Underwater acoustic communication method, device, electronic equipment and system

Abstract

The application discloses a kind of underwater acoustic communication method, device, electronic equipment and system, the underwater acoustic communication method includes: obtaining first communication data;The first communication data is encoded by low-density parity-check code, and coding data is obtained;The carrier modulation is carried out to the coding data, and first modulation signal is obtained;The sound track angular momentum modulation is carried out to the first modulation signal, and second modulation signal is obtained;The second modulation signal is sent to receiving end by underwater acoustic channel.This application solves the technical problem that underwater acoustic communication spectrum utilization is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a method and device for underwater acoustic communication, electronic equipment and system. BACKGROUND

[0002] Land communication mainly relies on electromagnetic waves, and the speed can reach the speed of light, but underwater wireless communication cannot use the radio communication system any more, because the electromagnetic wave decays very seriously in water medium, which leads to that the radio communication system cannot be applied to underwater. It is found later that the attenuation of sound wave energy in underwater propagation process is much smaller than that of electromagnetic wave, and the propagation distance of sound wave signal in water can meet the communication requirements, so it plays an important role in the fields of marine scientific observation, marine engineering construction and national defense security.

[0003] However, due to the large propagation loss of high-frequency sound wave underwater, the frequency spectrum bandwidth and communication rate of data transmission are greatly limited, and the spectrum utilization rate is low. SUMMARY

[0004] The main purpose of the present application is to provide a method and device for underwater acoustic communication, electronic equipment and system, aiming at solving the technical problem of low spectrum utilization rate of underwater acoustic communication.

[0005] To achieve the above purpose, the present application provides a method for underwater acoustic communication, which is applied to a transmitting end and includes the following steps:

[0006] obtaining first communication data;

[0007] encoding the first communication data by low-density parity-check code to obtain encoded data;

[0008] modulating the encoded data by carrier wave to obtain a first modulated signal;

[0009] modulating the first modulated signal by sound orbital angular momentum to obtain a second modulated signal;

[0010] sending the second modulated signal to a receiving end through an underwater acoustic channel.

[0011] The present application also provides a device for underwater acoustic communication, which includes:

[0012] The present application also provides a method for underwater acoustic communication, which is applied to a receiving end and includes the following steps:

[0013] obtaining first communication data;

[0014] encoding the first communication data by low-density parity-check code to obtain encoded data;

[0015] carrier modulating the coded data to obtain a first modulated signal;

[0016] orbit angular momentum modulating the first modulated signal to obtain a second modulated signal;

[0017] sending the second modulated signal to a receiving end through an underwater acoustic channel.

[0018] Optionally, the step of carrier modulating the coded data to obtain a first modulated signal comprises:

[0019] quadrature phase mapping the coded data, and carrier modulating the mapped coded data to obtain a first modulated signal.

[0020] Optionally, the transmitting end comprises eight transmitting sources, and the transmitting sources are arranged into a first equidistant circular phased array.

[0021] The step of orbit angular momentum modulating the first modulated signal to obtain a second modulated signal comprises:

[0022] According to a preset order, different initial phases are respectively assigned to the first modulated signals of the paths, and an excitation signal is applied to each first modulated signal to obtain a second modulated signal.

[0023] The application further provides a kind of underwater acoustic communication device, the underwater acoustic communication device is applied to transmitting end, comprising:

[0024] acquisition module, for obtaining first communication data;

[0025] low density parity check code encoding module, for low density parity check code encoding the first communication data, to obtain coded data;

[0026] carrier modulation module, for carrier modulating the coded data to obtain a first modulated signal;

[0027] orbit angular momentum modulation module, for orbit angular momentum modulating the first modulated signal to obtain a second modulated signal;

[0028] signal sending module, for sending the second modulated signal to a receiving end through an underwater acoustic channel.

[0029] The application further provides a kind of underwater acoustic communication method, the underwater acoustic communication method is applied to receiving end, comprising the following steps:

[0030] receiving the second modulated signal sent by transmitting end;

[0031] orbit angular momentum demodulating the second modulated signal to obtain a demodulated signal;

[0032] digitally demodulating the demodulation signal to obtain to-be-decoded data;

[0033] low-density parity-check code-decoding the to-be-decoded data to obtain second communication data.

[0034] Optionally, the step of digitally demodulating the demodulation signal to obtain to-be-decoded data comprises:

[0035] quadrature phase shift keying demodulating the demodulation signal to obtain to-be-decoded data.

[0036] Optionally, the receiving end comprises eight receiving sources, and the receiving sources are arranged into a second equidistant circular phased array.

[0037] The application further provides a kind of underwater acoustic communication device, the underwater acoustic communication device is applied to receiving end, comprising:

[0038] signal receiving module, for receiving the second modulation signal sent by transmitting end;

[0039] acoustic orbital angular momentum demodulation module, for the second modulation signal is demodulated by acoustic orbital angular momentum, obtains demodulation signal;

[0040] digital demodulation module, for the demodulation signal is digitally demodulated, to obtain to-be-decoded data;

[0041] low-density parity-check code-decoding module, for the to-be-decoded data is low-density parity-check code-decoded, obtains second communication data.

