1584results about "Transmitter/receiver shaping networks" patented technology

The invention provides an Internet of Vehicles broadcast frame radio frequency fingerprint identification method based on LMMSE channel estimation. The method comprises the following steps: obtaining subcarrier data in a resource grid based on an obtained signal of a physical side link broadcast channel; performing root-mean-square delay expansion and channel autocorrelation matrix construction based on the subcarrier data, and combining priori signal-to-noise ratio regularization and time domain windowing operation to obtain a channel estimation value; initial radio frequency fingerprint features are obtained through the channel equalization and the channel estimation value, and the improved neural network and the initial radio frequency fingerprint features are utilized to carry out classification identification on the Internet of Vehicles equipment. Influences of noise and channels on fingerprints are effectively considered, and the purpose of extracting fingerprints of different devices in a complex environment more accurately is achieved.

Aspects of the subject disclosure may include, for example, receiving, via an antenna, a communication signal generated by a communication device, and detecting interference in the communication signal, wherein the interference is generated by one or more interference sources, wherein the interference is detected by monitoring a near field region of the antenna, an intermediate field region of the antenna, a far field region of the antenna, or any combinations thereof, wherein the monitoring excludes monitoring only the far field region of the antenna. Other embodiments are disclosed.

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 relates to the technical field of high-frequency multichannel synchronous transmission, in particular to a time domain reflection compensation design method for high-frequency signal transmission loss, which comprises the following steps of: 1, responding to a synchronous trigger signal to generate an active reflection reference signal with a determined time domain position; 2, aligning time marks between channels through cross-correlation operation; 3, extracting a reflection feature template of the channel from the alignment signal, and recognizing and eliminating crosstalk components through convolution operation with an adjacent channel template; 4, constructing a time-varying transfer function model according to the amplitude envelope attenuation characteristic and the carrier phase jump characteristic of the reflection characteristic template; and 5, generating a compensation filter based on the time-varying transfer function model, and verifying the compensation effect through secondary reflection. Through cross-correlation operation, accurate alignment of multi-channel signal time scales is realized, the time delay difference between different transmission channels is overcome, signal synchronization of each channel is ensured, and the beam forming precision is improved.

The invention relates to the technical field of wireless communication, and discloses a compensation method for electronic radio frequency communication. According to the compensation method for the electronic radio frequency communication, the radio frequency signal and the channel state information are acquired, the original data set is generated, and the preprocessing steps of denoising, signal amplitude correction, phase correction and the like are performed, so that the data quality is improved, accurate parameter evaluation is performed by adopting the minimum mean square error, the accuracy of channel characteristic parameters is ensured, and the communication quality is improved. A mathematical model constructed based on the parameters enables calculation of compensation parameter gain and phase deviation to be more accurate, so that attenuation and distortion caused by signal propagation in a channel are effectively compensated, and finally, quality evaluation is carried out on the bit error rate and the signal-to-noise ratio of the compensated signal, so that the compensation effectiveness is ensured, and the signal quality is improved. And if the compensation is invalid, the calculation can be returned in real time for recalculation, so that the quality of the whole signal is improved.

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.

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.

The invention relates to the technical field of digital demodulation, in particular to a digital demodulation method suitable for deep ultraviolet light communication, which comprises the following steps of: adopting multiple delay processing with half code element width, and respectively carrying out double extraction processing on a discrete sampling signal which is not subjected to delay processing and a plurality of delay sampling signals to obtain a plurality of delay extraction signals; in this way, the key sampling time in the coverage code element period can be ensured, and a basis is provided for subsequent accurate synchronization; a plurality of delay extraction signals are respectively input into corresponding equalization processing units, a preset local training sequence is loaded to each equalization processing unit to obtain a plurality of equalization filtering signals, and the plurality of equalization filtering signals and the preset local training sequence are respectively subjected to related judgment processing, so that the inter-symbol interference is inhibited, and meanwhile, the equalization processing efficiency is improved. The synchronization signal can be quickly screened out, so that the problem that inter-symbol interference and synchronization are difficult to consider in a traditional demodulation method is solved, and the demodulation efficiency and reliability are remarkably improved.

