23results about How to "Reduce bit error rate" patented technology

This invention discloses an underwater acoustic anti-interference transmission method and system based on sparse time-frequency feature mapping. The method includes: at the transmitting end, adaptively generating a fractional-order linear frequency-modulated waveform with a specific time-frequency shear slope based on the Doppler state of the underwater acoustic channel, achieving physical-layer focusing of transmitted energy; at the receiving end, constructing a hybrid observation model containing wide-block sparse channel components and narrow-block sparse burst noise components, and using a dual-channel variational Bayesian algorithm to jointly iteratively infer the posterior probability distribution of environmental burst noise in the fractional-order domain; finally, recovering the original signal through soft-threshold interference cancellation and fractional-order channel equalization. This invention effectively solves the communication failure problem caused by high-dynamic Doppler diffusion and marine biological impulse noise interference in underwater acoustics by actively mapping the waveform and using heterogeneous sparse joint inference at the receiving end, significantly improving transmission reliability in harsh underwater acoustic environments.

This invention discloses a photonic terahertz communication system based on non-uniform probabilistic shaping, belonging to the field of terahertz communication. Specifically, it includes a transmitter and a receiver. The transmitter incorporates non-uniform probabilistic shaping and phase fuzzy encryption techniques, using photonic beat frequency generation to produce a terahertz signal. This signal is then transmitted wirelessly via single-mode fiber to the receiver, where it is mixed with a frequency-multiplied local oscillator signal to achieve down-conversion of the terahertz signal, obtaining an intermediate frequency (IF) signal. The IF signal is then sampled and input to an RX-DSP module for digital signal processing, ultimately obtaining the original data and calculating the bit error rate (BER). This invention improves the system's BER performance and significantly enhances the security of the photonic terahertz communication system.

The application discloses a CNN-LSTM-based phase calibration method for mode division multiplexing optical fiber communication and belongs to the technical field of optical fiber communication. By constructing a double-input CNN-LSTM hybrid neural network architecture, MIMO input signals and original target signals of mode division multiplexing optical fiber communication are acquired, data preprocessing is carried out, the spatial feature extraction capability of a convolutional neural network and the time series modeling capability of a long short-term memory network are combined, effective compensation of phase noise in long-distance strong coupling mode division multiplexing optical fiber communication is realized, complex MIMO signals are separated into real and imaginary parts and sliding window training samples are generated, and a double-branch network containing an image input layer, a convolutional layer, an LSTM layer, a deep connection layer and a self-defined phase calibration layer is constructed. The problems that the phase noise compensation capability of a traditional algorithm is limited and the convergence performance is poor under a strong coupling condition are effectively solved, and the equalization performance and transmission quality of a mode division multiplexing optical fiber communication system are significantly improved.

This invention belongs to the field of satellite navigation and communication technology, specifically relating to a method, program, device, and storage medium for optimizing satellite communication windows based on satellite navigation signal carrier-to-noise ratio (SNR) information in dynamic environments. For communication satellites with communication and navigation payloads on the same platform, this invention directly predicts the SNR time series. For communication satellites with communication and navigation payloads on different platforms, it uses known historical SNR and position information of the navigation satellite to calculate the motion state of the communication positioning terminal antenna, thereby indirectly predicting the future SNR sequence of communication satellites with unknown historical SNR. Based on the directly or indirectly predicted communication satellite SNR sequence, a suitable communication window for the communication satellite is found, reducing the bit error rate under adverse channel conditions. This invention achieves the prediction of SNR changes for satellites with unknown historical SNR.