[0042] The application further provides a kind of electronic equipment, the electronic equipment is entity equipment, the electronic equipment includes: memory, processor and the program of the underwater acoustic communication method of the memory and the underwater acoustic communication method of the program of the processor stored on the memory and can be run on the processor, the program of the underwater acoustic communication method is executed by processor when can realize the steps of the underwater acoustic communication method as described above.

[0043] The application further provides a kind of underwater acoustic communication system, the underwater acoustic communication system includes transmitting end and receiving end, wherein,

[0044] the transmitting end is used to execute the following steps:

[0045] obtain first communication data;

[0046] low-density parity-check code-encoding the first communication data to obtain encoded data;

[0047] carrier modulating the encoded data to obtain first modulation signal;

[0048] acoustic orbital angular momentum modulating the first modulation signal to obtain second modulation signal;

[0049] transmitting the second modulation signal to a receiving end through an underwater acoustic channel;

[0050] The receiving end is configured to perform the following steps:

[0051] receiving the second modulation signal transmitted by the transmitting end;

[0052] performing acoustic orbital angular momentum demodulation on the second modulation signal to obtain a demodulation signal;

[0053] performing digital demodulation on the demodulation signal to obtain to-be-decoded data;

[0054] performing low-density parity-check code decoding on the to-be-decoded data to obtain second communication data.

[0055] The present application provides an underwater acoustic communication method, device, electronic equipment and system, by acquiring first communication data, performing low-density parity-check code encoding on the first communication data to obtain encoded data, realizing the encoding of the first communication data, obtaining encoded data with error detection and correction functions, increasing the reliability of underwater acoustic communication, and then performing carrier modulation on the encoded data to obtain a first modulation signal, performing acoustic orbital angular momentum modulation on the first modulation signal to obtain a second modulation signal, realizing signal modulation in the spatial dimension, and then transmitting the second modulation signal to a receiving end through an underwater acoustic channel, realizing a fold increase in underwater acoustic communication spectrum utilization. Acoustic orbital angular momentum modulation has an infinite number of mutually orthogonal modes, compared with single carrier modulation, an additional spatial dimension is added, which can effectively improve the spectrum utilization. At the same time, due to the attenuation of acoustic signals during underwater transmission and the influence of acoustic orbital angular momentum crosstalk, signal transmission errors may occur. Low-density parity-check code encoding can effectively increase the reliability of underwater acoustic communication, effectively improve the spectrum utilization of underwater acoustic communication while ensuring the reliability of underwater acoustic communication, and overcome the technical problem of low spectrum utilization of underwater acoustic communication. BRIEF DESCRIPTION OF DRAWINGS

[0056] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0058] Figure 1A flow chart of an embodiment of the method for underwater acoustic communication;

[0059] Figure 2 A constellation diagram of four-phase mapping in the method for underwater acoustic communication;

[0060] Figure 3 A flow chart of another embodiment of the method for underwater acoustic communication;

[0061] Figure 4 A scene diagram of an implementable manner of the method for underwater acoustic communication;

[0062] Figure 5 A structural diagram of a hardware running environment involved in the embodiment of the application;

[0063] Figure 6 A structural diagram of an embodiment of the system for underwater acoustic communication.

[0064] The purposes, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0065] In order to make the above objectives, features and advantages of the application more apparent, clear and easy to understand, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application.

[0066] Land communication mainly relies on electromagnetic waves, and the speed can reach the speed of light, but underwater wireless communication cannot use the radio communication system any more, because electromagnetic waves decay particularly seriously in water medium, resulting in that the radio communication system cannot be applied to underwater at all. It is found later that the attenuation of sound wave energy in underwater propagation process is much smaller than that of electromagnetic waves, and the propagation distance of sound wave signals in water can meet the communication requirements, so the sound wave plays an important role in the fields of marine scientific observation, marine engineering construction and national defense security.

[0067] However, due to the large loss of high-frequency sound waves in underwater propagation, the spectral bandwidth and communication rate of data transmission are greatly limited, and the spectral utilization rate is low. In the prior art, in order to improve the spectral utilization rate, high-order modulation techniques are mainly used, such as multiple-input multiple-output underwater acoustic communication technology, simultaneous same frequency full duplex underwater acoustic communication technology, and the combination of these technologies. However, for underwater acoustic communication, the communication bandwidth is severely limited, and the spectral utilization rate that can be improved by the above schemes is limited. For example, for a simultaneous same frequency full duplex underwater acoustic communication system, assuming that the useful bandwidth of the system is B and the communication rate is R, the transmission and reception data are performed on the same frequency band at the same time slot, then the communication rate of the system is 2R, the occupied bandwidth is B, and the spectral utilization rate is 2R / B, which can only improve the spectral utilization rate by one time.

