142 results about "Higher-order modulation" patented technology

The invention belongs to the technical field of signal processing, and particularly relates to a coherent light high-speed transmission signal processing method based on deep joint compensation, which comprises the following steps of: performing fine frequency offset and inter-carrier interference joint preprocessing on a coherent light receiving sampling sequence; obtaining a pre-processing output sequence and at least one estimation parameter derived from fine frequency offset and inter-carrier interference combined pre-processing; inputting the preprocessing output sequence into a diffusion type score guide joint compensation network module to obtain a deep joint compensation sequence; performing online judgment and decoding on the deep joint compensation sequence, and adaptively updating internal parameters of the diffusion type score guide joint compensation network module when a preset adaptive updating condition is met; according to the invention, the symbol residual error can be obviously reduced, the forward error correction gain can be improved, and the stability and robustness of the system under high-order modulation, high symbol rate and long-distance link scenes can be enhanced.

The invention relates to a voltage-mode high-speed transmitter fusing digital pre-distortion and serial driving. The voltage-mode high-speed transmitter comprises a time sequence control unit, a digital signal generation unit, a voltage modulation unit and an output matching unit, the digital signal generation unit is used for generating a pre-modulated digital signal in response to the first clock signal sent by the time sequence control unit; the voltage modulation unit is used for responding to a second clock signal sent by the time sequence control unit and sequentially performing low-speed serialization processing, retiming processing, differential processing and high-speed serialization-output driving processing on the pre-modulated digital signal to obtain a first high-speed level differential signal and a second high-speed level differential signal; and the output matching unit is used for performing impedance matching processing on the first high-speed level differential signal and the second high-speed level differential signal and outputting a corresponding first differential signal and a corresponding second differential signal. The device can be applied to high-order modulation and high-rate application scenes.

The invention provides a communication power amplifier digital pre-distortion nonlinear correction method and system, and the method comprises the following steps: obtaining input and output signal data of a power amplifier, and carrying out the preprocessing of the input and output signal data; according to the method, the memory polynomial and the LSTM neural network are combined, the memory-free nonlinearity and the long-term memory effect of the power amplifier are processed respectively, a physical modeling and data driving architecture is formed, compared with a single-model and high-bandwidth scene, the EVM is reduced by 40%, the ACLR is improved by more than 5dB, and the pre-distortion precision is improved; the RLS algorithm is optimized by adopting the genetic algorithm, and the optimal initial parameter is determined through global search, so that the problems of local optimum and slow convergence of the traditional RLS are solved, the convergence time is shortened from 50ms to 15ms or less, and the real-time requirement of high-speed communication is met; by designing a special algorithm for the two types of models, the memory polynomial parameter updating stability is improved by 30%, the neural network training speed is improved by two times, the overall efficiency is improved by 50%, and the method is suitable for high-order modulation and high peak-to-average ratio scenes.

The embodiment of the invention provides a high-order modulation signal group delay distortion compensation method and device based on sub-band decomposition, and the method comprises the steps: obtaining a received signal, extracting a target guide code, and calculating a signal-to-noise ratio estimation value; determining a signal sub-band decomposition number and a compensation filter length based on a predetermined signal decomposition parameter and a signal-to-noise ratio estimation value; decomposing the received signal based on the signal sub-band decomposition number to obtain at least four signal sub-bands; calculating a filter compensation coefficient of each signal sub-band based on the compensation filter length, and performing group delay compensation on each signal sub-band based on the compensation coefficient; according to the embodiment of the invention, fine compensation of different frequency components is carried out on group delay through sub-band decomposition, channel frequency response in the sub-bands is flatter, requirements for estimation errors and the length of a filter are reduced, and therefore the performance bottleneck of a global equalizer is avoided.

This invention discloses a method and apparatus for radio signal classification. The method includes: acquiring a raw dataset; training a signal classification model using the raw dataset to obtain an optimized signal classification model; acquiring radio signal data; and processing the radio signal data using the optimized signal classification model to obtain radio signal modulation information. This invention provides a radio signal classification method and apparatus that effectively identifies complex modulation signals using a signal classification model, improving the modulation recognition accuracy of high-order modulation signals. This is of great significance for ensuring the reliability and stability of communication systems.

