698results about "Multiple carrier systems" patented technology

The invention relates to the technical field of intelligent communication, and discloses an end-to-end optimization method, a signal constellation geometry and probability joint shaping optimization method in an end-to-end intelligent communication system, and a communication device based on a neural network. According to the method, a transmitter is constructed by using a neural network, and a received signal passes through a two-stage equalization processing system to form an end-to-end optimization framework without assistance of a channel model. The transmitter adopts a modular design, can realize joint optimization of constellation probability shaping (PS) and geometric shaping (GS), and performs joint updating on all trainable parameters of the system based on a total loss function containing an equilibrium error and a decoding error through a back propagation algorithm. According to the invention, computing resources are effectively saved; the two-stage equalization system can accurately compensate channel damage, the realized PS and GS joint optimization can significantly improve the performance of the communication system and reduce the bit error rate, and the method has good performance advantages and practical value in an actual optical fiber communication system.

The invention discloses an encrypted communication system and method based on cognitive multi-carrier spread spectrum, and belongs to the field of covert communication. The encryption communication system comprises a transmitting device and a receiving device. The transmitting device comprises a data encryption module, a constellation encryption modulation module, a multi-carrier spread spectrum module, a frequency hopping module and a cognitive power distribution module. The receiving device comprises a band-pass filtering module, a de-hopping frequency module, a de-spreading module, a constellation decryption demodulation module, a data decryption module and a coherent combination module. The data encryption module is divided into an interleaving coding unit and a double-rule reversible cellular automaton encryption unit. The cognitive power distribution module continuously scans a wireless electromagnetic environment and carries out real-time spectrum analysis to give power spectrum density results sensed under all frequency hopping frequency sets. According to the invention, continuous detection and dynamic response to the spatial frequency spectrum state can be realized, and the communication concealment, the anti-interference performance and the resource utilization efficiency in a complex electromagnetic environment are remarkably improved by utilizing the frequency spectrum hole.

The present invention discloses an unified multiple access (MA) based system for uplink transmission of data by multiple users. The system comprises an user interface integrated transmitter modules for transmitting the data from multiple user transmitters over waveforms through a cooperative unified data grid structure including grid points, said unified data grid structure including each user transmitter allocation of a few non-overlapping grid points for loading respective data bearing symbols, with zeros loaded onto unallocated grid points. The user transmitter is configured to transmit a sparsely loaded grid resembling to the unified two-dimensional data grid structure involving data-bearing Quadrature Amplitude Modulation (QAM), where a part of available grid points of the grid as allocated is loaded with QAM symbols and remaining grid points are loaded with zero symbols. A waveform modulator corresponding to user transmitter is also provided in the present system for waveform modulation of said sparsely loaded grid as per the waveforms enabling transmission for multi-antenna reception of the waveforms to a base station or an access point.

The invention discloses a self-adaptive CPFSK multi-symbol incoherent demodulation method, and belongs to the field of communication signal processing. The implementation method comprises the following steps: initializing a receiving signal and the length of an observation window; performing orthogonal down-conversion on the received signal to obtain a baseband received signal; constructing a local template sequence according to the length of the observation window, and performing baseband modulation to generate a local baseband template signal; according to the baseband receiving signal and a local baseband template signal, constructing an incoherent judgment statistic, and selecting a candidate sequence; classifying the candidate sequences into credible sequences and uncredible sequences by comparing the judgment of the candidate sequences before and after about the same symbol; taking an intermediate symbol of the credible sequence as an incoherent judgment result, and adding one to the position of the symbol to be judged; for an untrusted sequence, the length of an observation window is expanded, a candidate sequence is selected again, an intermediate symbol is used as a new incoherent judgment result, the position of a symbol to be judged is increased by one, iteration is repeated, and self-adaptive multi-symbol incoherent demodulation is achieved.

The invention discloses a radio frequency closed-loop decoupling device and method, and the device comprises a radio frequency sampling module which collects a radio frequency signal of a resonant cavity and converts the radio frequency signal into an intermediate frequency signal; the preprocessing module is used for converting the intermediate frequency signal into an I-path signal and a Q-path signal; the extended state observation module is used for obtaining an I component estimated value, a Q component estimated value and a corresponding generalized disturbance estimator according to the I-path signal and the Q-path signal; the decoupling control module is used for carrying out proportional control according to the I component estimation value and the Q component estimation value, and taking the generalized disturbance estimation quantity as decoupling compensation quantity for superposition to obtain a baseband signal so as to suppress channel coupling and external disturbance; and the radio frequency driving module is used for converting the baseband signal into a driving signal so as to control the amplitude and the phase of the radio frequency output of the power source. According to the invention, dynamic decoupling of the I signal channel and the Q signal channel is realized, and the stability and the control precision of the output amplitude and the phase of the power source are improved.