[0068] To this end, the present application provides a kind of underwater acoustic communication method, device, electronic equipment and system, by obtaining first communication data, the first communication data is encoded with low-density parity-check code, and the encoded data is obtained, the encoding of first communication data is realized, and the encoded data with error detection and error correction function is obtained, the reliability of underwater acoustic communication is increased, and then the carrier modulation is carried out on the encoded data, and the first modulation signal is obtained, the sound track angular momentum modulation is carried out on the first modulation signal, and the second modulation signal is obtained, the signal modulation in space dimension is realized, and then the second modulation signal is sent to receiving end through underwater acoustic channel, and the spectral utilization rate of underwater acoustic communication is doubled. Sound track angular momentum modulation has infinite mutually orthogonal modes, compared with single carrier modulation, a space dimension is added, and then the spectral utilization rate can be effectively improved, and due to the attenuation of sound signal in underwater transmission process and the influence of sound track angular momentum crosstalk, signal transmission error may occur, low-density parity-check code encoding can effectively increase the reliability of underwater acoustic communication, and then the spectral utilization rate of underwater acoustic communication is effectively improved under the condition of ensuring the reliability of underwater acoustic communication, and the technical problem of low spectral utilization rate of underwater acoustic communication is overcome.

[0069] The embodiment of the present application provides a kind of underwater acoustic communication method, in the first embodiment of the present application underwater acoustic communication method, refer to Figure 1 , the underwater acoustic communication method is applied to transmitting end, comprising the following steps:

[0070] Step S10, obtaining first communication data;

[0071] In the embodiment, it should be noted that the underwater acoustic communication method is applied to a transmitting end, the transmitting end includes at least three transmitting sources to ensure that the transmitting end can transmit acoustic orbital angular momentum of at least ±1 order, the transmitting source is a transducer, the first communication data refers to communication data received by the transmitting end from an external device and to be transmitted to a receiving end, when the underwater acoustic channel includes multiple sub-channels, the first communication data refers to communication data corresponding to each sub-channel.

[0072] Specifically, the transmitting end receives a communication data packet sent by an external device, parses the communication data packet according to a preset Ethernet transmission protocol, obtains original communication data in the communication data packet, and the specific content of the original communication data can be a picture, a video, or an audio, etc. The original communication data is divided into multiple data blocks corresponding to communication channels one by one, and the data blocks are combined into first communication data corresponding to the communication channels one by one, wherein the Ethernet transmission protocol includes but is not limited to a general TCP / IP protocol.

[0073] In step S20, the first communication data is subjected to low-density parity check code encoding to obtain encoded data.

[0074] In the embodiment, it should be noted that LDPC (Low Density Parity Check Code) is a kind of linear block code with a sparse check matrix, which not only has good performance close to the Shannon limit, but also has low decoding complexity and flexible structure.

[0075] Specifically, the first communication data is subjected to channel encoding through a preset LDPC encoding and decoding algorithm or an LDPC decoder to obtain encoded data, wherein the LDPC encoding and decoding algorithm includes a bit flipping algorithm, a weighted bit flipping algorithm, a belief propagation algorithm, etc., the specific content is similar to the prior art, and thus will not be described here.

[0076] In step S30, the encoded data is subjected to carrier modulation to obtain a first modulation signal.

[0077] In the embodiment, specifically, the obtained coded data after coding is a baseband digital signal, an analog baseband signal is obtained after baseband shaping filtering, and the analog baseband signal is multiplied by a carrier to obtain a first modulation signal, wherein the carrier modulation can be amplitude modulation, frequency modulation or phase modulation, and specifically includes PSK (Phase Shift Keying), QAM (Quadrature Amplitude Modulation), ASK (Amplitude shift keying), FSK (Frequency Shift Keying) and the like, wherein the PSK includes BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying) and the like.

[0078] Optionally, the step of carrier modulating the coded data to obtain the first modulation signal comprises:

[0079] The coded data is subjected to four-phase mapping, and the mapped coded data is subjected to carrier modulation to obtain the first modulation signal.

[0080] In the embodiment, specifically, the coded data is subjected to four-phase mapping, that is, quadrature phase shift keying, each two bits are converted into a four-element symbol, corresponding to four carriers of the modulation signal, and the number of elements of the multi-element symbol is equal to the capacity of the modulation constellation. The multi-element symbol generated after mapping is still a baseband digital signal, an analog baseband signal is obtained after baseband shaping filtering, and the analog baseband signal is multiplied by a carrier to obtain a first modulation signal, thereby realizing frequency band compression, wherein the constellation diagram of the four-phase mapping is as shown in Figure 2

[0081] Step S40, the first modulation signal is subjected to acoustic orbital angular momentum modulation to obtain a second modulation signal.

