151 results about "Coded modulation" patented technology

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

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

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

The invention discloses a low-orbit satellite Internet of Things terminal baseband communication system, and relates to the technical field of Internet of Things communication. The system comprises a data frame construction unit, a channel regulation and control unit, a bandwidth tracking unit and a decoding correction unit, wherein the data frame construction unit generates an initial frame according to an Internet of Things protocol and dynamically adjusts a frame structure in combination with channel characteristic parameters to complete data packing; and the channel regulation and control unit judges a coding modulation mode according to real-time channel quality and satellite motion parameters, processes a transmitting link, dynamically adjusts the transmitting power of the high-frequency analog signal based on path loss estimation, and finally transmits the high-frequency analog signal through an antenna. At a receiving end, a bandwidth tracking unit adaptively adjusts the loop bandwidth according to the switching characteristic parameter, and dynamically filters the received signal; and the decoding correction unit performs adaptive early stop correction of iterative decoding according to the decoding convergence rate, and finally completes data analysis.

The invention provides an acoustic-magnetic coupling backflow cable nondestructive testing and long-distance transmission integrated method and system, and relates to the technical field of backflow cable transmission detection, accurate fault identification and positioning are realized by sending acoustic-magnetic dual excitation signals to a backflow cable, collecting responses, extracting multi-source features and then performing fusion model analysis, and the detection accuracy is improved. The problem that a traditional method is low in detection precision is solved. After being coded and modulated, a detection result is stably transmitted to a receiving end through a long-distance transmission link, so that the integration of nondestructive detection and long-distance transmission of the acoustic-magnetic coupling backflow cable is realized, and the defect of instability of long-distance transmission is overcome. And a self-adaptive power amplification and frequency hopping anti-interference mechanism is adopted in the transmission process, so that the anti-interference performance, the stability and the environmental adaptability of signal transmission are improved, and the actual requirements of backflow cable detection and long-distance transmission in a strong electromagnetic interference environment and a complex working condition are met. By introducing a self-adaptive calibration mechanism and comparing with a reference signal, excitation and acquisition parameters are corrected in real time, and the detection precision and the long-term reliability are further improved.

The application discloses an optical transmission method, device and system based on a polar code embedded irregular QC-LDPC concatenated TCM coding and decoding, which comprises the following steps: sending randomly generated information bits into a polar encoder; transmitting the information bits to an irregular QC-LDPC encoder through a reliable channel in the polar encoder; encoding the information bits by the irregular QC-LDPC encoder to obtain a first encoded signal; performing serial-parallel conversion on the first encoded signal to obtain a parallel bit stream; sending the parallel bit stream into a two-dimensional trellis coding and modulation unit to perform coding and modulation, thereby obtaining constellation symbol information; sending the constellation symbol information into a carrier amplitude and phase modulation unit to obtain a modulation signal; and modulating a to-be-sent light source signal by using the modulation signal to complete optical transmission. The application firstly embeds an irregular QC-LDPC code in a polar code, and then concatenates a two-dimensional trellis code, thereby realizing high-speed, stable and reliable transmission of an optical communication system.

The invention relates to the technical field of sound wave positioning, and provides a sound wave positioning multi-label identification and wake-up system and method.The system comprises a transmitting end and a receiving end, and the transmitting end modulates unique identification information of a label to a sound wave carrier through a coding modulation circuit according to a preset frame structure; a coding sound wave signal containing a lead code, a mode code and ID data content is formed, an RFID signal is synchronously transmitted, after a decoding circuit of a receiving end receives the signal, two-stage wake-up detection is carried out by utilizing an integrated frequency detection and mode correlator, interruption is generated only when the mode code is matched to wake up a main control unit, the main control unit reads the decoded ID, and the RFID signal is sent to the receiving end. And matching verification is carried out on the tag and the ID in the RFID signal, and the distance of the tag which is successfully matched is calculated according to the time difference of arrival of the two signals. According to the invention, through the coding sound wave, double-wave pairing and intelligent wakeup mechanism, the problem of signal conflict during multi-label concurrent work is effectively solved.