The invention provides an M-system chaos shift keying communication method, device, equipment and medium, and the method comprises the steps: generating a long chaos sequence and a short chaos sequence through employing two chaos generators with different chaos mapping, mapping an M-system symbol into an embedded position through employing a symbol-to-position mapping table, and carrying out the mapping of the M-system symbol into the embedded position; a short chaotic sequence is embedded into a corresponding position of a long chaotic sequence to generate a combined chaotic transmitting signal, so that M-system transmission can be realized only through two chaotic generators, and M chaotic mapping is not needed to construct a signal space; and a receiving end adopts a deep neural network demodulation model to carry out probability judgment on the segmented subsequences, so that incoherent demodulation is realized, the traditional chaotic synchronization technology and orthogonalization technology are not needed, the system structure is effectively simplified, and the realization difficulty is reduced.

A gateway includes a modulation scheme conversion device which includes a backscattering tag and a tag signal generation unit configured to provide a tag signal to the backscattering tag. The modulation scheme conversion device multiplies a radio signal based on a Bluetooth low energy (BLE) protocol, which has been modulated with a first modulation scheme, and the tag signal to produce a multiplied signal and to reshape the multiplied signal using a second modulation scheme to produce a reshaped signal and backscatters the reshaped signal. The multiplied signal, which is reshaped with the second modulation scheme and backscattered, is provided to a receiver of second modulation scheme signals and then provided to the Internet. The signal modulated with the second modulation scheme is a WiFi signal based on an IEEE 802.11b protocol.

A measurement and control simulation device based on a measurement and control data transmission integrated system comprises an upper computer display control test module, a PC host module, a signal processing master controller module, an isolation DC / DC module, a down-conversion module, a filtering module, an isolator module and an outer end face interface module. The system has the characteristics of multiple modulation systems, a spread spectrum function, controllable output power, Doppler frequency change and the like, can be used for simulating a star chain control system link test in a ground test system, and fully improves the index assessment performance during system docking; meanwhile, the design of a down-conversion link meets the requirements for the strength and sensitivity of the received signal, the stability and accuracy of the radio-frequency signal after frequency conversion in a low-power injection state are remarkably improved, and a new scheme is provided for a high-frequency conversion mode. Besides, the display control module of the equipment has the functions of multiplexing, reconstruction, multi-data interaction and the like, so that multifunctional and multi-task full-system test coverage can be realized, the cost investment of test systems such as spacecrafts and the like is greatly reduced, and the multifunctional index test coverage efficiency is improved.

Disclosed is a method comprising transforming, by a terminal device, a signal constellation based on one or more parameter values, wherein the one or more parameter values indicate a shape of the transformed signal constellation; and transmitting, by the terminal device, one or more signals based at least partly on the transformed signal constellation.

The invention relates to the technical field of wireless communication signal big data analysis, and discloses a LoRa unmanned aerial vehicle communication signal-oriented identification and analysis method, which comprises the steps of obtaining radio signal discrete data in a monitoring area, executing short-time Fourier transform to generate a time-frequency two-dimensional spectrogram, and identifying and intercepting a LoRa signal noisy IQ time sequence by using a convolutional neural network; mapping the sequence into a high-dimensional feature tensor, inputting the high-dimensional feature tensor into a slope statistical attention generative adversarial network, calculating a first-order differential tensor by using a generator, carrying out kernel convolution on the first-order differential tensor and preset linearity statistics to generate an attention mask, and reconstructing a de-noised IQ time sequence by using a bidirectional long-short-term memory network after Hadamard product gating; according to the method, the tensor gating operator based on the physical statistical law is embedded in the neural network, so that the common problem that physical semantic drift is easily generated by a generative model at an extremely low signal-to-noise ratio is solved.

This invention discloses a radar embedded communication method based on OTFS modulation. The implementation steps are: 1. Generating an integrated signal based on OTFS modulation; 2. Estimating the relative speed and distance of the RF tag by the integrated signal receiver; 3. Modeling the time-domain channel based on the speed and distance measurement results of the RF tag by the integrated signal receiver; 4. Equalizing the received signal using the constructed time-domain channel matrix and performing decorrelation decision on the equalized signal. This invention utilizes the characteristic that OTFS signals can obtain full channel diversity in both time and frequency, achieving a more accurate estimate of the time-varying frequency-selective bidispersive wireless channel, and equalizing the fading signal, reducing the communication symbol error rate and effectively improving the communication reliability of the radar embedded communication system.