[0082] In the embodiment, it should be noted that the orbital angular momentum refers to the angular momentum generated by the spiral phase structure, and the acoustic orbital angular momentum refers to the angular momentum generated by the spiral phase structure of the vortex sound beam. The acoustic orbital angular momentum has an infinite number of mutually orthogonal modes, so that the information modulation increases by one spatial dimension.

[0083] Specifically, the first modulation signal can be subjected to acoustic orbital angular momentum modulation by an active array acoustic orbital angular momentum emission technology or a passive structure acoustic orbital angular momentum emission technology to obtain a second modulation signal, wherein the order of the acoustic orbital angular momentum modulation can be determined according to actual needs, and the embodiment does not limit this.​

[0084] Optionally, the transmitting end comprises 8 transmitting sources, and each of the transmitting sources is arranged in a first equidistant circular phased array.

[0085] The step of performing acoustic orbital angular momentum modulation on the first modulation signals to obtain second modulation signals comprises:

[0086] According to a preset order, different initial phases are respectively given to each of the first modulation signals, an excitation signal is applied to each of the first modulation signals to obtain second modulation signals.

[0087] In the embodiment, the transmitting end comprises 8 transmitting sources, which can emit acoustic orbital angular momentum of orders of ±4, ±3, ±2 or ±1. The frequency spectrum utilization rate is increased by a multiple equal to the order of the acoustic orbital angular momentum. For example, if different acoustic orbital angular momentums of order 4 are emitted, the frequency spectrum utilization rate is 4 times that of the original. In order to achieve a multiple increase in the frequency spectrum utilization rate, each of the transmitting sources is arranged in a first equidistant circular phased array, that is, each of the transmitting sources is arranged on the circumference of the same circle, and the included angle between any two adjacent transmitting sources is 360° / 8 = 45°. The radius of the first equidistant circular phased array can be determined according to actual needs or actual test results, which is not limited in the embodiment.

[0088] Specifically, the order of acoustic orbital angular momentum modulation is determined, the initial phase difference between the first modulation signals of two adjacent channels is calculated and determined according to the order and the number of the transmitting sources, the initial phase difference is equal to 2π divided by the number of the transmitting sources, and then multiplied by the order. Any one of the transmitting sources can be determined as a first transmitting source. An initial phase of the first modulation signal of the first transmitting source is given a preset initial value, for example, 0. The initial phase of the first modulation signal of the first transmitting source is added or subtracted on the basis of the preset initial value to obtain the initial phase of the first modulation signal of a subchannel corresponding to a transmitting source adjacent to the first transmitting source. According to the same method, the initial phases of the first modulation signals of each channel are sequentially determined and given clockwise or counterclockwise. For example, if the transmitting end comprises 8 transmitting sources and the order is 1, the initial phase difference is determined to be 2π / 8 = π / 4. The initial phase of the first modulation signal of any one channel can be determined to be 0. The initial phase of the first modulation signal of each transmitting source is determined clockwise from the transmitting source corresponding to this channel as the starting point to be π / 4, π / 2, 3π / 4, π, 5π / 4, 3π / 2, 7π / 4. If the transmitting end comprises 8 transmitting sources and the order is 2, the initial phase difference is determined to be 2π*2 / 8 = π / 2. The initial phase of the first modulation signal of any one channel can be determined to be 0. The initial phase of the first modulation signal of each transmitting source is determined clockwise from the transmitting source corresponding to this channel as the starting point to be π / 2, π, 3π / 2, 2π, 5π / 2, 3π, 7π / 2.

[0089] Step S50, transmitting the second modulated signal to the receiving end through the underwater acoustic channel.

[0090] In this embodiment, specifically, each transmitting source driving the transmitting end generates a vortex acoustic beam corresponding to the second modulated signal, so that the vortex acoustic beam transmits the second modulated signal to the receiving end through the underwater acoustic channel, where the underwater acoustic channel can be a Gaussian channel or the like.

[0091] In this embodiment, by acquiring the first communication data, the first communication data is encoded by low-density parity-check code to obtain encoded data, which realizes the encoding of the first communication data and obtains encoded data with error detection and correction functions, thereby increasing the reliability of underwater acoustic communication, and then the encoded data is carrier-modulated to obtain the first modulated signal, and the first modulated signal is sound orbital angular momentum-modulated to obtain the second modulated signal, which realizes signal modulation in the spatial dimension, and then the second modulated signal is transmitted to the receiving end through the underwater acoustic channel, which realizes the doubling of the underwater acoustic communication spectrum utilization rate. The sound orbital angular momentum modulation has an infinite number of mutually orthogonal modes, compared with the carrier modulation alone, an additional spatial dimension is added, thereby effectively improving the spectrum utilization rate. At the same time, due to the attenuation of the acoustic signal during underwater transmission and the influence of sound orbital angular momentum crosstalk, signal transmission errors may occur. The low-density parity-check code encoding can effectively increase the reliability of underwater acoustic communication, thereby effectively improving the spectrum utilization rate of underwater acoustic communication while ensuring the reliability of underwater acoustic communication, and overcoming the technical problem of low spectrum utilization rate of underwater acoustic communication.