The application discloses a kind of LDPC multi-bit quantization hardware decoding method suitable for high-speed communication, it is related to the field of communication physical layer digital signal transmission, including the steps 1) reset decoding module, from channel obtains the information sequence to be decoded and carries out suitable bit quantization extension;2) to meet the engineering demand of super high speed, low resource consumption, low latency, the application adopts a kind of full parallel decoding structure, the full parallel decoding structure can realize all check nodes update simultaneously and provide to all variable nodes.3) check node update is carried out by 6 parallel ways, the normalization factor used in the application check node update is obtained by adaptive mode;4) the check node information obtained in step 3 is as the input of variable node update module, variable node update is carried out by 6 parallel ways, the input in the application variable node update module is improved by expanding the number of bit quantization to improve the decoding ability of decoder.

A TFDM-PON system correction method and device, including OLT receiving ONU based on time division multiplexing or time-frequency division multiplexing sends double polarization signal, it includes target signal sequence corresponding with X / Y polarization, and target signal sequence is IQ period complex signal and its I road and Q road are single tone signal of first frequency and second frequency respectively;Based on the Fourier transform of double polarization signal and frequency domain symmetry, calculate target parameters including target transceiver frequency offset, target transmitting terminal, receiving terminal IQ delay and target power deviation between each ONU, make ONU correct frequency, delay and power according to target parameters, eliminate subcarrier crosstalk caused by frequency offset in TFDM uplink burst transmission, image crosstalk caused by IQ imbalance and performance degradation caused by subcarrier power imbalance, reduce bit error rate, improve system robustness.

The present disclosure relates to a method for MIMO transmission, wherein the method is performed by a terminal, and the method comprises: acquiring a residual transmission power and an uplink transmission quality of the terminal; and performing MIMO transmission in a transmission state determined from multiple candidate transmission states of the terminal according to the residual transmission power and the uplink transmission quality, wherein the multiple candidate transmission states include multiple transmission states with different uplink coverage capabilities. In the present disclosure, the uplink coverage capability of the terminal can be adjusted in time, the error rate of transmission can be reduced, and the transmission quality of MIMO transmission can be improved.

This invention provides a demodulation method and system for free-space optical communication links based on helical fractional orbital angular momentum. N data streams are loaded onto a Gaussian beam, and at least one modulated beam of helical fractional OAM (Optical Aspect-Oriented Motion) is generated through a spatial optical phase modulation module. After coaxial beam combining, the beam is emitted in free space and imaged onto the demodulation phase modulation module plane via an optical relay imaging system. A conjugate helical phase map is loaded to demodulate the target OAM, and the focusing optics module is adjusted to couple the peak of the target OAM beam into a single-mode fiber, while non-target OAM beams are isolated. After verifying the demodulation isolation, the demodulation phase map is switched to sequentially recover each data stream. This invention achieves hybrid multiplexing of helical fractional and integer OAM, and achieves a mode isolation of ≥5dB through a dual isolation mechanism of phase conjugate demodulation and spatial optimal focusing. This improves fiber coupling efficiency and communication link robustness, significantly expanding the channel capacity and spectral efficiency of free-space optical communication.

The purpose of this invention is to provide a method and apparatus for linear block code redundancy transmission. The method includes: setting the [n,k] values ​​of the linear block code, where n is the total number of codes and k is the number of baseband information codes; generating n groups of block codes; and filtering the n groups of block codes through program debugging to determine 2... k A block code with weak cross-correlation and strong autocorrelation is used to generate input information; the input information is modulated, transmitted, demodulated, and decoded to generate output information. The apparatus for linear block code redundancy transmission includes a transmitter and a receiver; the transmitter is equipped with an encoder and a modulator; the encoder includes a block code generator, a filtering module, and an information output module; the receiver is equipped with a demodulator and a decoder. This method and apparatus for linear block code redundancy transmission is simple to apply and can improve signal sensitivity.

The utility model provides a storage device with low delay characteristic, include: a plurality of selection transistor, a plurality of floating gate transistor, a plurality of floating gate transistor respectively with bit line and word line electric nature connection, wherein a plurality of floating gate transistor respectively with corresponding selection transistor electric nature connection, and with the form of storage unit integrated in same flash memory chip, and floating gate transistor includes control grid, source electrode and drain electrode, wherein control grid and word line electric nature connection, any electrode in source electrode or drain electrode is in floating state, and another electrode electric nature connection is in bit line, and main controller is electrically connected with host computer and flash memory chip, and according to the instruction random access any storage unit of host computer. The utility model can provide high density and high reliability storage space under the premise of not using error correction related technology.