Methods, systems, and devices for wireless communications are described that provide for a probabilistic shaping framework for higher-order modulations in which probabilistic shaping of modulation constellations is performed for two or more bits per constellation. A transmitting device may shape a set of information bits using a set of masking bits. The transmitting device may encode, shape, modulate, and transmit the set of information bits to a receiving device, and the receiving device may demodulate, deshape, and decode the received information bits. The transmitting device may transmit a set of shaping bits, which may be indicative of the set of masking bits. The receiving device may use the set of shaping bits to generate the set of masking bits, and may use the set of masking bits to deshape the information bits. Further, the transmitting device may provide an indication of a quantity of shaped bits per modulation symbol.

The invention discloses a high-speed data transmission high-order modulation compensation power amplifier linear distortion system, and belongs to the technical field of satellite high-speed data transmission. The system comprises a data processing module, a constellation mapping module, a shaping filtering module, a quadrature modulation module, a radio frequency up-conversion module, a power amplifier output module, a weighting parameter calculation module and a mapping correction module. Phase point analysis is carried out on a power amplifier output signal through a frequency spectrograph, constellation points after power amplifier compression are obtained and are compared with standard mapping phase points to generate correction parameters, then a mapping correction module is used for carrying out weighted adjustment on constellation mapping, and peripheral phase point amplitude compression caused by power amplifier saturation is compensated. According to the method, phase point distribution can be corrected through digital preprocessing under the power amplifier saturation working condition, linear distortion of high-order modulation signals is effectively improved, the power amplifier backoff amount is reduced, the power amplifier efficiency is improved, and the method is suitable for a non-amplitude balance high-order modulation scene in a satellite high-speed data transmission system.

Methods, systems, and devices for a framework for probabilistic shaping and channel coding for wireless signals are described to support a probabilistic shaping framework for higher-order modulations in which shaping and channel coding may be independent. A transmitting device may shape a set of information bits using a set of masking bits. The transmitting device may encode, shape, modulate, and transmit information bits to a receiving device, and the receiving device may demodulate, deshape, and decode the received information bits. In addition to transmitting the information bits to the receiving device, the transmitting device may also transmit a set of shaping bits, which may be indicative of the set of masking bits used to shape the information bits. The receiving device may use the set of shaping bits to generate the set of masking bits, and may use the set of masking bits to deshape the received information bits.

The invention discloses a dual-mode communication chip, and belongs to the technical field of communication. The dual-mode communication chip comprises an HPLC (High Performance Liquid Chromatography) signal transmitting end and an HPLC signal receiving end; the HPLC signal transmitting end is configured as a coding module and is used for coding the load data to obtain coded load data; the first storage module is used for storing the coded load data; the channel interleaving module is used for carrying out interleaving processing on the bit data read out from the first storage module; the first bit buffer queue is used for sequentially writing the bit data from the channel interleaving module according to a first bit number and sequentially reading the bit data according to a writing sequence according to a second bit number; and the bit mapping module is used for mapping the bit data from the first bit buffer queue to each subcarrier with a second bit number. According to the invention, rate efficient matching of data processing in a high-order modulation mode and data transmission without subcarrier cross-physical blocks are realized.

This invention provides an unmanned aerial vehicle (UAV) image transmission system and image transmission method. The system includes: a radio frequency (RF) transceiver, a balanced amplifier circuit, a low-noise amplifier, and an RF switch. The balanced amplifier circuit includes at least two parallel power amplifiers configured to superimpose the amplified signals from each power amplifier in phase to synthesize the output power. The RF transceiver generates a time-division duplex control signal to synchronously control the switching of each component between transmit and receive modes. By employing a balanced amplifier circuit, this invention enables each power amplifier to operate in a region with better linearity, thereby improving transmit power while ensuring the signal quality required for high-order modulation, thus balancing long-distance transmission and high-definition image quality.

