398 results about "Coded modulation" patented technology

The invention discloses an HPLCamp (High Performance Liquid Chromatography) based on deep learning. The invention discloses an HRF dual-mode communication adaptive coding modulation and anti-noise method. The method comprises the following steps: acquiring an optical radio frequency signal amplitude-phase change rate and synchronously sampling and normalizing; calculating a node amplitude-phase residual error to generate a nonlinear mapping coefficient; monitoring coherent change to solve a drift trend, adjusting a modulation coding optimization scheme, compensating distortion and outputting an anti-noise result. According to the method, the instantaneous amplitude and phase of the optical radio frequency dual-mode signal are extracted, a multi-dimensional amplitude-phase characteristic matrix is formed in combination with time domain synchronization and a normalization template, differential residual modeling and nonlinear mapping coefficient calculation are carried out between impedance nodes, and dynamic compensation of amplitude-phase mismatch and envelope offset is achieved. A drift trend quantity is generated based on coherent offset parameter differentiation, feedback is provided for modulation format and coding strategy optimization, amplitude equalization and phase correction are completed, the signal synchronization degree and amplitude-phase consistency are improved, and the steady-state response and anti-disturbance performance of a transmission link are enhanced.

The invention provides a rising and falling control method and system for a PCM audio sampling rate, and belongs to the technical field of audio processing, and the method comprises the following steps: obtaining audio signal features of pulse code modulation PCM audio data, the audio signal features comprising spectrum energy distribution, instantaneous power, a signal-to-noise ratio and a peak-to-average ratio; monitoring hardware state parameters of the Bluetooth audio equipment in real time, wherein the hardware state parameters comprise a current representative processor load rate, a bandwidth occupancy rate and a current coding and decoding mode parameter; according to the predicted value of the target sampling rate, performing resampling processing on the PCM audio data by adopting a filtering processing method and an interpolation algorithm to obtain PCM audio data matched with the target sampling rate; the resampling processing comprises up-sampling processing or down-sampling processing; and inputting the PCM audio data matched with the target sampling rate to an audio output module of the Bluetooth audio equipment for playing. The audio quality, the computing resources and the transmission efficiency are optimized through self-adaptive resampling processing.

The invention relates to the technical field of microwave communication, and discloses a microwave communication data transmission method, which comprises the following steps: S1, sensing real-time rainfall intensity and atmospheric turbulence intensity parameters through combination of a multi-band radar and a meteorological sensor; s2, establishing a fractional order random channel model of a rainfall and turbulence coupling effect; s3, generating a dynamic coded modulation control strategy based on deep fractional order reinforcement learning; s4, optimizing a programmable metasurface reflection coefficient matrix according to the dynamic coded modulation control strategy and a channel state to reconstruct an electromagnetic propagation path; s5, executing power-codebook joint optimization of space-time coding and non-orthogonal multiple access; and S6, the system stability is monitored on line, and a degradation fault-tolerant mechanism is triggered. According to the invention, a Ku / W dual-band radar and meteorological sensor variational Kalman fusion technical scheme is adopted, and compared with a single-band radar or sparse meteorological station isolated observation scheme in the prior art, the problem of signal sudden drop misjudgment in a rainstorm scene is solved.

The invention relates to the field of data processing, in particular to an intelligent electric meter data optimization storage method, which comprises the following steps of: performing normalization, smoothing and abnormal value processing on multi-dimensional time series data such as electric energy, current, voltage and power; performing periodic analysis on time sequences of power, voltage, current and the like by using an autocorrelation function, and determining periodic intensity of the data; and finally, performing compression processing on the data through pulse code modulation (PCM), differential pulse code modulation (DPCM) and Huffman coding, thereby effectively improving the data compression rate, reducing redundancy, and ensuring optimization of data transmission efficiency and storage space. According to the invention, the ammeter data is compressed through periodic analysis and Huffman coding, so that the storage efficiency and the transmission efficiency are improved.

The invention relates to a computing power resource dynamic scheduling method, device and equipment based on deep reinforcement learning and a medium thereof, and the method comprises the steps: constructing a joint state vector through real-time fusion of a network layer channel state and computing layer node load data, and driving a strategy network to generate transmission parameters and resource allocation actions of cooperative control; the code modulation parameters of the wireless transmission module and the computing resource proportion of the target node are synchronously configured in the execution layer, and dynamic task scheduling in the channel decay environment is achieved; a multi-target reward mechanism is designed to couple transmission bit error rate penalty, resource utilization efficiency and task timeliness evaluation indexes, and a reinforcement learning agent is guided to balance communication stability and computing power demand conflicts; according to the method, strategy network parameters are optimized through time difference errors, closed-loop feedback is formed in combination with channel state prediction and node load updating, the problems of network and calculation layer splitting decision, insufficient dynamic adaptability and multi-target optimization imbalance in the prior art are effectively solved, and the task scheduling success rate in the time-varying wireless environment is improved.

