170 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 discloses a dual-channel millimeter wave transmitter, a receiver and a transceiver system. The transmitter comprises a baseband signal processing circuit, a local oscillator signal processing circuit and a radio frequency front-end circuit comprising a high-frequency channel power amplifier, a low-frequency channel power amplifier and a signal synthesis switching circuit. The radio frequency front-end circuit selectively outputs signals of a high-frequency channel or a low-frequency channel through the signal synthesis switching circuit, and a current adjusting circuit is arranged in the baseband signal processing circuit and used for adjusting mismatch of a switching tube in the mixer. The disclosure also provides a dual-channel millimeter wave receiver and transceiver system based on the same concept. According to the invention, the problem of performance bottleneck of a single-channel transceiver in broadband application is solved, the system linearity is improved, the processing capability of high-order modulation signals is improved, and high power efficiency and high integration level are maintained through optimized circuit design.

The invention relates to the technical field of wireless communication, in particular to a low-orbit satellite broadband Doppler simulation and compensation method based on an OFDM (Orthogonal Frequency Division Multiplexing) system, which comprises a simulation process and a compensation process, and the compensation comprises time domain compensation and frequency domain compensation. According to the broadband Doppler simulation method provided by the invention, the wireless signal more conforming to a real satellite-ground communication scene can be generated, and a ground terminal receiver which performs simulation design based on the analog signal can obtain better performance. The broadband Doppler time domain compensation method provided by the invention is suitable for high-throughput, large-bandwidth and high-order modulation scenes, and can accurately compensate the interference of Doppler frequency shift and improve the demodulation performance. The broadband Doppler frequency domain compensation method provided by the invention is suitable for low-delay, small-bandwidth and low-order modulation scenes, an original ground cellular network terminal receiving scheme does not need to be modified basically, and better demodulation performance can be obtained under the condition of low development cost.

Methods, systems, and devices for wireless communications are described. In some examples, a transmitting device, such as a user equipment (UE) or a network entity, may encode an information bit vector into multiple code blocks using a polar code partitioned into multiple sub-blocks having a same block length in accordance with a polar transformation associated with a modulation scheme. In some examples, each code block of the multiple code blocks may be encoded using a respective sub-block of the multiple sub-blocks. Additionally, the transmitting device may interleave respective bits of each code block of the multiple code blocks using a respective interleaver of multiple interleavers. As such, the transmitting device may transmit the respective interleaved bits of each code block of the multiple code blocks over a respective bit channel of multiple bit channels, where each bit channel of the multiple bit channels is associated with a respective reliability.

The invention provides an intelligent spectrum allocation method and system for a self-adaptive signal-to-noise ratio of a C + L optical network, and relates to the technical field of optical fiber communication, and the method comprises the steps: initializing a C + L wave band elastic optical network, and determining nodes, links, spectrum slots and time slot resources; receiving a service request, and defining a source node, a destination node, time slot requirements and capacities; calculating a link weight according to a transmission distance and spectrum occupation, and selecting an optimal path; determining a modulation format according to the path distance, and calculating a required spectrum gap; high-order modulation is allocated to a C wave band, and low-order modulation is allocated to an L wave band; ensuring that spectrum slots are continuous and links are consistent, otherwise, the request fails; and selecting the spectrum block distribution with the highest OSNR, comparing the OSNR with a threshold value, and determining whether the request is successful or not. According to the invention, the transmission quality of the service request is improved, and resource allocation can be carried out more comprehensively and accurately.

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 invention provides a band-gap reference circuit, and relates to the technical field of integrated circuits, and the band-gap reference circuit comprises a core circuit, a negative temperature current extraction circuit, a high-order modulation processing circuit and an output circuit. The core circuit is used for generating an X-point voltage, a positive temperature coefficient PTAT current without a base current and a negative temperature coefficient CTAT current mixed with the base current. Wherein the X-point voltage is the base-emitter voltage of a triode through which the PTAT current flows in the core circuit. And the negative temperature current extraction circuit is used for extracting CTAT current without base current according to the X-point voltage. And the high-order modulation processing circuit is used for generating band-gap reference current which is subjected to high-order modulation and is subjected to base current influence elimination according to the X-point voltage and the PTAT current provided by the core circuit and the CTAT current provided by the negative temperature current extraction circuit. And the output circuit is used for converting the band-gap reference current into band-gap reference voltage and outputting the band-gap reference voltage.