A communication method, apparatus, and system are provided. An apparatus (such as a channel interleaver) can acquire a first coded bit sequence, wherein the first coded bit sequence is obtained by rate matching a second coded bit sequence; divide the first coded bit sequence into blocks; and perform channel interleaving on the blocks in a predefined order, wherein the channel interleaving is applied to the first coded bit sequence before modulation and transmission to the channel. The ability to divide the first coded bit sequence into blocks for channel interleaving enables block-level interleaving with higher parallelism, improving flexibility, simplifying operation, and achieving higher throughput, while also providing stable or better performance under high-order modulation or fading channels.

The invention discloses a Ka-band satellite high-speed data transmission system, which adopts a Ka-band high-order modulation same-frequency dual-polarization ground high-speed data transmission design, adopts a system design method of high-order modulation, high-speed digital shaping, passive filtering and same-frequency dual-polarization transmission, and supports a double-frequency-point four-channel high-speed transmission mode. The bandwidth occupied by the system spectrum is further compressed, the transmission efficiency of the system is doubled under the strict constraint condition that the international electric connection Ka frequency band ground transmission carrier frequency meets the 1.5 GHz system bandwidth of 25.5 GHz to 27 GHz, and the frequency band utilization rate of ground transmission is effectively improved.

The present invention relates to a digital pre-distortion method and pre-distortion system suitable for high-order QAM modulated signals. Taking a constellation diagram of mQAM modulated signals as an example, the constellation diagram of the mQAM modulated signals is divided according to different signal amplitudes, wherein signals having the same signal amplitude form one circle; the signals are then clustered by means of a fuzzy C-means clustering algorithm; the clustered signals are grouped into several categories, and each category of data corresponds to similar power amplifier behaviors; and after a sub-model is established for each category of signals, different digital pre-distortion sub-models are used for processing. A digital pre-distorter taking a memory polynomial as a model is employed to implement a pre-distortion function for the high-order modulated signals, so as to compensate for nonlinear distortion of the signals caused by a radio frequency power amplifier, wherein the digital pre-distorter uses a memory polynomial model. A pre-distortion parameter extraction algorithm uses a recursive least squares method. Compared with existing traditional digital pre-distortion methods, the whole design scheme has the advantage of lower error vector amplitude.

The invention discloses a training method of a signal monitoring model, a signal monitoring method and electronic equipment, and relates to the technical field of signal processing. A deep separable convolutional layer, a multi-scale parallel structure and a compression-incentive attention mechanism module are embedded in the signal monitoring model. The depth separable convolution layer firstly expands a feature channel space, the multi-scale parallel structure extracts multi-dimensional signal features at the same time, and the compression-excitation attention mechanism module strengthens effective features, so that feature requirements of more modulation types are covered, and the situation that only a single feature modulation format can be adapted is avoided; moreover, through deep aggregation of multi-scale features and feature enhancement of channel dimensions, richer deep transmission features can be extracted, complex features of high-order modulation signals can also be accurately captured and enhanced, the adaptability to high-order modulation format signals is improved, and thus, when the signal monitoring model is used for monitoring, the accuracy of the signal monitoring model is improved. The accuracy of signal transmission characteristic monitoring can be improved.

A method, apparatus, and computer program product for wireless communication are provided. The apparatus can enable selection of modulation order (Qm) parameters, transport block size (TBS) parameters, number of subframes in a transport block (NSF) parameters, etc. For example, at least in part based on receiving downlink control information or another factor, a user equipment can select a table of, for example, Qm, TBS, and NSF values, and can select a particular set of Qm values, TBS values, and NSF values from the table. In this way, the UE can use higher order modulation and coding schemes in, for example, narrowband Internet of Things deployments.

This invention provides an intelligent spectrum allocation method and system for adaptive signal-to-noise ratio (SNR) in C+L band optical networks, relating to the field of optical fiber communication technology. The method includes: initializing the C+L band elastic optical network and determining nodes, links, spectrum slots, and time slot resources; receiving service requests and clarifying the source node, destination node, time slot requirements, and capacity; calculating link weights based on transmission distance and spectrum occupancy, and selecting the optimal path; determining the modulation format based on path distance and calculating the required spectrum slots; allocating higher-order modulation to the C band and lower-order modulation to the L band; ensuring continuous spectrum slots and consistent links, otherwise the request fails; selecting the spectrum block with the highest OSNR for allocation, comparing the OSNR with a threshold, and determining whether the request is successful. This invention improves the transmission quality of service requests and enables more comprehensive and accurate resource allocation.