The invention discloses a wireless data transmission system and method using a compression technology, and the system comprises a data generator which is used for generating to-be-transmitted wireless data and transmitting the to-be-transmitted wireless data to a compression module, the compression module is used for compressing the to-be-transmitted wireless data into compressed data by using a self-adaptive differential pulse code modulation algorithm, and the compressed data is transmitted to the compression module through the self-adaptive differential pulse code modulation algorithm; the gateway end comprises a gateway protocol end and a transmission module, and the gateway protocol end is used for receiving the compressed data packet and sending the compressed data packet to the transmission module for transmission; and the server is used for receiving and decompressing the compressed data packet transmitted by the transmission module so as to realize the transmission of the wireless data to be transmitted. According to the invention, low-cost, high-efficiency and high-real-time wireless data transmission under a large field domain can be realized.

The present invention provides a BDPCM-based image decoding method and an apparatus therefor. According to the present invention, an image decoding method performed by a decoding device is characterized by comprising: a step for determining whether the width and height of a current block are less than or equal to a maximum transform block size; a step for acquiring a BDPCM flag indicating whether block-based incremental pulse code modulation (BDPCM) is applied to the current block when the width and height are less than or equal to the maximum transform block size; a step for acquiring, on the basis of the BDPCM flag, a BDPCM direction flag indicating a prediction direction for the current block; a step for deriving a prediction sample of the current block on the basis of an intra prediction mode derived on the basis of a BDPCM direction flag; and a step for deriving a recovery sample of the current block on the basis of the prediction sample.

The present application relates to the technical field of signal modulation and coding joint identification, and particularly relates to a modulation and coding joint identification method and system based on a multi-channel attention network, which encodes a modulation information sequence by simulating a communication environment with a randomly generated radio information sequence, generates a digital modulation signal and an analog modulation signal, and assembles signal sample data; constructs a multi-channel convolutional gated deep attention network model for modulation and coding joint identification, and trains and optimizes the multi-channel convolutional gated deep attention network model using the signal sample data; inputs a signal to be identified into the trained and optimized multi-channel convolutional gated deep attention network model, and obtains the modulation and coding category of the signal to be identified using the trained and optimized multi-channel convolutional gated deep attention network model. The present application can improve the efficiency of modulation and coding joint identification, can realize the task of signal modulation and coding joint automatic identification, and is convenient for deployment and implementation.

The invention provides a universal satellite flash communication module hardware system and a data transceiving method. The system comprises a master control SoC, a satellite flash baseband, a power module, an interface module, a storage module and a radio frequency front end. The interface module is respectively connected with external equipment and the master control SoC, the master control SoC is connected with the satellite flash base band through a high-speed digital bus, and the system management unit, the task scheduling unit and the protocol stack processing unit are integrated and are responsible for system initialization, state monitoring, computing resource allocation and communication protocol encapsulation and de-encapsulation; the star flash base band is connected with the radio frequency front end to complete encoding, modulation, demodulation and decoding processing of signals; the radio frequency front end receives and transmits wireless signals through an air interface, and conversion between radio frequency signals and baseband signals is achieved. Through an integrated design and a cooperative working mechanism, the data throughput capacity and communication stability are greatly improved, the transmission delay is reduced, meanwhile, high portability is achieved, external connection and use of multiple platforms can be flexibly adapted, and the satellite flash wireless communication function is efficiently expanded.

The invention provides a holographic transmission method and system based on semantic communication and micro-comb, and the method comprises the steps: extracting semantic features from to-be-transmitted original holographic data through employing an integrated code modulation (JCM) network, carrying out the coding of the extracted semantic features, and obtaining a discrete time continuous amplitude (DTCA) semantic sample; generating mutually coherent double micro-combs by using a micro-ring cavity, taking a carrier comb located at a transmitting end in the double micro-combs as a phase cloning carrier, and transmitting a transmitting signal carrying the DTCA semantic sample to a receiving end through an optical fiber; and taking a local oscillator comb located at a receiving end in the double micro combs as a local oscillator, and decoding and reconstructing the received transmitting signal at the receiving end by using a joint decoding demodulation JDD network.