The invention discloses an LEO satellite power distribution and association method and system based on a cellular-free architecture in the technical field of wireless communication, and the method comprises the steps: carrying out the maximum ratio transmission precoding of all satellite access points, and generating a coding modulation signal; after the target users receive the coded modulation signals, receiving signals are formed at a receiving end, and the signal-to-interference ratio and the downlink transmission rate of each target user are calculated through the receiving signals; accumulating downlink transmission rates of all target users through a central satellite, and calculating system energy efficiency in combination with total power consumption of all satellite access points; and constructing an objective function with maximization of the system energy efficiency, solving the objective function through an iterative optimization algorithm under the constraint condition of a satellite transmitting power upper limit and a user-satellite coverage relationship, and determining an optimal power allocation and user-satellite association scheme. The method can adapt to the high-speed motion characteristic of the LEO satellite, and the system energy efficiency and the resource utilization rate are remarkably improved.

The invention discloses a hydroelectric power station state monitoring communication method, system and device and a medium, and the method comprises the steps: carrying out the channel attenuation prediction through employing an integrated learning algorithm, and obtaining a channel attenuation prediction result; based on a channel attenuation prediction result, communication parameter optimization is carried out through a control optimization algorithm, and the optimal transmitting power and coding modulation scheme are obtained; analyzing through a deep learning framework to obtain a communication traffic prediction result; dynamically adjusting resource allocation of each service flow through a bandwidth allocation strategy based on a communication flow prediction result to obtain optimized bandwidth resource allocation; through the configuration instruction, the communication parameter setting is dynamically adjusted, and the fine management of the communication system is realized. The satellite communication system of the hydropower station is more reliable and efficient, and better support is provided for operation management of the hydropower station.

The invention discloses a multi-channel comprehensive processing platform based on a VPX framework, and relates to the technical field of terminal equipment. The system comprises a backboard, and two power supply modules, N signal processing modules, two master control switching modules and a clock interface module which are carried on the backboard, the backboard realizes module signal interconnection and MARK address setting; the power supply module supplies power to each module; the clock interface module provides timing information for each module and completes level conversion between the master control exchange module and an external equipment information data interface; the master control exchange module completes information data processing, receives a remote control instruction of the upper computer, forwards the remote control instruction, summarizes state information of each module and transmits the state information to the upper computer, and the network exchange capability realizes remote debugging and program updating of each module and completes reporting of health information of each module; and the signal processing module carries out signal processing such as coding modulation or demodulation decoding on the information data. According to the invention, the architecture and interconnection interfaces of multiple types of modules are uniformly specified, and the reusability and universality of the platform and hardware are effectively improved.

The invention discloses a peak code modulation circuit based on a dynamic memristor, which comprises the dynamic memristor and a signal conversion module, and is characterized in that the signal conversion module comprises a signal isolation module, a feature extraction module and a pulse conversion module which are connected in sequence. The dynamic memristor generates a voltage signal with a slow-rising and steep-falling characteristic under constant current input. The signal isolation module comprises a high-impedance input buffer circuit; the feature extraction module comprises an asymmetric time constant signal processing circuit used for performing enhanced extraction on the steep drop feature of the memristor output signal; and the pulse conversion module comprises a dual-threshold positive feedback hysteresis comparison circuit and is used for converting the output signal of the feature extraction module into a rectangular digital pulse. The circuit is specially designed according to the characteristics of the memristor, is simple in structure, is easy to integrate, can achieve the efficient conversion from an analog signal to a standard digital pulse, and is suitable for the fields of neuromorphic calculation and low-power-consumption signal processing.

The present invention provides a digital full-bandwidth direct-forwarding radar transponder system and its working method, which proposes a brand-new radar transponder system architecture and a corresponding new Morse code recognition scheme. The system of the present invention adopts a direct-forwarding system architecture, which combines digital broadband DRFM real-time forwarding technology and a line-replacing-by-point coding response architecture. The transmitting and receiving antennas are independent and work simultaneously, directly and indiscriminately encoding and forwarding all radar interrogation signals within the working frequency band, achieving Morse coding of the response information while retaining the complete waveform information. The system of the present invention can be equivalent to a target with special target characteristics. When the radar signals within the working frequency band irradiate this target, echo signals with specified Morse code modulation characteristics will be generated.