The invention belongs to the technical field of wireless communication, and particularly relates to a radio-over-fiber communication system based on I / Q frequency mixing and electro-optical modulation. The method specifically comprises the following steps: data passes through a digital-to-analog conversion module and an I / Q mixer to generate a radio frequency signal, and the radio frequency signal is transmitted by a transmitting end; a receiving end receives a radio frequency signal, and the radio frequency signal is down-converted into two paths of mutually orthogonal intermediate frequency I and Q signals to an electro-optical modulation and optical fiber link after passing through an I / Q mixer; the two paths of I and Q signals are respectively sent to an I / Q optical modulator and are used for driving the I / Q optical modulator, generating optical signals, mapping the optical signals to optical carriers, and sending the optical signals to a coherent receiver; the coherent receiver performs coherent receiving on the optical signal to generate a baseband signal, and the baseband signal is subjected to analog-to-digital conversion through the digital signal processing module; the device is suitable for microwave, millimeter wave, terahertz and satellite-ground communication scenes such as satellite-ground long-distance communication, deep space exploration and secret signal receiving, supports various high-order modulation formats, and has the advantages of high capacity, high sensitivity and high safety.

The invention provides a signal anti-interference method and device based on high-order modulation unequal error protection, and relates to the technical field of digital signal processing, and the method comprises the steps: obtaining a quadrature amplitude modulation symbol based on an original signal in an anti-interference communication system; performing uniform mapping on the quadrature amplitude modulation symbol to obtain a frequency hopping signal; obtaining a to-be-demodulated signal based on the frequency hopping signal; and determining the bit error rate of the communication system based on the to-be-demodulated signal. According to the signal anti-interference method based on high-order modulation unequal error protection provided by the invention, approximate uniform distribution of interference energy is realized through a bit interleaving coded modulation structure, effective interference suppression is carried out on the basis of guaranteeing spectrum efficiency, the robustness of a communication system in a strong interference scene is improved, and the signal anti-interference performance is improved. Therefore, the anti-interference performance of the communication system is improved.

The invention discloses an OTFS cross-domain iteration detection method and system based on a penalty term sharing alternating direction multiplier method, mainly solving the problem of poor performance in a high-order modulation scene in the prior art, and the scheme comprises the following steps: a sending end sends a time domain signal; a receiving end receives the sent signal and constructs a penalty term sharing maximum likelihood detection problem and an augmented Lagrange function about the received signal; solving a penalty term sharing problem by utilizing an alternating direction multiplier method to obtain time domain posterior information, and calculating out-of-time domain information by utilizing the time domain posterior information; information outside a time domain is converted to a time delay-Doppler domain through cross-domain message transmission, and time delay-Doppler domain prior information is obtained; and time delay-Doppler out-of-domain information is calculated and fed back to the time domain module. And repeating the steps of the receiving end until the covariance of the symbol to be detected is smaller than a certain threshold value or reaches the set maximum iteration times, thereby obtaining a final judgment bit. According to the method, good detection performance can still be kept in a high-order modulation scene, and the method can be used for recovering a transmitting signal from an OTFS system receiving signal.

This invention provides a method, apparatus, and terminal device for estimating transmitted signals, belonging to the field of wireless communication technology. The method includes determining a received signal vector, a channel matrix, and a noise variance; inputting the received signal vector, channel matrix, and noise variance into a signal estimation model to obtain an estimated transmitted signal value output by the signal estimation model; wherein, the signal estimation model is obtained by optimizing a minimum mean square error detector based on a Fourier transform algorithm and a pre-determined weighting factor, and the weighting factor is used to adjust the convergence step size. This invention uses the Fourier transform algorithm to replace matrix inversion in the minimum mean square error detector, avoiding explicit matrix operations, reducing computational complexity, and can be used in M-MIMO systems with large-scale antennas. Furthermore, adjusting the convergence step size based on the weighting factor is beneficial for stable convergence and prevents severe degradation of bit error rate performance under high-dimensional and high-order modulation conditions.