This invention relates to the field of power equipment technology and discloses a non-contact live-line diagnostic method and system for zinc oxide surge arresters. A wireless test clamp with remote-controlled opening and closing function is deployed on the three-phase grounding lead of the surge arrester via an insulating rod, and a reference voltage acquisition module is deployed simultaneously. Dual wireless radio frequency modules are used to transmit sampling data in parallel, achieving synchronous acquisition and transmission of current and voltage signals. After receiving the data, the host computer performs filtering and FFT frequency domain analysis to extract the fundamental component and calculate characteristic parameters such as total current, resistive current, capacitive current, phase difference, and power loss. The state of each phase of the surge arrester is determined by preset thresholds, and a comprehensive diagnostic conclusion is output.

The present disclosure relates to a data sending method and device, electronic equipment and storage medium. The method comprises: in the scenario of uplink resource allocation exception, selecting a plurality of target subcarriers from a plurality of alternative subcarriers, the alternative subcarriers being subcarriers available for sending data, the number of the plurality of target subcarriers being less than the number of the plurality of alternative subcarriers; and sending data based on the plurality of target subcarriers. In the method, each target subcarrier has more power to support data sending, reducing the decoding failure of the network device, reducing the bit error rate, improving the data sending efficiency, avoiding the problems of resource waste and data flow interruption, and improving the user experience.

An OTFS secure transmission method, system, device, and medium based on integrated induction and frequency domain power allocation; the method involves generating an OTFS transmission frame X with signal-guide fusion. DD After OTFS modulation and up-conversion processing, the transmitted OTFS signal s is obtained. RF (t); Receive user-received OTFS signal s RF (t) and reflect to generate an echo signal. The transmitting end performs OTFS reception and demodulation on the echo signal to obtain the DD domain echo frame estimate of the DD domain channel impulse response; derives the optimal power allocation scheme in the TF domain under secure transmission conditions; builds a channel physical layer security analysis model; the system, equipment and medium are used to implement the method; this invention uses an integrated inductive and communication system based on OTFS modulation to estimate the DD domain channel impulse response using the echo signal, and performs optimal power allocation in the frequency domain through the channel impulse response, thereby improving the signal-to-noise ratio of the received signal and enhancing the security of information transmission.

The present application provides a kind of mud logging data transmission method, comprising the following steps: the frequency and amplitude of the interference signal of mud logging site are obtained;The frequency and amplitude of the interference signal are sent to central processing unit, central processing unit judges the communication frequency in current wireless communication module has been occupied by interference signal and automatically avoids interference frequency band, determines communication frequency, wherein the wireless communication module includes master node and slave node;Central processing unit sends the determined communication frequency to master node, and master node sends handshake information to slave node, and the handshake information includes the communication frequency determined by master node, after master node sends and master node receives successfully, master node and slave node are uniformly and automatically replaced to the communication frequency determined by master node.The present application can monitor and analyze interference situation in real time, can quickly adapt to the change of interference environment, ensure the stability of data transmission, reduce the delay and error rate of data transmission.

This invention discloses a waveform design and signal processing method for integrated OFDM radar communication based on ZC sequences, comprising the following steps: selecting ZC sequences as OFDM frequency domain coefficients for loading to obtain an OFDM radar transmission signal based on ZC sequences, and using a variable symbol interval phase mapping modulation algorithm to modulate the communication information to obtain an integrated OFDM radar communication waveform based on ZC sequences; then establishing a linear transmission and reception model based on the integrated radar communication system, and realizing zero-range sidelobe pulse compression and low bit error rate communication demodulation of the integrated OFDM radar communication signal based on ZC sequences according to the ZC-OFDM waveform pulse compression and variable symbol interval phase mapping demodulation algorithm.