The invention discloses a low-complexity MSK coded modulation system phase synchronization receiving system and method, and relates to the technical field of continuous phase modulation. On one hand, an original message is coded and modulated by constructing a pre-coding mode, a receiving end realizes optimal sampling point extraction at the minimum intersymbol crosstalk moment after phase decoupling frequency conversion processing, MSK is converted into BPSK-like modulation, oversampling processing is not needed, modulation phase components of a receiving synchronization section can be offset, and the modulation efficiency of the receiving synchronization section is improved; therefore, accurate estimation of Doppler phase and frequency is realized, and the anti-Doppler capability is improved. On the other hand, coherent demodulation soft information is directly output after the real part of the signal subjected to Doppler frequency offset and phase offset compensation is obtained, the complexity of the demodulation algorithm is low, the performance of the demodulation algorithm is equivalent to that of BPSK, the demodulation algorithm is remarkably superior to that of an MSK optimal demodulation receiver in a low signal-to-noise ratio region, and the demodulation algorithm is particularly suitable for a bit interleaving coding modulation system combined with channel coding and has a wide application prospect. And reliable transmission under a low signal-to-noise ratio can be realized.

The invention discloses a self-adaptive coding modulation method and system for relieving sun-borne interference in an ultra-dense low-orbit satellite network, and aims to improve the reliability and the spectrum utilization rate of satellite network communication. The method specifically comprises the following steps: modeling satellite-ground and inter-satellite communication links of the ultra-dense low-orbit satellite network, and modeling and calculating time generated by the sun and interference to the low-orbit satellite network; the ground station estimates and predicts the satellite-ground channel state, and returns the predicted SNR to the satellite; and according to the SNR returned by the ground station and the SNR generated by the sun, a deep reinforcement learning method is adopted to select a coding modulation scheme to perform downlink data transmission, and whether a lower satellite is selected to perform data unloading and then transmit the data to the ground station is determined. Simulation results show that the bit error rate of the ultra-dense low-orbit satellite network can be effectively reduced, the spectrum utilization rate can be remarkably improved, real-time response and efficient resistance to sun interference can be achieved, the satellite calculation load can be reduced, the comprehensive performance of the system can be improved, and the method has high practical application value.

The invention discloses a cross-satellite communication method for a high-dynamic terminal. The cross-satellite communication method comprises the following steps: a satellite carries out bidirectional communication with a terminal and a terminal control station; the satellite forwards terminal service information to the terminal control station, and forwards terminal control station preset information and signaling information to the terminal; according to the preset information and the signaling information, the terminal dynamically judges whether cross-satellite switching needs to be initiated or not; if cross-satellite switching needs to be carried out, the terminal changes parameters according to the content of the signaling information to realize communication with a target satellite, and the target satellite forwards terminal service information to a terminal control station; meanwhile, terminal state information is updated and sent to the terminal control station, and the whole cross-satellite communication process is completed. According to the invention, on the premise of ensuring continuous and reliable cross-satellite communication, the cross-satellite communication process is simplified, and a self-adaptive coding modulation mode is adopted in an uplink, so that cross-satellite rapid switching and efficient communication of the high-dynamic terminal in a satellite networking scene are realized.

The invention belongs to the technical field of commercial inventory management, and discloses a store inventory commodity management and search system based on RFID induction, and the system comprises the steps: collecting a phase change time sequence of candidate RFID tags at high frequency when a user executes a moving operation; before matching, analyzing actual motion characteristics of a user according to instantaneous frequency of a sequence, and performing dynamic normalization processing on a time axis; and when a plurality of targets exist in a matching result, further performing coded modulation on the transmitting power of the reader and analyzing the relevance of echo response to finish the final uniqueness arbitration. A traditional mode of probabilistic judgment depending on signal instantaneous quantity is converted into a deterministic inventory management process based on dynamic process feature confirmation, so that the problem of uncertainty of inventory searching and checking caused by commodity density and signal instability in a commercial environment is solved.