A wireless communication system for enhanced reliability of wireless communication and reducing peak power in wireless data transmission across different waveforms comprising transmitter modules coupled to waveform modulators including waveform two-dimensional resource or data grids representative of a signal processing domain for transmitting data bit bearing symbols across varied waveforms under controlled sparsely / partially loading of fewer modulated data symbols of the available grid points of a larger two-dimensional resource or data grid for transmission as spaced fewer data symbols with loading zero symbols at remaining empty grid points. The modulated data symbols under controlled sparsely / partially loading including said fewer modulated data symbols being allocated in the resource or data grid and distanced there between based on a factor for partial loading and full number of symbols accommodable in the resource or data grid to reduce cross interference amongst symbols and minimize error rate.

The invention relates to the technical field of wireless communication, in particular to a lightweight multi-device communication protocol intelligent adaptation conversion system for emergency rescue, which comprises a broadband signal segment acquisition step: segmenting a broadband IQ data stream into discrete signal segments based on an energy threshold and an instantaneous bandwidth parameter, extracting physical layer characteristics and packaging to generate a unified protocol data frame; a conversion scheduling control step: analyzing the metadata label to judge a source protocol type, and performing hash matching on the source protocol type and a support protocol list; a heterogeneous protocol streaming translation step: in response to known protocol determination, executing load isolation mapping or ciphertext shell reconstruction based on a protocol parameter mapping table, and generating a target protocol baseband data stream; a dynamic spectrum fingerprint routing step: in response to unknown protocol determination, establishing a transparent bridging channel, and executing digital spectrum shifting and resampling on the original IQ slice; the problems that heterogeneous protocol conversion is high in delay, large in computing power consumption and difficult to give consideration to safety are solved.

Transceiver array synchronization by receiving a clock signal and at least one synchronization pulse signal at each transceiver IC of a plurality of transceiver integrated circuit (IC) subarrays, wherein each transceiver IC subarray contains a respective set of serially connected transceiver ICs; and synchronizing the transceiver IC with other transceiver ICs of the respective set of serially connected transceiver ICs by resetting a delta-sigma modulator (DSM) circuit to a predetermined state in accordance with the received at least one synchronization pulse signal.

Provided is a method (300) and a successive interference cancellation (SIC) based multi-user uplink receiver (200) for multi-user uplink transmission. The method comprises receiving (302) signal of one or more multiple-access (MA) scheme waveforms by a plurality of antennas (202.1, . . . , 202.R) from one or more users. The method further comprises determining (304) one or more effective channel matrices corresponding to the plurality of antennas. Thereby, the method comprises performing (306) channel equalization for signal received in a corresponding antenna by an effective channel matrix. Furthermore, the method comprises combining (308) the channel equalized signal. Subsequently, the method comprises detecting (310) Correctly Decoded Code Blocks (CCBs) and Wrongly Decoded Code Blocks (WCBs). Upon detecting CCBs and WCBs, the method comprises performing (312) the SIC on received signals from one or more users until all WCBs are converted to CCBs or a maximum number of threshold iterations are completed.

The application provides an AM-PM distortion calibration method applied to an UWB transmitter and belongs to the field of UWB communication. The method adds a sampling resistor between a linear voltage stabilizing power supply LDO and a digital power amplifier DPA driving stage of the UWB transmitter using a digital power amplifier, so as to simulate the instantaneous change of the power supply voltage of the DPA driving stage when the UWB pulse is transmitted; an adjustable delay unit is added between a carrier input port LO and the DPA driving stage; the continuous sine wave is transmitted, the phase information under each digital baseband amplitude control word is collected to form original data of the AM-PM distortion of the UWB transmitter, the digital baseband output AM-PM control word is used to control the adjustable delay unit to output the phase which is opposite to the original data and has the same size, so that the phase predistortion of the transmitted UWB pulse is realized, and the AM-PM distortion calibration is completed. The application has the advantages of simple implementation and strong compensation capacity.