[0092] Further, the embodiment of the present application also provides an underwater acoustic communication device, which is applied to a transmitting end and comprises:

[0093] The acquisition module is configured to acquire first communication data.

[0094] The low-density parity-check code encoding module is configured to encode the first communication data by low-density parity-check code to obtain encoded data.

[0095] The carrier modulation module is configured to carrier-modulate the encoded data to obtain a first modulated signal.

[0096] The sound orbital angular momentum modulation module is configured to sound orbital angular momentum-modulate the first modulated signal to obtain a second modulated signal.

[0097] The signal transmission module is configured to transmit the second modulated signal to the receiving end through the underwater acoustic channel.

[0098] Optionally, the carrier modulation module is further configured to:

[0099] The coded data is subjected to four-phase mapping, and the mapped coded data is subjected to carrier modulation to obtain a first modulation signal.

[0100] Optionally, the sound orbital angular momentum modulation module is further configured to:

[0101] The first modulation signals of different orders are respectively assigned different initial phases according to a preset order, and an excitation signal is applied to each first modulation signal to obtain a second modulation signal.

[0102] The water acoustic communication device provided by the application solves the technical problem of low spectrum utilization rate of water acoustic communication. Compared with the prior art, the water acoustic communication device provided by the embodiment has the same beneficial effects as the water acoustic communication method provided by the embodiment, and other technical features of the water acoustic communication device are the same as the features disclosed in the method embodiment, which will not be repeated here.

[0103] Further, the embodiment of the application also provides a water acoustic communication method. In the second embodiment of the water acoustic communication method, referring to Figure 3 , the water acoustic communication method is applied to a receiving end and includes the following steps:

[0104] Step S60: receiving the second modulation signal sent by the transmitting end;

[0105] In this embodiment, it should be noted that the water acoustic communication method is applied to a receiving end, the receiving end includes at least three receiving sources, each receiving source forms a receiving array coaxially and in parallel with a transmitting array formed by each transmitting source, in an implementable manner, the number of receiving sources is the same as the number of transmitting sources of the transmitting end, the receiving source is a transducer, the first communication data refers to communication data received by the transmitting end from an external device to be transmitted to the receiving end, when the water acoustic channel includes multiple sub-channels, the first communication data refers to the communication data corresponding to each sub-channel.

[0106] Optionally, the receiving end includes eight receiving sources, and the eight receiving sources form a second equidistant circular phased array.

[0107] In this embodiment, the receiving end includes eight receiving sources, and the eight receiving sources form a second equidistant circular phased array, each receiving source corresponds to one transmitting source, and the line connecting the corresponding receiving source and the transmitting source is parallel to the line connecting the geometric center of the receiving array and the geometric center of the transmitting array.

[0108] In an implementable manner, referring to Figure 4The transmitting array element is a first equidistant circular phased array, including 8 transmitting sources, the receiving array element is a second equidistant circular phased array, including 8 receiving sources, the transmitting array element and the receiving array element are coaxially and parallelly arranged, and the axis is parallel to the x axis, each transmitting source has a corresponding receiving source, the line between the corresponding transmitting source and the receiving source is parallel to the axis, and the transmitting array element can emit a second-order acoustic orbital angular momentum to the receiving array element.

[0109] Specifically, the second modulated signal transmitted by the transmitting end is received through the underwater acoustic channel.

[0110] In step S70, the second modulated signal is subjected to acoustic orbital angular momentum demodulation to obtain a demodulated signal.

[0111] In this embodiment, specifically, the second modulated signal is subjected to acoustic orbital angular momentum demodulation to obtain a demodulated signal.

[0112] In step S80, the demodulated signal is subjected to digital demodulation to obtain to-be-decoded data.

[0113] In this embodiment, specifically, the demodulated signal is subjected to digital demodulation, and an analog baseband signal is restored into a baseband digital signal to obtain to-be-decoded data, wherein the digital demodulation includes coherent demodulation and incoherent demodulation, and the specific method can be determined according to the carrier modulation method of the transmitting end.

[0114] Optionally, the step of subjecting the demodulated signal to digital demodulation to obtain to-be-decoded data includes:

[0115] The demodulated signal is subjected to quadrature phase shift keying demodulation to obtain to-be-decoded data.

[0116] In this embodiment, specifically, if the transmitting end adopts four-phase mapping, the demodulated signal is subjected to quadrature phase shift keying demodulation to obtain to-be-decoded data.

[0117] In step S90, the to-be-decoded data is subjected to low-density parity-check code decoding to obtain second communication data.