The invention discloses a multipath effect suppression method for 2.4 GHz radio frequency identification. The multipath effect suppression method comprises a transmitting end processing flow and a receiving end processing flow. A transmitting end carries out pulse code modulation on an analog signal to obtain a digital signal, blocks the digital signal after channel coding, and distributes the digital signal to subcarriers through quadrature amplitude modulation; and generating a time domain OFDM symbol through IFFT (Inverse Fast Fourier Transform), adding a cyclic prefix and a synchronization head, converting into an analog baseband signal, and performing up-conversion, filtering, amplification and radiation. The receiving end amplifies the signal, down-converts the signal to a baseband, filters the signal and converts the signal into a digital signal; the method comprises the following steps of: synchronizing header frame alignment, recovering a coding bit stream through FFT (Fast Fourier Transform) and QAM (Quadrature Amplitude Modulation) demodulation, carrying out CRC (Cyclic Redundancy Check) after decoding and merging, returning ACK (Acknowledgement Character) if According to the method, the multipath effect can be effectively inhibited, and the integrity of received data is improved.

The present invention proposes a digital full-wideband direct forwarding search and rescue radar transponder system, which proposes a new search and rescue radar transponder (SART) system architecture and a corresponding new coding and reading scheme. The system of the present invention adopts a direct forwarding system architecture, which combines digital broadband DRFM real-time forwarding technology and discontinuous point coding response architecture. The transmitting and receiving antennas work independently and simultaneously, and all radar interrogation signals within the working frequency band are directly encoded and forwarded indiscriminately, retaining the complete waveform information while realizing the encoding of the response information. The system of the present invention can be equivalent to a target with special target characteristics. After the radar signal within the working frequency band is irradiated to the target, an echo signal with fixed coding modulation characteristics will be generated.

The invention provides a coding modulation method and a related device, and the method comprises the steps: carrying out the coding of N input bit sequences through employing code rates corresponding to the N input bit sequences, and obtaining N coded bit sequences corresponding to the N input bit sequences; the length of each input bit sequence is determined according to at least one of a code rate, a modulation order or the number of resource elements (RE) used for data transmission corresponding to the input bit sequence; the N coded bit sequences are mapped to the same constellation diagram, the constellation diagram comprises M constellation points, each constellation point comprises N segmented bits, and the N segmented bits correspond to the N coded bit sequences respectively. According to the process, the transmission efficiency is guaranteed, the coding complexity of the sending end is reduced, in addition, the protocol modification degree is also reduced, and the coding implementation cost is further reduced.

The invention relates to the technical field of signal transmission, in particular to a wireless while-drilling pulse signal transmission system under a high-temperature condition. The system comprises a signal generation part, a signal transmission part and a signal receiving part, the signal generation part is used for sensing changes of temperature, pressure or vibration of an underground environment through a piezoelectric crystal, generating an initial electric signal, forming a mechanical signal and converting the mechanical signal into an initial pulse signal in an electric signal form again; the signal transmission part is used for performing mud pressure modulation on the initial pulse signal to obtain a phase change function; performing nonlinear correction to obtain a correction result; performing signal coding modulation based on the correction result; the modulation signal is sent to a signal receiving part at a far end; and the signal receiving part is used for receiving the modulation signal and demodulating the modulation signal to obtain a demodulated output signal. A complete, efficient and reliable solution is provided for wireless while-drilling pulse signal transmission under the high-temperature condition.

The invention discloses a multi-frame reconstruction multispectral imaging system based on dynamic space-time joint coding. The system comprises a filtering window module used for limiting the spectral range of imaging; the spatial code modulation module is used for providing spectral codes in a spatial dimension; the time coding modulation module is used for carrying out inter-frame modulation on the spectrum codes provided by the space coding modulation module; the optical imaging module is used for imaging the light field modulated by the time coding modulation module on the color acquisition module; the color acquisition module is used for carrying out further spectral coding on the light field to obtain a measurement image; a calculation reconstruction module; the method is used for recovering a high-dimensional multispectral image data cube by using a measurement image. The method has the advantages of being light in weight, low in cost, high in underqualitative relieving capacity, efficient and stable in reconstruction method, high in adaptability and practicability and the like.

A UE that includes one or more non-transitory computer-readable media storing one or more computer-executable instructions for determining the number of coded modulation symbols for Uplink Control Information (UCI) in a Physical Uplink Shared Channel (PUSCH) transmission and at least one processor coupled to the non-transitory computer-readable media is provided. The processor is configured to execute the one or more instructions to cause the UE to determine that an Orthogonal Cover Code (OCC) is applied to the PUSCH transmission based on an indication received from a base station (BS) and determine the number of coded modulation symbols for the UCI based on the determination that the OCC is applied to the PUSCH transmission and a parameter received from the BS.

