected to peak extraction to estimate DOAs of all multipaths in the UWA signal and form a beam in the direction of each DOA to obtain multipath signals in the direction of each DOA; finally, after the time delay of the multipath signals is estimated by the space-time processor array, a plurality of space-time clusters are extracted; the space-time distribution diagram of the multipath signal is as shown in fig. 6, which shows that there are two multipaths in each DOA, that is, the space-time two-dimensional receiver is used to process the UWA signal, so that the correct transmission probability of the communication system can be effectively improved.
In the application, the filtered UWA signal is received by the space-time processor array formed by the plurality of space-time processors together, the array signal processing technology is utilized, the system performance gain is effectively realized, and meanwhile, the signal form, the modulation mode and the receiving end array signal processing scheme are organically combined together by organically combining the space-time characteristic of the transmitting end signal with the space-time array of the receiving end array, so that the system performance can be further improved.
Further, in S450, after the time delay of the multipath signal is estimated by the space-time processor array, the step of extracting a plurality of space-time clusters specifically includes:
s451, the space-time processor array estimates the time delay of the multipath signal by using a matching pursuit algorithm, and extracts a plurality of space-time clusters with information grouped in the DOA direction.
Specifically, after the space-time processor array forms beams in the directions of the respective DOAs to obtain multipath signals in the directions of the respective DOAs, the time delay of the multipath signals is further estimated by using the matching tracking algorithm, and if the channel is linear and time-invariant in the signal transmission process, a space-time cluster of the multipath signals can be extracted.
For example, when the signal-to-noise ratio is 10dB, the space spectrum corresponding to the simulated channel obtained by DOA estimation (DOA estimation is to determine the spatial positions of multiple signals of interest (i.e. the direction angles of multiple signals to the array reference array element) in a certain region of space at the same time) is as shown in fig. 7, and it can be seen from this that the underwater acoustic communication method based on space-time cluster processing can accurately estimate the DOA of multipath signals under the condition of negative signal-to-noise ratio.
Further, please continue to refer to fig. 1, S500, after the receiving end demodulates and pulse shapes the space-time cluster, the transmitting signal is obtained by restoring.
Specifically, after a matching pursuit algorithm is used for estimating the time delay of the multipath signal and extracting a plurality of space-time clusters with information grouped in the direction of DOA, the space-time clusters are demodulated, pulse-shaped and filtered, and finally the transmitted signal is restored, so that the transmitted signal is effectively restored, and the processes of transmitting, transmitting and receiving the original signal are realized.
Further, referring to fig. 8, in S500, after the receiving end performs demodulation and pulse shaping filtering on the space-time cluster, the step of restoring to obtain the transmission signal specifically includes:
s510, the receiving end carries out carrier demodulation processing on the space-time cluster to obtain a first demodulation signal;
s520, the receiving end carries out secondary demodulation processing on the first demodulation signal by adopting an OTFS demodulation technology to obtain a second demodulation signal;
s530, the receiving end carries out pulse shaping filtering processing on the second demodulation signal to obtain a baseband signal;
s540, the receiving end restores the baseband signal by adopting a coding technology to obtain the transmitting signal; the coding technology comprises Turbo Code (Turbo Code is a high-performance error correction Code applied to outer space satellite communication and other wireless communication application programs which are used by designers to complete maximum information transmission and pass through a bandwidth-limited communication link in the presence of data-destructive noise), convolutional Code coding and LDPC Code (Low Density Parity Check Code is a forward error correction Code).
Specifically, after extracting a plurality of information-bearing space-time clusters grouped in the DOA direction, the receiving end performs carrier demodulation on the space-time clusters to obtain a first demodulated signal, performs a second demodulation on the first demodulated signal by using an OTFS demodulation technique to obtain a second demodulated signal, performs pulse shaping filtering on the second demodulated signal by using a square root raised cosine filter to obtain a baseband signal, and reduces the baseband signal by using a coding technique to obtain the transmit signal, so that the space-time clusters are reduced into the transmit signal by sequentially performing carrier demodulation, OTFS demodulation, pulse shaping filtering, decoding, and the like, thereby effectively achieving reduction of signals and finally reducing analog signals into digital signals.