[0118] In this embodiment, specifically, according to the low-density parity-check code encoding algorithm of the transmitting end, a corresponding low-density parity-check code decoding algorithm is determined, the to-be-decoded data is subjected to low-density parity-check code decoding to obtain second communication data, and it should be noted that the second communication data can be the same as the first communication data, or can be different due to loss in the transmission process.

[0119] In the embodiment, the received second modulation signal is demodulated by a demodulation method corresponding to the modulation process, and then the to-be-decoded data is decoded by a decoding method corresponding to the encoding process, so that the recovery of the first communication data is realized. Through the modulation and demodulation process of the OAM, the spectral utilization rate of the underwater acoustic communication can be effectively improved, so that the large-capacity first communication data can be transmitted. Through the LDPC decoding and encoding process, the error rate of the recovered second communication data can be effectively reduced, and the reliability of the second communication data can be improved.

[0120] Further, the embodiment of the application further provides an underwater acoustic communication device, which is applied to an underwater acoustic communication equipment, and the underwater acoustic communication device comprises:

[0121] a signal receiving module, configured to receive a second modulation signal sent by a transmitting end;

[0122] an acoustic orbital angular momentum demodulation module, configured to perform acoustic orbital angular momentum demodulation on the second modulation signal to obtain a demodulation signal;

[0123] a digital demodulation module, configured to perform digital demodulation on the demodulation signal to obtain to-be-decoded data;

[0124] a low-density parity-check code decoding module, configured to perform low-density parity-check code decoding on the to-be-decoded data to obtain second communication data.

[0125] Optionally, the digital demodulation module is further configured to:

[0126] perform quadrature phase shift keying demodulation on the demodulation signal to obtain the to-be-decoded data.

[0127] The underwater acoustic communication device provided by the application adopts the underwater acoustic communication method in the above embodiment, and solves the technical problem of low spectral utilization rate of underwater acoustic communication. Compared with the prior art, the underwater acoustic communication device provided by the embodiment of the application has the same beneficial effects as the underwater acoustic communication method provided by the above embodiment, and other technical features in the underwater acoustic communication device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0128] Further, the embodiment of the application provides an electronic device, which comprises at least one processor and a memory in communication connection with the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the underwater acoustic communication method in the above embodiment.

[0129] Reference will be made to the following Figure 5FIG. 1 shows a structural diagram of an electronic device suitable for implementing embodiments of the present disclosure. The electronic device in embodiments of the present disclosure can include, but is not limited to, a mobile terminal such as a mobile phone, a notebook computer, a digital broadcast receiver, a PDA (Personal Digital Assistant), a PAD (Tablet PC), a PMP (Portable Multimedia Player), and the like, and a stationary terminal such as a digital TV, a desktop computer, and the like. Figure 5 The electronic device shown is merely an example and should not impose any limitation on the functions and use range of embodiments of the present disclosure.

[0130] As shown in FIG. 1, the electronic device can include a processing device (e.g., a central processing unit, a graphic processing unit, etc.) that can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded into a random access memory (RAM) from a storage device. In the RAM, various programs and arrays required for the operation of the electronic device are also stored. The processing device, the ROM, and the RAM are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus. Figure 5 Generally, the following systems can be connected to the I / O interface: input devices including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, and the like; output devices including, for example, a liquid crystal display (LCD), a speaker, a vibrator, and the like; storage devices including, for example, a magnetic tape, a hard disk, and the like; and communication devices. The communication devices can allow the electronic device to communicate wirelessly or wiredly with other devices to exchange arrays. Although the electronic device having various systems is shown in the drawing, it should be understood that all of the systems shown are not required to be implemented or provided. More or less systems can be alternatively implemented or provided.

[0131] In particular, according to embodiments of the present disclosure, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, embodiments of the present disclosure include a computer program product including a computer program carried on a computer readable medium, the computer program containing program codes for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network through the communication devices, or installed from the storage devices, or installed from the ROM. When the computer program is executed by the processing device, the above-described functions defined in the methods of embodiments of the present disclosure are performed.

[0132]

[0133] ​The electronic device provided by the present application adopts the underwater acoustic communication method in the above embodiment, and solves the technical problem of low spectrum utilization rate of underwater acoustic communication. Compared with the prior art, the electronic device provided by the embodiment of the present application has the same beneficial effects as the underwater acoustic communication method provided by the above embodiment, and other technical features in the electronic device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0134] It should be understood that parts of the present disclosure can be realized by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0135] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0136] Further, with reference to Figure 6 The present embodiment also provides an underwater acoustic communication system, which comprises a transmitting end 10 and a receiving end 20, wherein,

[0137] The transmitting end 10 is used to perform the following steps:

[0138] obtaining first communication data;

[0139] performing low-density parity-check code encoding on the first communication data to obtain encoded data;

[0140] performing carrier modulation on the encoded data to obtain a first modulation signal;

[0141] performing acoustic orbital angular momentum modulation on the first modulation signal to obtain a second modulation signal;

[0142] sending the second modulation signal to the receiving end 20 through an underwater acoustic channel;

[0143] The receiving end 20 is used to perform the following steps:

[0144] receiving the second modulation signal sent by the transmitting end 10;

[0145] performing acoustic orbital angular momentum demodulation on the second modulation signal to obtain a demodulation signal;

[0146] performing digital demodulation on the demodulation signal to obtain to-be-decoded data;

[0147] The low-density parity-check code decoding is performed on the to-be-decoded data to obtain second communication data.