This provides a configuration that allows the UE to perform DMRS bundling in PUCCH repetitions in response to an instruction from the base station. The UE receives an instruction from the base station to perform the configuration of bundling DMRS in repetitions of uplink control channel transmissions. The UE determines the DMRS bundling window based on the configuration. The UE transmits the bundled DMRS within the DMRS bundling window. The base station processes the bundled DMRS. Improved link quality and signal gain between the UE and the base station can be achieved by applying DMRS bundling accordingly through multiple repetitions of PUCCH transmissions.

The application discloses a four-dimensional 4nQAM constellation shaping method and system, and belongs to the technical field of constellation shaping. The method comprises the following steps: taking a coordinate origin as a square center, according to a preset constellation point priority, expanding a to-be-shaped constellation point in a concentric square from an inner layer to an outer layer in progression to obtain a two-dimensional geometric shaping constellation; mapping the two two-dimensional geometric shaping constellations to a four-dimensional space in a quadrature manner to generate a four-dimensional geometric shaping constellation; initializing and layering the four-dimensional geometric shaping constellation to obtain independent bit streams of layers of the constellation; inputting the independent bit streams into a distribution matcher of a corresponding layer to perform probability distribution matching, and obtaining a constellation symbol index sequence of the layer; layering and mapping the constellation symbol index sequence according to different Hamming weights, and performing quadrant fusion with the four-dimensional geometric shaping constellation to obtain a four-dimensional probability shaping constellation. The application not only realizes flexible construction of a 4n-order constellation, but also can adaptively adjust a constellation structure according to different application requirements.

The present application provides a communication method and a communication apparatus, applicable to a simultaneous wireless information and power transfer scenario. A constellation diagram for an energy transmission frequency domain resource unit is designed, so that modulation symbols on the energy transmission frequency domain resource unit and a data frequency domain resource unit correspond to different constellation diagrams, that is, the data frequency domain resource unit and the energy transmission frequency domain resource unit are modulated by means of different modulation modes, enabling a receiving end device to correctly identify the position of the energy transmission frequency domain resource unit, thereby demodulating correct data.

A communication device includes a power amplifier that generates power signals according to one or more operating bands of communication data, with the amplitude being driven and generated in output stages of the power amplifier. The final stage can include an output passive network that suppresses suppress an amplitude modulation-to-phase modulation (AM-PM) distortion. During a back-off power mode a bias of a capacitive unit of the output power network component can be adjusted to minimize an overall capacitance variation. A output passive network can further generate a flat-phase response between dual resonances of operation.

The invention discloses an SOQPSK demodulation performance monitoring method and system based on upper computer visual feedback. An SOQPSK signal is demodulated by adopting a maximum likelihood sequence detection method based on a Viterbi algorithm; removing the influence of a phase pulse function through matched filtering processing, extracting I / Q data of a fixed sampling point in each symbol period, carrying out time domain superposition, and generating eye pattern data in real time; based on the mapping relation between the grid state variable of the SOQPSK demodulator and the CPM phase state, the maximum survival state in the Viterbi algorithm is used as a phase value, and constellation diagram data is generated in real time in combination with the survival path measurement increment; and packaging the eye diagram data and the constellation diagram data to an upper computer for display, performing performance parameter evaluation and feeding back to a demodulator. The FPGA generates eye diagram and constellation diagram data in real time and sends the eye diagram and constellation diagram data to the upper computer for display and performance evaluation, and visual performance monitoring is provided. And parameters of the demodulator are adjusted in real time, so that a closed loop is integrally formed.

A method includes: determining a plurality of first subcarrier data items on a plurality of first subcarriers of a first frequency subband; performing first phase rotation on each first subcarrier data item based on a mixing frequency and a first reference frequency corresponding to the first frequency subband; determining a to-be-transmitted signal based on a plurality of first subcarrier data items obtained through first phase rotation; and sending the to-be-transmitted signal. In this way, phase rotation can be performed based on at least the first reference frequency, so that modulation can be correctly implemented without a need to know a mixing frequency of a receiving end. In addition, there is no need to notify the receiving end of the used mixing frequency, and the receiving end can correctly demodulate a received signal even if the receiving end does not know the mixing frequency.

Methods, systems, and devices for wireless communications are described. In some wireless communications systems, a wireless device may support probabilistic shaping for signal modulation. The wireless device may associate a set of data bits with a set of modulation symbols in accordance with a target probability distribution associated with probabilistic shaping of a modulation constellation. For example, the wireless device may map a first portion of the set of data bits to the modulation symbols in accordance with a partial quantization of the target probability distribution. The wireless device may map the remaining data bits from the set of data bits to one or more modulation symbols in accordance with divergence-based quantization, energy-based quantization, or both for the modulation symbols according to a sequential or sort order mapping. The wireless device may transmit a signal with a waveform representing the set of modulation symbols in accordance with the mapping.