The invention discloses a high-order modulation iteration frequency offset phase correction method and device, and the method comprises the steps: carrying out the initial estimation of frequency offset and phase offset at a known position based on the known sequence or pilot frequency information, calculating the initial estimation of signal frequency offset and phase offset at a high-order modulation symbol position, and carrying out the compensation of the frequency offset and phase offset; demodulating the signal after initial correction, and extracting constellation point estimation of the high-order modulation signal; calculating estimated update values of frequency offset and phase offset through the high-order modulation signal estimated value; and correcting the received signal by using the estimated phase offset and frequency offset, and carrying out loop iteration in sequence until the preset precision or iteration times is reached. According to the iterative joint correction method and device, the frequency offset and the phase error can be gradually reduced, and the demodulation accuracy of the high-order modulation signal is improved.

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.

The invention discloses a hollow-core optical fiber Kerr effect nonlinear coefficient characterization method, device and equipment and a storage medium, and relates to the technical field of optical communication, and the method comprises the steps: receiving a high-order modulation signal transmitted by a to-be-tested hollow-core optical fiber in a transmitting end, and carrying out the demodulation of the high-order modulation signal, and obtaining a high-order demodulation signal; mapping the high-order demodulation signal into a constellation diagram, and determining the nonlinear phase shift of the high-order demodulation signal in the constellation diagram; based on the nonlinear phase shift of the high-order demodulation signal in the constellation diagram and a pre-constructed Kerr effect nonlinear mathematical model, determining a Kerr effect nonlinear refractive index coefficient of the to-be-tested hollow-core optical fiber; and based on the Kerr effect nonlinear refractive index coefficient of the to-be-tested hollow-core optical fiber, optimizing the communication performance of the to-be-tested hollow-core optical fiber. Through the mode, the mapping points in the demodulated signal constellation diagram are analyzed to determine the nonlinear phase shift, so that the nonlinear refractive index coefficient of the Kerr effect is accurately calculated by utilizing the nonlinear mathematical model and the nonlinear phase shift.

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 present invention discloses a high spectral efficiency and low power consumption joint channel coding modulation optical communication method and system, and relates to the field of high-speed optical fiber communication technology. It includes a data acquisition step, a symbol multiplexing joint channel coding modulation step, a signal light transmission step, a channel equalization step, and a symbol demultiplexing step. The present invention aims to improve the problems of relative independence of forward error correction channel coding FEC and high-order modulation function modules in optical transmission, dependence on FEC long code length, limited spectrum efficiency improvement under the limitation of optical fiber nonlinear effects, and high FEC decoding delay and power consumption, which is beneficial to improving the spectrum efficiency and capacity of coherent optical transmission systems and optimizing system delay and power consumption.

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 discloses a high-speed demodulation method, device and equipment suitable for low-orbit satellites. The demodulation method includes down-converting an intermediate frequency signal to a baseband signal, then decimating and down-sampling the baseband signal and low-pass filtering it, searching for the frame header through an FFT-based capture method, determining the pilot position, and then performing power estimation and channel gain control, followed by fast timing synchronization and carrier synchronization, and finally performing LDPC decoding on the synchronized data. The present invention adopts high-speed parallel processing technology and high-order modulation and demodulation technology, and the information processing capacity can reach more than 1Gbps; it also adopts high-dynamic capture and synchronization technology, which can adapt to the high-speed movement characteristics of low-orbit satellites. The center frequency and channel gain of the present invention are flexibly configurable, and can support a variety of rates and modulation methods, and are particularly suitable for high-speed signal communications in low-orbit satellite communication systems.

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 cloud edge collaborative encryption transmission method and system suitable for a new energy station, and the method comprises the steps: inputting continuous wave laser into a first processing unit for phase modulation, generating a phase chaotic carrier, amplifying the intensity of a light field, and inputting a light signal into a phase modulator, thereby achieving chaotic encryption; amplitude-phase chaos is multiplexed through a polarization multiplexing technology, and phase decryption is realized through a reverse differential feedback loop after demultiplexing of a receiving end; a polarization controller is used for converting a chaotic signal into a polarization state, and phase deviation is introduced through an optical fiber delay line, so that demodulation of an optical signal is realized. The amplitude-phase two-dimensional chaos model based on electro-optic phase feedback chaos is provided, time-delay-hidden, ultra-wideband and high-complexity chaos signal generation is achieved in combination with wavelength division multiplexing, transmission between data of multiple photovoltaic stations and a cloud platform can be encrypted at the same time, and the method is transparent in signal modulation format and easy to implement. And high-speed signal encryption and decryption in a high-order modulation format can be supported.