The invention discloses an on-line measuring device and method for a high-energy broadband pulse laser light field and a far-field focal spot. Broadband pulse laser generated by a high-energy laser device is processed by an intensity attenuation system and then reaches a light splitting element; the light beam penetrating through the spectroscope penetrates through a coding plate, the coding plate is used for carrying out coding modulation on the light beam, and then a table array light intensity detector is used for recording the intensity of a single-frame diffraction image formed after modulation of the coding plate; and the spectral data of the light beam reflected by the light splitting element is recorded by a spectral analysis unit. The near-field complex amplitude (intensity and phase) distribution of a to-be-measured high-energy broadband pulse laser light field can be accurately reconstructed through a multi-mode light field reconstruction algorithm by means of single-frame diffraction image intensity recorded on line by an area array light intensity detector and single-time spectrum data recorded on line by a spectrum analysis unit, and meanwhile far-field focal spot distribution can be obtained through inversion. The method has the advantages of simple structure, low cost, strong environment anti-interference capability and the like.

The present application provides a communication method and a related device. The method comprises: determining a first modulation and coding scheme (MCS) on the basis of a first MCS set, wherein the first MCS set comprises at least one second MCS, and the code rate of each second MCS among the at least one second MCS is less than or equal to a first code rate threshold corresponding to each second MCS. In the method, because the code rates of some or all MCSs in the first MCS set are less than or equal to the first code rate threshold corresponding to the MCSs, a lower code rate can be used when the MCS determined on the basis of the first MCS set is used for encoding and / or decoding, so that encoded information comprises more bits than those in information before encoding, thereby improving decoding accuracy in an information transmission process, and thus improving data transmission performance.

The invention discloses a maritime mobile channel adaptive code modulation transmission method and system, and relates to the technical field of wireless communication, and the method comprises the steps: obtaining the dynamic sensing data, spatial position and channel state information historical sequence of a mobile platform; reconstructing an absolute motion velocity vector of the antenna under the reference navigation coordinate system based on the antenna installation position offset characteristic; extracting an effective radial speed scalar in combination with the sight distance direction vector; determining a dynamic channel coherence time boundary, and performing truncation processing on the channel sequence to obtain a target prediction input sequence; generating a reference signal-to-noise ratio predicted value by using the time sequence prediction model; determining a nonlinear back-off compensation amount based on an angular acceleration obtained by rotation angular velocity difference, further correcting a reference predicted value to obtain a target signal-to-noise ratio, and executing physical layer resource mapping; the method can effectively cope with the prediction failure caused by the violent sudden change of the carrier attitude, and improves the robustness and throughput of a maritime communication link.

An image encoding / decoding method and apparatus are provided. An image decoding method according to the present disclosure may include parsing, from a bitstream, first information specifying whether block difference pulse code modulation (BDPCM) applies to an intra-predicted current block, determining a prediction direction of BDPCM for the current block and generating a residual block of the current block based on the determined prediction direction of BDPCM, based on the first information specifying that BDPCM applies to the current block, generating a prediction block of the current block, by performing intra prediction based on an intra prediction mode of the current block, and reconstructing the current block based on the residual block and the prediction block.

An image encoding / decoding method and apparatus are provided. An image decoding method according to the present disclosure may include parsing, from a bitstream, first information specifying whether block difference pulse code modulation (BDPCM) applies to an intra-predicted current block, determining a prediction direction of BDPCM for the current block and generating a residual block of the current block based on the determined prediction direction of BDPCM, based on the first information specifying that BDPCM applies to the current block, generating a prediction block of the current block, by performing intra prediction based on an intra prediction mode of the current block, and reconstructing the current block based on the residual block and the prediction block.

The invention discloses an ultraviolet light communication system based on a transverse effect position sensitive detector, and belongs to the technical field of optoelectronic devices. Comprising a space code modulation module, an imaging lens and a signal demodulation module. The spatial coding modulation module is composed of a 2 * 2 high-frequency flicker ultraviolet LED array, a driving circuit and an imaging lens, four LED units are defined as four spatial coding states respectively, information to be transmitted is converted into an 8-bit binary sequence according to an ASCII coding rule, and the 8-bit binary sequence is split into four groups of 2-bit sub-codes; each group of sub-codes realizes information coding based on a two-dimensional space position by controlling the time sequence lightening of a single LED unit; the signal demodulation module comprises a position sensitive detector and a signal processing circuit thereof. The signal processing circuit is configured to restore a binary sub-code corresponding to an incident light spot through a method of comparing amplitude extreme values of four electrode output signals of the position sensitive detector; and then splicing the demodulated sub-codes into a complete data frame. The method is suitable for short-distance ultraviolet light communication in a complex environment.

