103 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 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.

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 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.

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.

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 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.

This invention relates to the field of optical signal demodulation, specifically to a parallel optical signal modulation and demodulation method and system based on MicroLED array optical interconnects, comprising: a data acquisition module for acquiring raw data from the external environment or equipment and converting it into a form suitable for subsequent processing; a data processing module for receiving information from the data acquisition module and preprocessing it; and a data analysis module. The overall architecture of high-speed DSP+MicroLED channels breaks away from the traditional approach of "hundreds of channels, DSP-free, wide but slow." By introducing SerDes and DSP modulation and demodulation, the single-channel rate is increased by an order of magnitude, achieving a total bandwidth of ≥120Gbps with ≤32 channels. Simultaneously, single-channel 10–20Gbps OOK / PAM4 modulation is achieved: clearly defining high-order modulation of MicroLED under GHz-level bandwidth conditions, overcoming the carrier lifetime limitations of MicroLED, and ensuring low bit error rate through pre-emphasis, equalization, and FEC.

The application provides a high-speed light-emitting diode underwater wireless optical communication system and method, and belongs to the technical field of underwater optical communication; a transmitting end comprises successively connected adaptive coding module, 16QAM mapping module, OFDM modulation module, digital-analog conversion module and LED array light source module; a receiving end comprises successively connected photoelectric detection module, signal processing module of integrated post-equalization circuit, analog-digital conversion module, digital filter module, OFDM demodulation module, phase estimation module, 16QAM demapping module and Viterbi decoding module; the application provides a high-speed LED underwater wireless optical communication system and method based on 16-order quadrature amplitude modulation-quadrature frequency division multiplexing and hardware equalization, adopts hardware equalization to effectively expand the modulation bandwidth of the LED light source, significantly improves the transmission performance of high-frequency signals, and sufficiently utilizes the frequency spectrum resources through high-order modulation, and significantly improves the data transmission rate of the system.

The invention discloses an anti-interference communication perception integrated waveform optimization method, and belongs to the field of wireless communication. The implementation method comprises the following steps: a transmitter generates a basic pseudo-random noise PRN code and generates a plurality of CSK symbols through cyclic shift, and a CSK modulation signal adopts a multi-system coding mode to enable data bits to correspond to various different code sequences, so that signal modulation is realized, and modulated communication information data is obtained; on the basis of a code shift keying CSK signal and a radar linear frequency modulation signal, a common-inductance integrated waveform is designed, the distance resolution and the detection distance of the radar can be improved on the premise of not increasing peak power, and CSK high-order modulation has higher frequency band utilization rate, high reliability and strong anti-interference capability; besides, the sidelobe level of the fuzzy function of the optimized anti-interference and inductance integrated waveform is lower, so that the dual targets of efficient communication and accurate perception can be realized in an integrated system, and excellent communication and radar performance is achieved.

The application relates to a radio frequency power amplifier linearity improvement method, satisfies the requirement of a high-order modulation communication system on the linearity of a memory type power amplifier, effectively solves the problem of signal distortion caused by the nonlinearity of a radio frequency power amplifier, first, a modeling method is designed to effectively reflect the memory effect of the power amplifier and accurately describe the input-output relationship of the power amplifier, thereby providing support for subsequent predistortion design; then, a predistortion scheme is applied to adjust the input signal on the basis of the accurate model, and the predistortion scheme has the advantages of simple structure, fast calculation speed and relatively easy realization process; in addition, considering the aging and other problems in the actual use process of the device, a real-time updating measure for the predistortion adjustment scheme is designed, the adaptability of the whole system is increased, and the shortcoming that the memory type power amplifier model is only a mathematical model and cannot describe the changes in actual application is made up.