A method for a user equipment (UE) includes receiving first information for a first physical downlink control channel (PDCCH) search space set and receiving second information for a second PDCCH search space set. The first PDCCH search space set is a UE-specific, includes first PDCCH candidates associated with a first modulation order, and second PDCCH candidates associated with a second modulation order. The second PDCCH search space set is not UE-specific and includes only third PDCCH candidates associated with the first modulation order. The method further includes determining a first, second, and third PDCCH candidate from the first, second, and third PDCCH candidates, respectively. The method further includes receiving a first and second PDCCH in the first and second PDCCH candidate based on the first and second modulation order, respectively, and receiving a third PDCCH in the third PDCCH candidate based on the first modulation order.

The embodiment of the invention provides a signal transmission method and a communication device, and the method comprises the steps: receiving a data signal and a DMRS, and obtaining a symbol borne by the data signal according to the data signal and the DMRS; according to the method, the power offset proportionality coefficient between the data signal and the DMRS is determined according to the power offset proportionality coefficient, and then the constellation point corresponding to the symbol can be determined according to the power offset proportionality coefficient during demodulation, so that the offset between the coordinate point corresponding to the symbol on the constellation diagram and the constellation point actually corresponding to the symbol in the constellation diagram can be reduced through the power offset proportionality coefficient; therefore, the probability that the symbol is misjudged as other constellation points is reduced, namely the bit error rate in the data signal transmission process is reduced.

A communication method and apparatus are provided, are applied to the field of communication technologies, may be applied to a wireless local area network system supporting 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax like 802.11be, Wi-Fi 7, or EHT, and 802.11bn, Wi-Fi 8, UHR, Wi-Fi AI, or millimeter wave (MMW), and may be further applied to a WPAN system, a sensing system, and the like supporting UWB. A first communication apparatus generates a PPDU, and sends the PPDU. A second communication apparatus receives the PPDU, and parses the PPDU. The PPDU includes first indication information. The first indication information may indicate a first modulation scheme set and a coding rate. The first modulation scheme set is one of N modulation scheme sets obtained through classification based on W modulation schemes. Q modulation schemes in the first modulation scheme set are used to modulate the PPDU.

Example embodiments of the present disclosure are directed to dynamic selection of index modulation pattern subset. A method comprises receiving, from a second apparatus, configuration information indicating at least one pattern subset for index modulation; determining a target pattern subset for index modulation from the at least one pattern subset; and applying at least one portion of the target pattern subset to a communication between the first apparatus and the second apparatus.

The present disclosure relates to communication methods, communication devices, a communication system, a storage medium and a program product, and belongs to the technical field of communications. A method comprises: a first device receives second data corresponding to first data transmitted by a second device, wherein the first data and the second data form training data pairs, and the training data pairs are used for training a first model. In the method provided in the present disclosure, while transmitted data of a transmitting end is unknown, the transmitted data of the transmitting end and received data of a receiving end are combined as training data pairs on the basis of the received data, so as to train a model, thereby improving the model training performance and accuracy.

This disclosure relates to a distribution matching circuit for data transmission. The circuit comprises a first stage distribution matcher (DM) bank and a second stage DM bank, connected via a crossbar interconnect. The first stage DM bank includes a plurality of first stage distribution matchers, which perform an initial stage of distribution matching, generating output bits that are then transmitted to the second stage DM bank via the crossbar interconnect. The second stage DM bank receives these output bits and performs a second stage of distribution matching. The circuit allows for adjustable input lengths in both stages, achieving flexible rates. The second stage DM outputs sequences of different costs. This disclosure is particularly suited for optical communication systems requiring fine-grained rate flexibility and improved performance.

Methods, systems, and devices for wireless communications are described. A wireless communication device may receive a communication signal that includes multiple layers. The signal may include at least one layer that is associated with a probabilistic shaping signal. The wireless communication device may apply one or more probabilistic shaping parameters to the communication signal and obtain a preprocessed signal. The application of the one or more probabilistic shaping parameters may include performing one or more matrix decomposition operations to obtain the preprocessed signal and a preprocessed channel estimate. The preprocessed signal and the preprocessed channel estimate may include probability information associated with the probabilistic shaping signal based on the application of the one or more probabilistic shaping parameters. Accordingly, the wireless communication device may demodulate the communication signal based on the preprocessed signal information.