Circuits for reflection cancellation in single-ended signaling are disclosed. A transmission circuit includes a control circuit configured to receive a plurality of input signals that include a plurality of symbols having at least one bit and a data driver circuit configured to generate a particular signal on a transmission medium using a particular symbol of the plurality of symbols. The transmission circuit further includes a reflection cancellation circuit configured to, after a generation of the particular signal, generate a reflection cancellation signal on the transmission medium using an inverted value of a different symbol of the plurality of symbols received prior to the particular symbol. A first composite of the particular signal and the cancellation signal is readable at a load as a value of the particular symbol, wherein the load is configured to receive a transmitted signal via the transmission medium.

For example, a millimeterWave (mmWave) wireless communication station (STA) may be configured to transmit a preamble of a packet via a plurality of antennas of the mmWave STA over a mmWave wireless communication channel; and to transmit a Multiple-Input-Multiple-Output (MIMO) Training (TRN) field of the packet over the mmWave wireless communication channel, the MIMO TRN field is after the preamble, the MIMO TRN field including a sequence of a plurality of MIMO TRN subfields transmitted via the plurality of antennas of the mmWave STA. For example, a MIMO TRN subfield of the plurality of MIMO TRN subfields may include a plurality of TRN sequences simultaneously transmitted via the plurality of antennas, respectively.

A receiver device receives a signal transmitted to the receiver device over an optical communication channel and equalizes the signal using a multi-decision feedback equalizer of the receiver device. Equalizing the signal includes generating, using at least one decision feedback equalizer configured with a plurality of slicing thresholds, decisions on symbols transmitted to the receiver device, detecting that a decision made by the decision feedback equalizer is unreliable. Equalizing the signal also includes, in response to detecting that the decision is unreliable, tracking, for a tracking period, multiple decision paths that generate respective possible sequences of symbols transmitted to the receiver device, determining error energies in decisions made, during the tracking period, in respective decision paths, and selecting, based on a comparison between the respective error energies, a sequence of symbols generated in one of the multiple decision paths as an output of the multi-decision feedback equalizer.

The invention discloses a method and a device for determining working parameters of an adaptive equalizer. The method comprises the following steps: selecting a first initial value and a first offset of an adaptive equalizer in a chip according to a current link rate and cable information; determining a first working parameter of the adaptive equalizer according to the first initial value and the first offset; receiving signal feedback information of a receiving end corresponding to the chip is acquired; when determining that the signal transmission quality is lower than a preset value according to the received signal feedback information, reselecting a second initial value and a second offset of the adaptive equalizer, and obtaining a second working parameter of the adaptive equalizer according to the second initial value and the second offset, and the signal transmission quality is not lower than the preset value when the adaptive equalizer operates according to the second working parameter. According to the method and the device, the technical problem that in the prior art, due to the fact that self-adaptive balanced insertion loss changes exist in a chip under different cable lengths and cable types, frequent manual parameter adjustment is needed, and the operation is relatively tedious is solved.

Serializer / deserializer (SerDes) modules, equalizers, and equalization techniques having robust parameter initialization may substantially reduce convergence time. One illustrative equalizer includes: a discrete-time, finite impulse response (“FIR”) filter to convert a receive signal to a filtered signal; a decision element to determine channel symbols represented by the filtered signal; and a controller. The controller is configured to, for each of multiple values in a search range, estimate a performance of the equalizer based on the channel symbols and at least one of the filtered signal or an input signal to the decision element; configured to find a centroid value based on the performance for each of the multiple parameter values in the search range; and configured to derive an initial value for the parameter from the centroid value.

The invention belongs to the technical field of electronic search, and relates to a radio reconnaissance method and system based on multichannel parallel processing and intelligent clustering, and the method comprises the steps: carrying out the multi-phase filtering digital channelization processing of a broadband radio signal, so as to obtain adjacent channel sequences with overlapped frequency bands; performing square law detection and constant false alarm detection on each channel sequence to generate an initial pulse description word; establishing a candidate corresponding relationship in adjacent channels based on arrival time similarity and noise consistency, and determining a cross-channel merging relationship according to frequency range continuity and frequency-time relationship slope consistency to generate a complete pulse description word; performing hierarchical clustering sorting based on the arrival angle and the pulse width; and performing multi-stage differential analysis on a clustering result to extract a repetition frequency sequence and determine a repetition frequency type. According to the technical scheme, the stability and consistency of cross-channel pulse merging and sorting results can be kept under the broadband high-density condition, and the radio search processing precision under the complex electromagnetic environment is improved.