[0148] Optionally, the transmitting end 10 is configured to perform the following steps:

[0149] The four-phase mapping is performed on the encoded data, and carrier modulation is performed on the mapped encoded data to obtain a first modulation signal.

[0150] Optionally, the transmitting end 10 includes eight transmitting sources, and the transmitting sources are arranged into a first equidistant circular phased array.

[0151] Different initial phases are respectively assigned to the first modulation signals of the channels according to preset orders, and an excitation signal is applied to each of the first modulation signals to obtain a second modulation signal.

[0152] Optionally, the receiving end 20 is configured to perform the following steps:

[0153] Quadrature phase shift keying demodulation is performed on the demodulation signal to obtain to-be-decoded data.

[0154] Optionally, the receiving end 20 includes eight receiving sources, and the receiving sources are arranged into a second equidistant circular phased array.

[0155] The computer readable storage medium provided by the application stores computer readable program instructions for executing the above-mentioned underwater acoustic communication method, and solves the technical problem of low underwater acoustic communication spectrum utilization rate. Compared with the prior art, the beneficial effects of the computer readable storage medium provided by the embodiment of the application are the same as those of the underwater acoustic communication method provided by the above-mentioned embodiment, and are not described here.

[0156] Further, the application also provides a computer program product, including a computer program, when the computer program is executed by a processor, the steps of the above-mentioned underwater acoustic communication method are realized.

[0157] The computer program product provided by the application solves the technical problem of low underwater acoustic communication spectrum utilization rate. Compared with the prior art, the beneficial effects of the computer program product provided by the embodiment of the application are the same as those of the underwater acoustic communication method provided by the above-mentioned embodiment, and are not described here.

[0158] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent processing scope of the application.

Claims

1. An underwater acoustic communication method, characterized in that, The underwater acoustic communication method is applied to a transmitting end, which includes eight transmitting sources arranged in a first equally spaced circular phased array, and includes the following steps: Obtain the first communication data; The first communication data is encoded using a low-density parity-check code to obtain encoded data. The encoded data is carrier modulated to obtain a first modulated signal, wherein the carrier modulation includes amplitude modulation, frequency modulation or phase modulation; The first modulation signal is subjected to acoustic orbital angular momentum modulation to obtain a second modulation signal; wherein the step of performing acoustic orbital angular momentum modulation on the first modulation signal to obtain a second modulation signal includes: assigning different initial phases to each of the first modulation signals according to a preset order, applying an excitation signal to each of the first modulation signals to obtain a second modulation signal, wherein, based on the order of the acoustic orbital angular momentum and the number of the transmitting sources, the initial phase difference between two adjacent first modulation signals is calculated, the initial phase difference being equal to 2π divided by the number of transmitting sources and then multiplied by the order value; any one of the transmitting sources is determined as the first transmitting source, a preset initial value is assigned to the initial phase of the first modulation signal of the first transmitting source, and the preset initial value and the initial phase difference are added or subtracted to obtain the initial phase of the first modulation signal corresponding to the transmitting source adjacent to the first transmitting source; The second modulation signal is transmitted to the receiving end through an underwater acoustic channel, wherein each transmitting source of the driving end generates a vortex acoustic beam corresponding to the second modulation signal, and the vortex acoustic beam is transmitted to the receiving end through the underwater acoustic channel.

2. The underwater acoustic communication method as described in claim 1, characterized in that, The step of performing carrier modulation on the encoded data to obtain the first modulated signal includes: The encoded data is subjected to four-phase mapping, and the mapped encoded data is then carrier-modulated to obtain a first modulated signal.