Disclosed are a transceiver decoding method and system based on protograph differential chaos shift keying (DCSK), the method including acquiring an information bit sequence, performing a coded modulation on the information bit sequence via a protograph DCSK transmitter, and outputting a plurality of modulated symbols; inputting each modulated symbol into a wireless channel for channel interference, and outputting a received symbol corresponding to each modulated symbol; using a target extrinsic information-aided network to determine a target a-posteriori probability vector corresponding to each received symbol; inputting each target a-posteriori probability vector into an a-priori calculation decoder for decoding, and outputting an initial decoded bit sequence; and determining a target decoded bit sequence according to the initial decoded bit sequence and a preset check matrix. The technical problem of lower decoding accuracy caused by the existing transceiver decoding methods designed for a DCSK system is solved.

The invention discloses a self-adaptive coding modulation method, device and equipment and a storage medium, and relates to the technical field of communication, the method is based on the time delay characteristic of satellite communication, an ACM scheme based on satellite communication is improved from the two aspects of channel estimation and MCS selection, channel state prediction is added in a channel estimation module, and channel state prediction is carried out on the ACM scheme based on satellite communication. A more accurate channel state value is obtained, the time-varying characteristic and the synchronous time delay characteristic of a satellite communication channel are comprehensively considered, an MCS switching algorithm based on variance correction is improved in the aspect of the MCS switching algorithm, a reference channel state threshold value is corrected by using a correction factor, and the accuracy of the channel state value is improved. According to the method, the MCS mode more conforming to the current communication environment is selected based on the corrected reference channel state threshold value, the satellite communication performance is improved, satellite and link resources can be saved, the system throughput rate and the system performance can be well balanced, and therefore the system has good robustness.

The invention discloses a self-adaptive link control method for a multi-dimensional identification system, and belongs to the technical field of link control. The method comprises the following steps: embedding an environment sensing module in a multi-dimensional identification system to obtain network state information; introducing a reinforcement learning algorithm to carry out adaptive coding; the self-adaptive waveform is realized through discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT); a self-adaptive waveform is realized through discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT); and establishing a link layer frame format of the multi-dimensional identification system to realize communication link management. According to the invention, through combination of a multi-dimensional identification system and an environment perception technology, a network state and channel characteristics can be perceived in real time, and a link control strategy is dynamically adjusted; the data transmission efficiency can be dynamically optimized according to the network state and the channel condition by introducing the adaptive coding modulation and adaptive waveform technology; the data transmission time delay is obviously reduced, and the data packet disorder and packet loss rate are reduced, so that the user experience is improved.

A method of video encoding includes performing context modeling to determine a context model for each of a number of bins of syntax elements corresponding to residues of a region of a transform skipped block in a current picture. The number of the bins of syntax elements being context coded does not exceed a maximum number of context coded bins set for the region. The method further includes encoding, according to Block Differential Pulse Code Modulation (BDPCM), the syntax elements based on the determined context models. When the maximum number of context coded bins is reached, remaining bins of syntax elements are encoded based on a bypass model.

The invention discloses a single-channel received RIS direction of arrival estimation method, and relates to the technical field of wireless sensing, and the method comprises the steps: mapping a space-time coding matrix into a control signal, and loading the control signal to periodically arranged electromagnetic units of an RIS, thereby carrying out the space-time coding modulation of an incident signal, and forming a reflection signal comprising angle information; receiving the reflected signal by a single-channel receiving end and converting the reflected signal into baseband data, performing Fourier transform on the baseband data to obtain a frequency domain component, and constructing a plurality of virtual receiving channels; and constructing a covariance matrix based on the signal of the virtual receiving channel, performing eigenvalue decomposition on the covariance matrix, constructing a spatial spectrum function, and performing peak search on the spatial spectrum function to obtain the direction of arrival of the incident signal. The invention further discloses a single-channel receiving RIS direction of arrival estimation system, high-precision direction of arrival estimation under the single-channel receiving condition is achieved, and the system has the advantages of being simple in system structure, low in hardware cost, high in algorithm resolution and high in anti-noise capacity.