The utility model discloses portable comprehensive multiplexing equipment with a multichannel transmission interface. The portable comprehensive multiplexing equipment comprises a power supply circuit, a master control MCU (Microprogrammed Control Unit), a serial port-to-parallel port circuit, a photoelectric conversion circuit and a signal shaping circuit, the power circuit provides stable power. The main control MCU receives and processes the signal and then outputs the signal; the serial port-to-parallel port circuit is connected with the main control MCU and an external LED lamp group, converts a serial port signal into a parallel port signal, and inputs the parallel port signal into the LED lamp group; the photoelectric conversion circuit receives an external optical signal, converts the external optical signal into an electric signal and transmits the electric signal to the main control MCU, and converts the electric signal output by the main control MCU into an optical signal for external transmission; the signal shaping circuit is connected with external equipment and outputs the input signal after shaping the input signal. According to the utility model, through the integrated design of multiple circuit modules, the functions of bidirectional conversion between serial ports and parallel ports and photoelectric signals and signal shaping are realized, multi-channel signal transmission and processing are supported, and the multi-scene requirements of LED control, optical communication and the like are met; the structure is compact and portable, and all modules work cooperatively to improve the stability and compatibility of signal transmission.

The present application relates to a coherent free space optical communication system expansion method, and belongs to the field of optical communication, which solves the problem of poor correction effect of existing systems under strong turbulence and mobile platform adaptability. The transmitting end adopts circular polarization SPPSK modulation, divides the static wavefront into N independent regions, each region maps bit information with orthogonal circular polarization state, generates a spatial polarization beam and sends it to the receiving end; the V-AO system of the receiving end adopts the EPSA-DE algorithm, generates control voltage through iterative optimization, and drives the correction element to jointly correct the phase and polarization aberrations caused by atmospheric turbulence; the corrected beam is mixed and demodulated to recover the original data. The present application does not need strict alignment between the transmitting end and the receiving end through circular polarization SPPSK modulation, is suitable for mobile platforms, and improves the correction effect and stability under strong turbulence through the EPSA-DE algorithm, significantly expanding the communication capacity of the system.

The utility model discloses a signal transmission processing circuit for electric eddy current position sensor, include: first operational amplifier, first negative feedback branch, positive feedback branch, first output unit, second operational amplifier, second negative feedback branch, second output unit, first negative feedback branch links with the noninverting input end, output end of first operational amplifier, and first output unit links with the output end of first operational amplifier, and positive feedback branch links with the noninverting input end of first operational amplifier, first output unit, second negative feedback branch links with the noninverting input end, second end, output end of second operational amplifier, the utility model discloses a signal transmission processing circuit for electric eddy current position sensor, through with the voltage of differential signal converts for the transmission of current, utilizes the low sensitivity of current signal to common mode interference, effectively reduces the generation of common mode current to reduce common mode radiation.

The application discloses a kind of enhanced deep residual neural network receiving methods for non-orthogonal superimposed pilot transmission, belong to wireless communication technical field.For the coupling interference problem caused by pilot and data high overlap in non-orthogonal superimposed pilot system, a receiver architecture based on physical feature reconstruction and residual network optimization is proposed.The method comprises: extracting the amplitude and phase characteristics of the received signal and the pilot by amplitude-phase conversion operator, respectively, and splicing to construct a multi-dimensional input feature map;Nonlinear mapping is carried out using a cascaded 6-layer enhanced residual convolutional network, wherein the frequency coherence between subcarriers is captured by expanding the time-frequency domain receptive field using dilated convolution, and the key features are adaptively weighted using squeezing and excitation modules;Finally, the bit-level log-likelihood ratio estimate is output, and the original bits are recovered by decoding.The application is suitable for high-speed dynamic scenarios, has less parameters and low complexity, can efficiently demodulate under complex interference multi-stream transmission, and meets the demand of 6G high spectral efficiency.