The application provides a noise equalization method and device for a high-order modulation double offset continuous spectrum NFDM system, and belongs to the technical field of optical fiber communication. The method comprises the following steps: generating a distribution probability corresponding to a high-order modulation format constellation point by using an MB distribution at a transmitting end, and generating a PS symbol according to the distribution probability; modulating the PS symbol to a scattering coefficient to generate a time domain signal, and transmitting the time domain signal into an optical fiber after electro-optical conversion; recovering the PS symbol by using a receiving end in a DSP sequence opposite to that of the transmitting end, reorganizing the sequence order of the PS symbol, and obtaining input features of a c-ANN; taking ideal symbols of the transmitting end and the reorganized c-ANN input features of the receiving end as labels and input data of a c-ANN network, obtaining equalized data, and realizing suppression and equalization of ASE noise and processing noise. The application can effectively equalize noise and improve system performance.

The embodiment of the application provides a kind of communication method, system, storage medium, electronic device and computer program product, the method comprises: the original bit data is encoded to obtain N way encoding data, wherein, N is greater than or equal to 2 integer;According to N modulation and coding strategy MCS, N way encoding data is modulated to obtain N way modulation data, wherein, each modulation data corresponds to one MCS;According to the preset physical resource mapping table, N way modulation data is mapped to resource block;Waveform processing is carried out to the data after mapping, to generate time domain signal, and time domain signal is sent through wireless channel.Solution is related to the technical problem that pilotless communication system is difficult to improve performance on high-order modulation and multi-flow in the prior art, and the technical effect of improving data transmission efficiency and transmission quality is realized.

This invention relates to a generalized code division multiplexing (GDM) modulation and demodulation method. GDM modulation is based on the superposition of codewords in a non-orthogonal codeword set through high-order modulation. The demodulation method fully utilizes the characteristics of GDM modulation, employing IFFT-FFT to achieve fast codeword detection, thereby reducing demodulation complexity. Simultaneously, frequency response estimation of the transmission channel can be achieved through a simple spectrum division method in the pilot channel, thereby achieving channel equalization and improving anti-multipath demodulation performance. Furthermore, by constructing an interference cancellation matrix within the data channel, mutual interference caused by the non-orthogonality of codewords within the data channel can be eliminated, thus enabling data demodulation even under non-orthogonal codeword conditions.

The application discloses a dual-mode communication chip and belongs to the technical field of communication. The dual-mode communication chip comprises an HPLC signal sending end and an HPLC signal receiving end; the HPLC signal sending end is configured as an encoding module, is used for encoding load data, and obtains encoded load data; a first storage module is used for storing the encoded load data; a channel interleaving module is used for performing interleaving processing on bit data read from the first storage module; a first bit cache queue is used for sequentially writing bit data from the channel interleaving module in a first bit number and sequentially reading out the bit data in a second bit number according to the writing order; and a bit mapping module is used for mapping bit data from the first bit cache queue to each subcarrier in the second bit number. The application realizes efficient matching of the rate of data processing under a high-order modulation mode and data transmission without subcarrier across physical blocks.

Embodiments of circuits and methods are described below that may provide a modulator that has an enhanced signal-to-quantization-noise ratio (SQNR) for a given sampling frequency and bandwidth or that may enable a reduced sampling frequency for a target SQNR and bandwidth. In one or more embodiments, a modulator circuit may include a first modulator including an input and a first output, and including one or more feed-forward components; an output circuit including an input coupled to the first output and including an output, the output circuit including one of a noise-shaping circuit, a noise-shaped quantizer circuit, or an integrator and feed-forward component; and coefficients of the one or more feed-forward components of the first modulator and a transfer function of the output circuit provide a higher-order modulator with a first-order roll-off at high out-of-band frequencies.

The invention discloses a timing error detection method and device and a storage medium, and relates to the technical field of communication, and the method comprises the steps: obtaining a sampling signal; re-sampling the sampling signal through an interpolation filter to obtain an interpolated signal; inputting the interpolated signal, a pre-calculated theoretical intermediate value and the noise-suppressed signal into a high-order modulation timing synchronous detection error device to obtain a timing error; adjusting the interpolation filter based on the timing error; and outputting a final output signal through the adjusted interpolation filter. According to the invention, the timing error detection accuracy under a low signal-to-noise ratio can be improved.