The invention discloses a sweep frequency interference modeling and interference optimization method for a remote control data link of an unmanned aerial vehicle. The invention provides: 1) a transmitter-receiver adaptive modeling system based on unmanned aerial vehicle signal priori parameters; 2) an interference source generation system which comprises four modulation types of single-tone interference, random binary code modulation interference, PN code MSK interference and pulse interference and integrates two modes of stepping frequency sweeping and frequency hopping frequency sweeping; and 3) an interference strategy intelligent optimization system based on a particle swarm optimization algorithm. Performing similarity verification through DTW, and establishing a high-fidelity communication link model; connecting an interference source to a communication system by adopting a front door coupling mechanism, and constructing a bit error rate-oriented black box optimization model; and finally, carrying out mechanism analysis on an optimization result through a multi-dimensional interference effectiveness evaluation system. According to the method, an efficient interference parameter optimization scheme is provided for the unmanned aerial vehicle countering defense system, the optimization convergence speed is remarkably improved while the interference efficiency is guaranteed, and the method has important application value in the field of low-altitude security and protection.

The present application discloses a display device and an audio processing method, which receives an access signal sent by an external device that has been connected, and determines that the external device that has been connected supports the first sound effect processing when the access signal contains a first identifier that supports the first sound effect processing; determines that the external device that has been connected does not support the first sound effect processing when the access signal does not contain the first identifier that supports the first sound effect processing; and parses the audio file into pulse code modulation data when the external device that has been connected does not support the first sound effect processing and the first sound effect has been turned on, performs at least the first sound effect processing on the pulse code modulation data, and sends the processed pulse code modulation data to the external device to instruct the external device to play audio based on the processed pulse code modulation data. The use of this method can greatly enhance the spatial sound field effect of the output.

The invention discloses a programmable metasurface fault rapid diagnosis method based on orthogonal coding space-time modulation. The method comprises the following steps: step 1, applying independent orthogonal coding space-time modulation to each metasurface unit on a programmable metasurface to be diagnosed by adopting a time-varying signal based on orthogonal coding; 2, irradiating the programmable metasurface to be diagnosed by using a single-frequency plane wave; 3, receiving a reflection signal of the programmable metasurface to be diagnosed, and recovering each orthogonal coding channel energy from the reflection signal; step 4, according to the magnitude of the recovered orthogonal coding channel energy, determining a malfunctioning metasurface unit; when a certain unit breaks down, preset orthogonal coding modulation cannot be normally executed, so that a corresponding coding channel in a transmitting signal is lost, and therefore whether the unit corresponding to each coding channel breaks down or not can be judged by recovering energy distribution of each coding channel in a receiving signal, and accurate and efficient fault diagnosis is achieved.

The invention provides a plug-and-play single-pixel imaging method and system based on efficient mask sorting, and the method comprises the steps: enabling a spatial light modulator to load the efficient mask sorting, carrying out the coding, and then carrying out the measurement, thereby obtaining a measurement value in an image reconstruction process, and carrying out the iteration solving through a PnP-ADMM frame. The system comprises a coding modulation module, an information acquisition module and an image reconstruction module. A measurement value of the image reconstruction module in an image reconstruction process is coded by loading a high-efficiency mask sequence by a spatial light modulator of the coding modulation module and is measured by the information acquisition module; and optimization iteration is iteratively solved by a PnP-ADMM framework. Redundant sampling is reduced through efficient mask sorting, and the information acquisition efficiency is improved to the maximum extent; and high-quality decoding of low-sampling data is realized by further combining a plug-and-play algorithm with an advanced deep denoising network, high-quality image reconstruction is realized at an extremely low sampling rate, and meanwhile, the method has robustness to noise.

The invention relates to the technical field of underwater acoustic communication, in particular to an underwater high-speed underwater acoustic communication signal modulation and demodulation method based on multi-beam diversity, which comprises the following steps of: modulating at a transmitting end, generating a space-time coded modulation signal by adopting a multi-beam transducer array, and realizing space diversity by a receiving end through self-adaptive beam forming; modulation adopts a hybrid mode of combining orthogonal frequency division multiplexing and 256-QAM, and the spectrum efficiency is optimized through dynamic subcarrier allocation; and a receiving end demodulates, a three-dimensional compensation matrix is constructed based on an LSTM-CNN joint network, and joint estimation of channel impulse response and Doppler frequency offset is realized. According to the invention, by adopting an eight-unit cross array type multi-beam diversity technology, space signal focusing and multipath interference suppression tasks are completed, and the effect of spatial multiplexing gain is achieved; through combination of 256-QAM and OFDM dynamic subcarrier distribution, a high-spectrum-efficiency transmission task is completed; a time delay-Doppler joint estimation task is completed by constructing a three-dimensional compensation matrix of an LSTM-CNN joint network, so that the channel estimation error is reduced.