Further, referring to fig. 9, the underwater acoustic communication system based on space-time cluster processing provided by the present invention includes: a transmitting end 10 and a receiving end 20;
the transmitting terminal 10 is configured to perform mapping and pulse shaping filtering processing on a transmitting signal to obtain a filtered baseband signal, perform first modulation processing on the filtered baseband signal to obtain a modulated signal, perform second modulation on the modulated signal to obtain a UWA signal, and send the UWA signal to a UWA channel;
the receiving end 20 is configured to receive the UWA signal by using a space-time processor array, perform multi-path signal combination processing in each direction on the UWA signal, extract a space-time cluster, perform demodulation and pulse shaping filtering processing on the space-time cluster, and restore the space-time cluster to obtain the transmission signal; wherein, the receiving end 20 includes: the space-time processor array, the space-time processor array consisting of a plurality of space-time processors.
Specifically, the transmitting signal is subjected to mapping, pulse shaping filtering and first modulation processing in sequence through the transmitting end, so that the simulated transmitting signal is effectively converted into a digital UWA signal, and frequency spectrum shifting and frequency division multiplexing are performed, so that the transmission capability and transmission efficiency of the signal are effectively enhanced, the effectiveness and reliability of system transmission are improved, and the communication quality and the system performance are effectively improved; and the space-time processor array is used for receiving the UWA signal, then the UWA signal is processed to obtain the space-time cluster, then the space-time cluster is demodulated and coded, and the UWA signal is restored into the transmitting signal, so that the signal receiving capacity of the system is effectively improved, namely the gain of the system performance is realized, and meanwhile, the space-time characteristic of the signal of the transmitting end 10 is organically combined with the space-time array of the receiving end 20 array, so that the system performance is further effectively improved.
Further, the present invention provides a computer readable storage medium, where the computer readable storage medium stores an underwater acoustic communication program based on space-time cluster processing, and when the underwater acoustic communication program based on space-time cluster processing is executed by a processor, the steps of the underwater acoustic communication method based on space-time cluster processing as described above are implemented; since the above-mentioned steps of the underwater acoustic communication method based on the space-time cluster processing are described in detail, no further description is given here.
In summary, the underwater acoustic communication method based on space-time cluster processing and the related device provided by the present invention include the following steps: mapping and pulse shaping filtering processing are carried out on the transmitting signal at a transmitting end, and a filtered baseband signal is obtained; carrying out first modulation processing on the filtered baseband signal to obtain a modulation signal; and carrying out second modulation on the modulation signal to obtain a UWA signal, and sending the UWA signal to a UWA channel; performing band-pass filtering at a receiving end to filter out-of-band noise, extracting corresponding frequency band signals, and then performing multi-path signal combination processing on the UWA signals in each direction by using a space-time processor array to obtain space-time clusters; and after the space-time cluster is subjected to demodulation and pulse shaping filtering processing, restoring to obtain a transmitting signal. The filtered baseband signals are modulated at the transmitting end through an OTFS modulation technology, UWA signals are processed at the receiving end through a space-time processor array to obtain space-time clusters, and finally, the transmitting signals are obtained through reduction.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (13)
1. A space-time cluster processing-based underwater acoustic communication method is characterized by comprising the following steps:
the transmitting end carries out mapping and pulse shaping filtering processing on the transmitting signal to obtain a filtered baseband signal;
the transmitting end carries out first modulation processing on the filtered baseband signal to obtain a modulation signal;
the transmitting end carries out secondary modulation on the modulation signal to obtain a UWA signal and sends the UWA signal to a UWA channel;
a receiving end receives the UWA signal by utilizing a space-time processor array, and extracts a space-time cluster after multi-path signal combination processing is carried out on the UWA signal in each direction;
and the receiving end demodulates and pulse shapes the space-time cluster, filters the space-time cluster, and restores the space-time cluster to obtain the transmitting signal.
2. A space-time cluster processing-based underwater acoustic communication method according to claim 1, wherein the step of mapping and pulse-shaping filtering the transmission signal by the transmitting end to obtain a filtered baseband signal specifically comprises:
the transmitting terminal adopts a mapping modulation technology to map the transmitting signal to obtain a baseband signal;
and the transmitting end performs pulse shaping filtering processing on the baseband signal to obtain a filtered baseband signal.