The invention relates to a high-precision photonic crystal waveguide signal detection method and device based on a diamond quantum sensor. The method comprises the following steps: acquiring a vibration signal transmitted by a phononic crystal waveguide through a diamond quantum sensor; performing frequency domain transformation on single-frame signals in the vibration signals in sequence to obtain single-frame frequency domain features; inputting the frequency components into a trained detector model, acquiring a long-range dependency relationship between frequency characteristics corresponding to different frequency components and context information between the frequency characteristics through a self-attention module, and correcting the frequency characteristics corresponding to the related frequency components according to the long-range dependency relationship and the context information; identifying an aggregation feature containing the corrected frequency feature through a classification layer to obtain a predicted binary numerical value corresponding to the single-frame frequency domain feature; the long-range dependency relationship means that the amplitude information and / or the phase information between the two frequency components with the frequencies exceeding the preset threshold value have an association relationship. The method can improve the signal detection precision.

A voltage mode driver circuit has a first driver slice has a pullup structure that includes a first transistor and a second transistor and a pulldown structure that includes a third transistor and a fourth transistor. The first transistor has a gate that receives a first version of a first data signal. The second transistor has a gate that receives a first version of a second data signal. The third transistor has a gate that receives a second, complementary version of the first data signal. The fourth transistor has a gate that receives a second, complementary version of the second data signal. The first data signal encodes data in a first mode and enables the pullup and pulldown structures in a second mode of operation. The second data signal encodes data in the second mode of operation and enables the pullup and pulldown structures in the first mode of operation.

This application provides an uplink control information transmission method and a device, and relates to the field of communications technologies, to reduce an ACK / NACK feedback latency. The method includes: receiving, by a terminal, PDCCHs, where the PDCCH are used to schedule PDSCHs, and the PDCCHs include a first PDCCH set and a second PDCCH set; then, generating, by the terminal, a first codebook and a second codebook, where the first codebook corresponds to the first PDCCH set, the second codebook corresponds to the second PDCCH set, and the first PDCCH set and the second PDCCH set correspond to different values of codebook identification information of the PDCCHs; and finally, sending, by the terminal, the first codebook and / or the second codebook. This application is applicable to a process of feeding back an ACK / NACK.

A method performed by an electronic device is provided. The method includes obtaining a signal on a plurality of resource elements (REs), selecting, based on a time interval between symbols, reference REs from the plurality of REs, and a frequency interval between the symbols, performing, based on the reference REs, channel estimation, obtaining, based on a result of the channel estimation, a plurality of first weights corresponding to the reference REs, obtaining, based on the plurality of first weights, a plurality of second weights corresponding to other REs distinct from the reference REs from among the plurality of REs, and obtaining, based on the plurality of first weights and the plurality of second weights, information corresponding to the signal.

The invention discloses a cross-medium wearable audio transmission system and a transmission method thereof, which are suitable for audio communication scenes in an air and water body junction environment such as a natatorium. The system comprises a shore transmitting terminal and an underwater receiving earphone, and adopts a blue-green light wave band as a transmission carrier to realize cross-medium wireless transmission of audio signals. The transmitting terminal comprises an audio preprocessing module, a modulation and driving module and a coarse-fine composite light beam alignment module; the receiving earphone comprises an optical receiving module, a posture sensing and aligning module, a signal processing module and a bone conduction audio output unit. According to the system, through a dynamic attitude compensation and light beam alignment mechanism, the audio transmission rate greater than or equal to 1Mbps in a 10-meter range is realized, the error rate is less than or equal to 1 * 10 <-6 >, and the transmission delay is less than 50ms. The method has the advantages of high communication quality, strong anti-interference capability, good wearable performance and the like, and is suitable for scenes of underwater training, voice guidance, immersive audio playing and the like.