The invention discloses a 5G communication modulation signal identification method and system, and belongs to the technical field of signal identification, and the 5G communication modulation signal identification method comprises the steps of signal receiving, spatial feature separation, multi-domain feature extraction and feature fusion and identification. According to the invention, spatial spectrum estimation is carried out on the multipath beam superposition signals received by the MassiveMIMO array by using the MUSIC algorithm, efficient separation of N paths of independent beam signals is realized, and the technical problem that a traditional single-antenna model cannot adapt to a multi-antenna scene is thoroughly solved; according to the method, the sparse Transform model and the stacked self-organizing mapping are combined, accurate classification and proportion calculation of QPSK, 16QAM, 64QAM and 256QAM hybrid modulation signals are achieved, the recognition accuracy is larger than or equal to 92% when SNR = 0dB, the recognition accuracy is improved by more than 18% compared with a traditional algorithm, and the problems that high-order modulation constellation points are fuzzy and hybrid modulation classification is difficult are effectively solved.

The embodiment of the invention provides a signal processing method and device based on three-dimensional constellation mapping and electronic equipment, and the method comprises the steps: obtaining a binary serial bit stream, and converting the binary serial bit stream into a parallel bit stream; the parallel bit streams are mapped to a multi-layer three-dimensional constellation diagram, three-dimensional constellation points are generated, and the multi-layer three-dimensional constellation diagram comprises a regular polyhedron structure located on the inner layer and a spiral distribution structure located on the outer layer; and generating a complex signal according to the three-dimensional constellation point, the complex signal being used for generating an orthogonal frequency division multiplexing baseband signal. By adopting a mixed structure of an inner-layer regular polyhedron and an outer-layer spiral distribution, the problem of error code performance deterioration under high-order modulation is solved. And due to the spirally distributed energy dispersion characteristic, constellation points are non-uniformly and efficiently utilized in a three-dimensional space, so that the complexity of peak-to-average power ratio suppression is reduced, and the cooperative balance of high-efficiency peak-to-average power ratio suppression and bit error rate optimization is realized.

The described technology is directed towards conveying, from a distributed unit to a radio unit, orthogonal frequency division multiplexing (OFDM) symbol-related data for each symbol of a slot for downlink transmissions by the radio unit. The symbol-related data includes information about each OFDM symbol's power, and the highest order of modulation used per symbol. The conveyed data can indicate a totally blank OFDM symbol. The per-slot symbol-related data can be conveyed in a control plane message to the radio unit, which, in an Open-Radio Access Network (O-RAN) network, can be formatted as a control plane section message type. Based on the slot information, a radio unit can configure the radio unit's power amplifiers, perform crest factor reduction, and / or digital pre-distortion tuning according to dynamic changes in the incoming downlink traffic, which can result in significant reduction in the power amplifiers' power consumption to boost the radio unit's overall energy efficiency.

A data transmission method and apparatus, wherein the method includes: a terminal device receives DCI from a network device, the DCI is used to schedule downlink data and indicate the modulation mode of the downlink data; the modulation mode of the downlink data is a first modulation mode or QPSK, and the modulation order corresponding to the first modulation mode is greater than 2; the terminal device receives the downlink data according to the modulation mode. Through the above process, the network device indicates the modulation mode of the downlink data through DCI, and the terminal device can thus receive the downlink data according to the modulation mode indicated by the DCI, thereby enabling the scheduling of high-order modulation to be indicated through DCI.

Provided are a communication method, apparatus, and system. An apparatus such as a channel interleaver could obtain a first code bit sequence, where the first code bit sequence is obtained after rate matching a second code bit sequence, divide the first code bit sequence into blocks, and channel interleave the blocks according to a pre-defined order, where the channel interleaving is applied to the first code bit sequence before modulation and transmission to a channel. Because the first code bit sequence could be divided into blocks for channel interleaving, the blockwise interleaving with higher parallelism could be implemented, and thus, the flexibility, simplicity, and higher throughput can be achieved while stable or superior performance could be provided under high-order modulation or in a fading channel.