A power line communication method and a related device relate to the technical field of communication. The method is applied to a head end node, and comprises the following steps: obtaining a split window plan which comprises the number of split windows and the starting time and duration of a first time window; the windowing plan is obtained based on the windowing number and windowing starting time, the windowing starting time comprises zero crossing point time of an alternating current voltage zero crossing point or first reference time, and the first reference time represents network reference time NTB of the head end node; and sending a windowing plan to the tail end node, wherein the windowing plan is used for the tail end node to obtain the coded modulation parameter corresponding to the first time window. The communication efficiency between the communication nodes can be improved.

The invention discloses a line power failure nuclear phase device which comprises a power frequency alternating current signal generator and a signal receiving device, and the signal receiving device is matched with the power frequency alternating current signal generator to achieve line nuclear phase. The signal receiving device comprises a receiving host, an induced voltage sensor X and an induced voltage sensor Y; the power frequency alternating current signal generator outputs adjustable alternating current voltage and adjustable frequency signals, the phase angle difference of two output power supplies can be adjusted within a preset range, and the phase stepping can select multiple gears; the power frequency alternating current signal generator comprises a battery power supply module, a DC / DC boosting unit, an inverter circuit module, a phase adjusting module, a high-voltage output module and a main control unit which are connected in sequence. The main control unit is electrically connected with the DC / DC boosting unit, the inverter circuit module and the phase adjusting module. The inductive voltage sensor X and the inductive voltage sensor Y are consistent in structure, and each inductive voltage sensor comprises an inductive acquisition terminal, an amplitude limiting protection module, a signal filtering unit, a signal conditioning module, a coding modulation unit and a wireless transmitting module which are connected in sequence.

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

The utility model discloses an audio transmitting device and an audio listening teaching system. The audio transmitting device is applied to the audio listening teaching system and comprises an audio receiving mechanism, an audio conversion mechanism and an audio transmitting mechanism. Wherein the audio emission mechanism comprises a Bluetooth infrared coding modulation module, a Bluetooth infrared radio conversion module and a Bluetooth infrared wireless signal emission module. The audio transmitting device provided by the embodiment of the utility model can simultaneously transmit two wireless audio signals, namely the Bluetooth wireless audio signal and the infrared wireless audio signal, so that a wireless communication mode is added, if the infrared audio signal is interfered, a hearing test can be continued by using the Bluetooth wireless audio signal, and the hearing test efficiency is improved. The hearing examination is not affected, and the use safety and stability of the audio hearing teaching system are improved.

Apparatus is disclosed for generating and modulating the power of a laser beam to be transmitted in an optical communication fiber. The apparatus includes a laser source and an electro-absorption modulator located on a common insulating or semi-insulating substrate. The laser source generates the laser beam. A high- frequency electrical signal encodes data to be transmitted by the modulated laser beam. The modulator is differentially driven by the electrical signal, which is terminated on the common substrate to minimize cross talk with other data channels. Traveling-wave electrodes connecting segments of the modulator and a termination network maintain electrical signal integrity and minimize losses.

The invention provides a broadband atom terahertz detection method and device, and relates to the technical field of terahertz detection and imaging, and the method comprises the steps: generating a time coding sequence through an arbitrary waveform generator, and controlling a microwave switch to carry out the orthogonal coding modulation of a terahertz field, so as to generate a terahertz differential signal carrying coding information; acting the terahertz differential signal on Rydberg atoms in an atomic gas chamber so as to convert terahertz information into transmission light intensity change of probe light, and converting the optical signal into an electric signal; and performing synchronous demodulation and acquisition on the electric signal to generate a measurement vector, and reconstructing an original terahertz time domain waveform from the measurement vector through a compressed sensing reconstruction algorithm. Through combination of superheterodyne detection and a time domain calculation imaging algorithm, the physical limitation of the bandwidth of the atom detector is broken through, and rapid and high-resolution detection of broadband terahertz signals is realized while the advantage of high sensitivity of the atom detector is maintained.