Methods and systems for NN-based digital pre-distortion for digital envelope tracking power amplifiers. A computer-implemented method includes receiving a measure of a digital envelope at a digital pre-distortion module having a neural network (NN)-based digital pre-distortion structure for digital envelope tracking (DET), receiving a transmit signal at the digital pre-distortion module, inputting the measure of the digital envelope and the transmit signal into the NN-based digital pre-distortion structure to produce a pre-distorted transmit signal, adjusting nonlinearity compensation of a power amplifier based on the measure of the digital envelope, and using the adjusted nonlinearity compensation of the power amplifier to produce an output signal.

The invention discloses an anti-interference underwater acoustic channel estimation method and device based on model data dual drive, and the method comprises the steps: obtaining an interference data set, and training a neural network; preprocessing the underwater acoustic signal to obtain a pilot frequency part signal, and initializing a channel, an interference sample, a sampling moment and a channel precedence variance gamma; respectively obtaining interference and channel prior scores at the t'moment by using a neural network and an analytical model; the logarithmic likelihood function obtains a gradient about interference and channel conjugation to obtain interference and channel condition scores, and the prior and condition scores are weighted and summed to obtain interference and channel posterior scores; the channel samples and the interference samples are corrected through annealing sampling, gamma is updated, and the posterior score is calculated again; a channel sample and an interference sample at the t'moment are obtained through the inverse process of the diffusion model; and if t'reaches tmin, outputting a final estimated value, otherwise, updating gamma according to the channel sample at the t 'moment, and circulating. According to the invention, accurate estimation of the single carrier communication channel in the structured interference environment is realized.

Data transceivers including a transmitter configured with a digital filter, and a receiver configured with an equalizer, are equipped with logic to measure a combined pulse response to a symbol generated by the transmitter at an output of the equalizer, adjust the combined pulse response by an impulse response of the digital filter to generate an adjusted pulse response, and modify the digital filter with one or more floating taps based on the adjusted pulse response.

A method of wireless communication includes determining a first precoding matrix indicator (PMI) value and a second PMI value, the first PMI value indicating a first matrix W1 of a first codebook C1, the second PMI value indicating a second matrix W2 of a second codebook C2, wherein the first matrix W1 and the second matrix W2 together define a precoding matrix W for multi-antenna transmission. The method also includes transmitting the first PMI value at a first periodicity, and transmitting the second PMI value at a second periodicity shorter than the first periodicity. In some examples, the method also includes transmitting a rank indicator (RI) value, where the first PMI value and the second PMI value are determined based on the RI value.

The invention relates to a radio frequency fingerprint identification method based on knowledge and data hybrid driving, which comprises the following steps of: on one hand, learning channel characteristics of an input signal by using a SupportNet model, and carrying out equalization processing on the signal so as to remove the influence of Doppler frequency offset on the signal and obtain a signal irrelevant to a channel; on the other hand, radio frequency fingerprint features are extracted in parallel through the knowledge graph and the one-dimensional convolutional network, the radio frequency fingerprint features extracted in parallel through the knowledge graph and the one-dimensional convolutional network are spliced, feature recombination is achieved through the attention module, enhancement of effective features and weakening of irrelevant features are achieved, and finally classification is conducted through the classifier. Therefore, the radio frequency fingerprint identification performance in a high-speed moving scene is improved. According to the method, the signal is subjected to equalization processing by using a SupportNet model, radio frequency fingerprint identification is realized by combining a convolutional neural network and a knowledge graph, and the method is suitable for a high-speed mobile channel.

Implementations of a pre-emphasis signal processing system may include an output driver which may include a pre-emphasis transistor coupled with a steady state transistor, where gates of the pre-emphasis transistor and steady state transistor may be coupled together. The system may include a regulator voltage input coupled to a source of the pre-emphasis transistor; a first resistor coupled between a drain of the pre-emphasis transistor and an output of the output driver; and a second resistor coupled between the drain of the steady state transistor and the output of the output driver; and a pre-emphasis source including a current source coupled to a delay transistor, the delay transistor coupled with the output of the output driver.