This invention discloses a dynamic spectrum allocation and multi-path collaborative transmission communication method and system for unmanned platforms. The method involves: first, real-time scanning of the operating frequency band, synchronously collecting signal strength and interference types of the target frequency band, generating a spectrum occupancy heatmap, and classifying interference signals; then, generating an availability probability map of each sub-channel within a future time window to predict the spatiotemporal distribution of interference sources; next, constructing a deep reinforcement learning (DRL) model to achieve dynamic allocation of transmission resources; finally, when the detected interference intensity exceeds a preset threshold, activating a multi-band, multi-path concurrent transmission and network coding mechanism, with the main path using a low-frequency band to ensure coverage, and the backup path using a high-frequency band to ensure rate. The receiving end processes the received data using a confidence-weighted fusion algorithm. The system includes a spectrum sensing module, a decision engine, and a multi-path transmission module. This invention improves communication efficiency and anti-interference performance, is highly adaptable, flexible in deployment, and has good scalability.

This invention discloses a space-frequency adaptive iterative anti-interference method for 5G terminals, comprising the following steps: In the 5G terminal, multiple antennas are used to receive downlink PBCH / PDCCH signals, and each time slot signal of each antenna is processed by FFT to obtain multiple signals in the frequency domain; the frequency domain is divided into multiple sub-bands, and beamforming processing for the first space-frequency anti-interference is performed; the beamformed signal is used to perform channel estimation and channel equalization using known pilot signals, and the equalized signal is demodulated; the demodulated signal is modulated, and the frequency domain is divided into multiple narrower sub-bands; the spatial domain anti-interference weighting coefficients are calculated using all signals in the sub-bands after the first anti-interference synthesis, demodulation, and modulation; the multiple signals of each sub-band are synthesized for anti-interference, and transformed to the time domain by IFFT to obtain the final anti-interference output signal. This invention also discloses a corresponding storage medium and device. Implementing this invention can reduce the computational load and bit error rate.

This invention provides an adaptive coding and modulation method for satellite communication based on link quality estimation, relating to the field of satellite communication. The method includes the following steps: Step S1: The transmitter generates and transmits a physical layer frame containing a pilot sequence; the receiver receives the physical layer frame and extracts the pilot sequence from it, estimating the mean and variance of the channel signal-to-noise ratio (SNR) based on the extracted and transmitted pilot sequences; Step S2: Based on the mean and variance of the channel SNR estimated in Step S1, the receiver queries a preset joint decision table to determine the coding and modulation scheme and pilot insertion frequency for the next frame, and feeds this information back to the transmitter to adjust the transmission strategy. This invention achieves optimal combined system throughput and reliability performance even when the channel state changes rapidly.

This invention discloses a BeiDou communication terminal with an RJ45 network interface, belonging to the field of BeiDou terminal equipment technology. The BeiDou communication terminal includes a BeiDou positioning circuit, a BeiDou communication circuit, a microcontroller processing circuit, a serial-to-RJ45 converter circuit, and a power management circuit. The BeiDou positioning circuit receives BeiDou positioning signals and outputs positioning data. The BeiDou communication circuit receives and transmits BeiDou short message data. The microcontroller processing circuit is connected to the BeiDou positioning circuit, the BeiDou communication circuit, and the serial-to-RJ45 converter circuit, respectively, to parse, group, and forward the positioning data and short message data. The serial-to-RJ45 converter circuit converts serial port data into RJ45 interface data and converts data input from the RJ45 interface back into serial port data. This terminal, while retaining BeiDou positioning and short message communication capabilities, adds an RJ45 network interface, enabling access to shipboard local area networks and improving upon the problems of short transmission distance, insufficient anti-interference capabilities, and limited connectivity with network devices in existing terminals.