The application provides a video image fast clipping and dimension reduction method and system based on a hierarchical bounding box, applied to the technical field of image processing, wherein the method collects multi-view dynamic scene point cloud data, and then divides the space by using a hierarchical bounding box to establish a bounding box structure with density characteristics; subsequently, optical diffraction array pre-filtering is used, and point clouds are separated based on wavelength selectivity and density distribution to generate a first subset and a background subset; then, adaptive pulse code modulation is used on nodes in the first subset to obtain high-precision data, and nodes in the second subset are compressed into low-code-rate data by using run-length encoding; subsequently, the two types of data are input into an improved k-d tree based on the spatial relationship of the bounding box to generate a two-dimensional point set representing key features, and a spatial index is constructed to realize real-time scene retrieval. The application can realize image dimension reduction while retaining key geometric features of the image, thereby improving efficient real-time spatial retrieval in a dynamic scene.

A method and an apparatus for determining the number of coded modulation symbols, and a communications device are provided. The method includes: obtaining, by a communications device, at least one control factor, where the control factor is used to limit a resource occupied when UCI is multiplexed on a PUSCH; determining first target UCI and second target UCI multiplexed on a target PUSCH for transmission, where a priority of the first target UCI is a first priority, a priority of the second target UCI is a second priority, and the first priority is lower than the second priority; and separately determining, according to a target control factor, the number of coded modulation symbols per layer in a case that the first target UCI and the second target UCI are multiplexed on the target PUSCH.

The present disclosure relates generally to coding modulation techniques for use in digital communication systems such as Orthogonal Frequency Division Multiple Access (OFDMA) systems. More particularly, the present disclosure relates to methods and apparatus for multi-level encoding and decoding. Different receivers coupled to different parallel downlink channels having different channel qualities decode different received signal constellations at different levels of resolution. This allows the overall OFDMA downlink to operate at significantly higher data rates, thereby significantly improving system-level bandwidth efficiency.

The invention relates to an offshore underground high-frequency wireless communication device which comprises a transmitting unit and a receiving unit. The transmitting unit comprises a transmitting master control module, a transmitting circuit and a transmitting coil; the receiving unit comprises a receiving coil, a receiving circuit and a receiving main control module; the emission master control module controls the emission circuit to start and stop according to needs and outputs a coded modulation signal; the transmitting circuit carries out push-pull driving and resonance processing on the coded modulation signal and then loads the coded modulation signal to a transmitting coil to generate an alternating magnetic field; the receiving coil induces a signal of the alternating magnetic field and outputs an induction signal; the receiving circuit amplifies, filters and shapes the induction signal and then outputs a sampling signal; and the receiving master control module demodulates and processes the sampling signal to obtain a wireless receiving signal. The problem that data transmission between two short sections can be achieved only through traditional integrated manufacturing or mutual communication is solved, the problem that the working endurance time of an underground circuit is short under the battery power supply condition can also be solved, and reliable transmission of underground data is guaranteed.

The application provides a communication system based on forward error correction coding modulation, at a sending end, a uniformly distributed source sequence is subjected to Polar code coding, and then bit selection and redundancy insertion are performed on a polar code word through a BCDM algorithm, so that the symbol occurrence probability is adjusted, and shaping gain is obtained.The code word after the Polar code coding is sent to an 8-PAM modulator, so that three continuous bits are mapped into one 8-PAM symbol; and the modulated symbol with a target probability distribution is transmitted through an AWGN channel.At a receiving end, a demodulator demodulates the symbol probability into a bit Log-Likelihood Ratio (LLR); meanwhile, the inverse transformation of the BCDM algorithm is used to delete the redundant information in the bit LLR sequence, and a Polar code decoder corresponding to the Polar code encoder is used for decoding and estimating information bits; and the provision of the system guarantees the shaping gain of the coding modulation scheme, and realizes a low bit error rate.