3. An underwater acoustic communication device, characterized in that, The underwater acoustic communication device is applied to a transmitting end, which includes eight transmitting sources arranged in a first equally spaced circular phased array, comprising: The acquisition module is used to acquire the first communication data; A low-density parity check code encoding module is used to encode the first communication data using a low-density parity check code to obtain encoded data. A carrier modulation module is used to perform carrier modulation on the encoded data to obtain a first modulation signal, wherein the carrier modulation includes amplitude modulation, frequency modulation or phase modulation; An acoustic orbital angular momentum modulation module is used to perform acoustic orbital angular momentum modulation on the first modulation signal to obtain a second modulation signal. The process of performing acoustic orbital angular momentum modulation on the first modulation signal to obtain the second modulation signal includes: assigning different initial phases to each of the first modulation signals according to a preset order; applying an excitation signal to each of the first modulation signals to obtain the second modulation signal; wherein, based on the order of the acoustic orbital angular momentum and the number of the transmitting sources, calculating the initial phase difference between two adjacent first modulation signals, the initial phase difference being equal to 2π divided by the number of transmitting sources and then multiplied by the order; determining any one of the transmitting sources as the first transmitting source; assigning a preset initial value to the initial phase of the first modulation signal of the first transmitting source; and adding or subtracting the preset initial value and the initial phase difference to obtain the initial phase of the first modulation signal corresponding to the transmitting source adjacent to the first transmitting source. The signal transmission module is used to transmit the second modulated signal to the receiving end through the underwater acoustic channel, wherein each transmitting source of the transmitting end is driven to generate a vortex acoustic beam corresponding to the second modulated signal, and the vortex acoustic beam is transmitted to the receiving end through the underwater acoustic channel.

4. An underwater acoustic communication method, characterized in that, The underwater acoustic communication method is applied at a receiving end, which includes eight receiving sources arranged in a second equally spaced circular phased array, and includes the following steps: The receiver receives a second modulated signal transmitted by a transmitter. The transmitter encodes first communication data using a low-density parity-check code to obtain coded data, performs carrier modulation on the coded data to obtain a first modulated signal, and performs acoustic orbital angular momentum modulation on the first modulated signal to obtain a second modulated signal. The carrier modulation includes amplitude modulation, frequency modulation, or phase modulation. The step of performing acoustic orbital angular momentum modulation on the first modulated signal to obtain the second modulated signal includes: assigning different initial phases to each of the first modulated signals according to a preset order; applying an excitation signal to each of the first modulated signals to obtain the second modulated signal; wherein, based on the order of the acoustic orbital angular momentum and the number of transmitters in the transmitter, the initial phase difference between two adjacent first modulated signals is calculated, the initial phase difference being equal to 2π divided by the number of transmitters and then multiplied by the order; any one of the transmitters is designated as the first transmitter; a preset initial value is assigned to the initial phase of the first modulated signal of the first transmitter; the preset initial value and the initial phase difference are added or subtracted to obtain the initial phase of the first modulated signal corresponding to the transmitter adjacent to the first transmitter. The second modulation signal is demodulated by acoustic orbital angular momentum to obtain a demodulated signal; The demodulated signal is digitally demodulated to obtain the data to be decoded; The data to be decoded is decoded using a low-density parity-check code to obtain the second communication data.

5. The underwater acoustic communication method as described in claim 4, characterized in that, The step of digitally demodulating the demodulated signal to obtain the data to be decoded includes: The demodulated signal is demodulated using quadrature phase shift keying (QPSK) to obtain the data to be decoded.

6. An underwater acoustic communication device, characterized in that, The underwater acoustic communication device is applied at the receiving end, which includes eight receiving sources arranged in a second equally spaced circular phased array, comprising: A signal receiving module is used to receive a second modulated signal transmitted by a transmitter; wherein the transmitter encodes first communication data using a low-density parity-check code to obtain coded data, performs carrier modulation on the coded data to obtain a first modulated signal, and performs acoustic orbital angular momentum modulation on the first modulated signal to obtain a second modulated signal; the carrier modulation includes amplitude modulation, frequency modulation, or phase modulation; wherein performing acoustic orbital angular momentum modulation on the first modulated signal to obtain the second modulated signal includes: assigning different initial phases to each of the first modulated signals according to a preset order, and adjusting the initial phase of each of the first modulated signals... An excitation signal is applied to the control signal to obtain a second modulation signal. The initial phase difference between two adjacent first modulation signals is calculated based on the order of the acoustic orbital angular momentum and the number of transmitting sources in the transmitting end. This initial phase difference is equal to 2π divided by the number of transmitting sources and then multiplied by the order. Any one of the transmitting sources is designated as the first transmitting source. A preset initial value is assigned to the initial phase of the first modulation signal of the first transmitting source. The preset initial value and the initial phase difference are added or subtracted to obtain the initial phase of the first modulation signal corresponding to the transmitting source adjacent to the first transmitting source. The acoustic track angular momentum demodulation module is used to perform acoustic track angular momentum demodulation on the second modulation signal to obtain a demodulated signal; A digital demodulation module is used to digitally demodulate the demodulated signal to obtain the data to be decoded; The low-density parity check code decoding module is used to perform low-density parity check code decoding on the data to be decoded to obtain the second communication data.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the steps of the underwater acoustic communication method according to any one of claims 1 to 2 or 4 to 5.

8. An underwater acoustic communication system, characterized in that, The underwater acoustic communication system includes a transmitter and a receiver, wherein... The transmitting end is used to perform the steps of the underwater acoustic communication method according to any one of claims 1 to 2; The receiving end is used to perform the steps of the underwater acoustic communication method according to any one of claims 4 to 5.

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