Embodiments of the present specification provide a method and apparatus for compensating for group delay distortion of high-order modulated signals based on subband decomposition, wherein the method for compensating for group delay distortion of high-order modulated signals based on subband decomposition includes: obtaining a received signal and extracting a target pilot code, and calculating a signal-to-noise ratio estimate; determining the number of signal subband decompositions and the length of a compensation filter based on predetermined signal decomposition parameters and a signal-to-noise ratio estimate; decomposing the received signal based on the number of signal subband decompositions to obtain at least four signal subbands; calculating a filter compensation coefficient for each signal subband based on the compensation filter length, and performing group delay compensation on each signal subband based on the compensation coefficient; and generating a target signal based on each compensated signal subband. Embodiments of the present specification perform fine compensation for different frequency components of group delay through subband decomposition, resulting in a flatter channel frequency response within the subband and reduced requirements for estimation error and filter length, thereby avoiding the performance bottleneck of the global equalizer.

The present application discloses a method and system for high-order modulation signal demodulation and equalization processing. A data transmission demodulation unit test system that supports high-order modulation and multi-loop targeted processing based on a distorted constellation diagram and its equalization processing method can effectively address various channel distortion problems and ensure high demodulation performance even under low signal-to-noise ratio conditions through an improved CMA and LMS combined equalization scheme, a multi-loop targeted processing module based on a distorted constellation diagram, and a line amplifier distortion compensation module. This scheme has broad application prospects and is particularly suitable for high-demand digital communication systems, especially in the fields of satellite communication and broadband communication.

The invention discloses a high-order modulation signal demodulation and equalization processing method and system. According to the data transmission demodulation unit test system supporting high-order modulation and multi-circle targeted processing based on the distorted constellation diagram and the equalization processing method thereof, through an improved CMA and LMS combined equalization scheme, a multi-circle targeted processing module based on the distorted constellation diagram and a line amplifier distortion compensation module, various channel distortion problems can be effectively solved, and the performance of the data transmission demodulation unit test system is improved. And high demodulation performance can still be realized under the condition of low signal-to-noise ratio. The scheme has a wide application prospect, and is particularly suitable for digital communication systems with high requirements, especially the fields of satellite communication and broadband communication.

The embodiment of the invention discloses a cross-system link adaptive scheduling method and device, equipment and a storage medium. The method comprises the following steps: firstly, acquiring a queue to be transmitted, determining a clustering number K according to the total load length of data packets in the queue, and then dividing the data packets into K clusters by combining CQIs (Channel Quality Indicator) corresponding to the data packets and a clustering algorithm; and for each cluster, obtaining the minimum CQI corresponding to the data packet, determining the target spectrum efficiency through a preset CQI mapping table, and screening out the highest-order modulation coding mode which does not exceed the target spectrum efficiency as the final modulation coding mode through a modulation coding scheme table. And during sending, sending is performed according to the number of the data packets contained in the clusters from high to low, and the higher the number is, the higher the sending sequence of the clusters is. According to the invention, the CQI difference of the data packets in the physical frame can be greatly reduced, the throughput of the user equipment with high channel quality is remarkably improved, and both the transmission reliability and the spectrum resource utilization rate are considered.

The invention relates to the technical field of unmanned aerial vehicle interference countering, in particular to equipment and a method for unmanned aerial vehicle interference countering, and aims at the 256-QAM high-order modulation and OFDM (Orthogonal Frequency Division Multiplexing) multi-subcarrier characteristics adopted by O4 through multi-mode cooperative interference suppression frequency hopping, spectrum spreading and other anti-interference technologies. The online learning engine autonomously generates a new strategy within 24 hours, reinforces learning of seven-dimensional parameters such as the interception rate of the unmanned aerial vehicle, the convergence communication interruption rate and the out-of-control acceleration, and optimizes an interference strategy in real time. Hot air is guided into the flushing pipe to be mixed with water flow and sprayed out from the high-pressure spray head to complete roller flushing-drying integration, the moving assembly is connected with the base through an annular rotating structure, the roller rotates to be linked with the high-pressure spray head, continuous energy supply is ensured, and the cleaning efficiency is improved.