3. A space-time cluster processing-based underwater acoustic communication method according to claim 2, wherein the step of performing the first modulation processing on the filtered baseband signal by the transmitting end to obtain a modulated signal specifically comprises:
and the transmitting end carries out primary modulation processing on the filtered baseband signal by adopting an OTFS modulation technology to obtain the modulation signal.
4. A space-time cluster processing-based underwater acoustic communication method according to claim 2, wherein said mapping modulation technique includes BPSK modulation, QPSK modulation and QAM modulation.
5. A space-time cluster processing-based underwater acoustic communication method according to claim 1, wherein the step of performing the second modulation on the modulated signal by the transmitting end to obtain a UWA signal and sending the UWA signal to a UWA channel specifically includes:
and the transmitting end carries out carrier modulation processing on the modulation signal to obtain a UWA signal and sends the UWA signal to a UWA channel.
6. A space-time cluster processing-based underwater acoustic communication method according to claim 5, wherein said UWA channel is an underwater acoustic channel.
7. A space-time cluster processing-based underwater acoustic communication method according to claim 1, wherein the step of receiving the UWA signal at the receiving end by using a space-time processor array, and extracting a space-time cluster after performing multi-path signal combination processing on the UWA signal in each direction specifically comprises:
the receiving end receives the UWA signal transmitted in the UWA channel, and performs band-pass filtering processing on the UWA signal to obtain a filtered UWA signal;
the space-time processor array receives the filtered UWA signal, wherein the space-time processor array is composed of a plurality of space-time processors;
the space-time processor array extracts the peak value of the filtered UWA signal so as to estimate DOAs of all multi-paths in the UWA signal;
the space-time processor array forms beams in the direction of each DOA to obtain multi-path signals in the direction of each DOA;
and after the time delay of the multipath signals is estimated by the space-time processor array, extracting to obtain a plurality of space-time clusters.
8. A space-time cluster processing-based underwater acoustic communication method according to claim 7, wherein the step of extracting a plurality of space-time clusters after the space-time processor array estimates the time delay of the multipath signal specifically comprises:
and the space-time processor array estimates the time delay of the multipath signal by using a matching tracking algorithm and extracts and obtains a plurality of space-time clusters which are grouped in the DOA direction and have information.
9. A space-time cluster processing-based underwater acoustic communication method according to claim 1, wherein the step of restoring the transmitted signal after the receiving end performs demodulation and pulse shaping filtering processing on the space-time cluster specifically comprises:
the receiving end carries out carrier demodulation processing on the space-time cluster to obtain a first demodulation signal;
the receiving end adopts an OTFS demodulation technology to perform second demodulation processing on the first demodulation signal to obtain a second demodulation signal;
the receiving end carries out pulse shaping filtering processing on the second demodulation signal to obtain a baseband signal;
and the receiving end restores the baseband signal by adopting an encoding technology to obtain the transmitting signal.
10. A space-time cluster processing-based underwater acoustic communication method according to claim 9, wherein said coding technique includes the use of Turbo code coding, convolutional code coding and LDPC code coding.
11. An underwater acoustic communication system based on space-time cluster processing, characterized in that the underwater acoustic communication system based on space-time cluster processing comprises: a transmitting end and a receiving end;
the transmitting terminal is used for mapping and pulse shaping filtering processing of a transmitting signal to obtain a filtered baseband signal, performing first modulation processing on the filtered baseband signal to obtain a modulation signal, performing second modulation on the modulation signal to obtain a UWA signal, and sending the UWA signal to a UWA channel;
and the receiving end is used for receiving the UWA signal by using the space-time processor array, extracting a space-time cluster after multi-path signal combination processing in each direction is carried out on the UWA signal, and restoring the space-time cluster after demodulation and pulse shaping filtering processing is carried out on the space-time cluster to obtain the transmitting signal.
12. A space-time cluster processing-based underwater acoustic communication system according to claim 11, wherein said receiving end comprises: the space-time processor array, wherein the space-time processor array is comprised of a plurality of space-time processors.
13. A computer-readable storage medium, wherein the computer-readable storage medium stores a space-time cluster processing based underwater acoustic communication program, and when the space-time cluster processing based underwater acoustic communication program is executed by a processor, the steps of the space-time cluster processing based underwater acoustic communication method according to any one of claims 1 to 10 are implemented.
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