The invention discloses a pilot frequency guard band dynamic adjustment method and system, electronic equipment and a storage medium, and relates to the technical field of communication. The method comprises the following steps: performing high-precision channel measurement based on a time delay-Doppler domain pilot frequency structure, and constructing a time-varying parameter matrix; establishing a time delay-Doppler domain resource grid mapping relation based on the time-varying parameters, and determining a pilot frequency guard band; and adaptive optimization is carried out on the pilot frequency guard band, and the range of the pilot frequency guard band is dynamically adjusted. According to the method, a double-layer self-adaptive mechanism is utilized, the multi-scale nonlinear adaptation problem of the pilot frequency protection band in a high dynamic scene is solved, the pilot frequency protection band configuration is dynamically adjusted, the pilot frequency pollution problem caused by the time delay and Doppler asymmetric change in the satellite top passing period is solved, intelligent optimization of the pilot frequency protection band configuration is achieved, and the pilot frequency protection band configuration is optimized. And meanwhile, the guard band range can be optimized in real time according to the channel quality, the anti-interference capability is enhanced when the channel is degraded, resources are quickly released when the channel is recovered, and the balance between the robustness of the system and the spectrum efficiency is considered.

The invention provides a low-power-consumption feed-forward equalizer circuit which comprises a grouping processing module which divides tap values of tap coefficients of the feed-forward equalizer circuit into a plurality of groups, each group comprises a plurality of tap values, and a tap combination value needing to be processed by each lookup table module is calculated; the lookup table module is used for storing the tap combination value which is calculated in advance and performing lookup operation according to the bit combination of the input data to generate an intermediate result; the clock gating trigger module is used for enabling a signal tapdata to be equal to 1 when a tap value is updated, completing updating of the tap value output by a register DFF, and closing an input clock of the DFF when the tap value is kept unchanged and the tapdata is equal to 0; the shift accumulation module performs weight shift operation on the intermediate results output by the lookup table module and then accumulates the intermediate results to generate a plurality of groups of tap value processing results; and the result output module outputs a final equalization signal of the feed-forward equalizer circuit. The FFE circuit is realized by converting the multiplier into the LUT table and the adder, and the power consumption of the FFE circuit is greatly reduced while the signal processing performance of the FFE circuit is ensured.

The application discloses a wireless signal transmission method, comprising the following steps: transmitting an incident signal within a set resource time length; a first transmission time delay exists in the process of the incident signal reaching a receiving end; a reverse signal is a scattered signal in response to the incident signal, and a second transmission time delay exists in the process of the reverse signal reaching a target end; the time length of the incident signal and / or the reverse signal is set so that the reverse signal reaching the target end is within the set resource time length. The application also comprises a device applying the method. The application solves the timing problem of a reverse scattering communication device transmitting a signal in a mobile communication network, so as to meet the index requirements of the system in terms of inter-code interference and inter-channel interference, and is especially suitable for a system of reverse scattering communication.

Systems and methods are described for generating and implementing pulse-shaping filters for efficient utilization of limited spectral resources in wireless communication systems. Wireless communication systems operating at high spectral efficiency conventionally use pulse shaping filters that rely on Nyquist waveforms for good main lobe performance with low inter-symbol interference (ISI) power. Conventional uses of non-Nyquist waveforms typically involve an orthogonalization process to convert those non-Nyquist waveforms to Nyquist waveforms for ISI free performance. Embodiments of pulse shaping filters described herein generate a non-Nyquist partial response (NNPR) transmit filter and / or matched receive filter based on applying a tunable second-weighted orthogonalization to a tunable first-weighted non-Nyquist waveform to obtain a pulse-shaping waveform with parametric control over throughput and power penalty.

Systems and methods are provided for detecting bit errors and further processing bit error information. A method, according to one implementation, includes the step of receiving a binary test sequence pattern generated by a pattern generator at an input to a digital communications system under test, wherein the binary test sequence pattern includes a plurality of sub-patterns. The method also includes the step of receiving an output binary sequence from an output of the digital communications system. Also, the method includes comparing the binary test sequence pattern with the output binary sequence to detect bit errors. Based on correlation characteristics between the bit errors and each of the sub-patterns, the method also includes the step of determining whether the bit errors are caused by random factors or are caused by deterministic factors associated with the digital communications system.