234 results about "Non coherent" patented technology

The invention provides a coherent signal arrival direction estimation method and device based on a deep convolutional network, and belongs to the field of array signal processing. The method comprises the following steps: receiving a to-be-detected signal containing a coherent signal by using a uniform linear array antenna to obtain an array receiving data matrix and extract a covariance matrix; forming an input feature vector by right upper triangular elements divided from a diagonal line in the covariance matrix, inputting the input feature vector into a covariance estimation model formed by a deep convolutional network, obtaining an estimation value of the right upper triangular elements under an ideal incoherent condition, and reconstructing the estimation value to obtain a covariance matrix estimation value; and performing characteristic decomposition on the covariance matrix estimation value, and generating a spatial spectrum by using a MUSIC algorithm to obtain an estimation result of the signal arrival direction. According to the method, the noise-containing mixed signal covariance matrix is mapped into the ideal incoherent noise-free signal covariance matrix through a physical constraint supervised learning framework, so that the estimation precision and robustness of the MUSIC algorithm in a coherent scene are improved.

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.

Apparatuses, systems, and methods for providing downlink control for non-coherent joint transmission. A cellular base station may provide downlink control information associated with a non-coherent joint transmission downlink data communication to a wireless device, which may receive the downlink control information. The downlink control information may be provided as a single downlink control information including scheduling information for two data streams of the non-coherent joint transmission data communication, or a portion of a multi-stage downlink control information transmission. The wireless device may receive the non-coherent joint transmission downlink data communication based at least in part on the downlink control information.

Methods, systems, and devices for wireless communications are described. In some examples, a transmitting device associated with one or more non-coherent demodulation reference signal ports may transmit data including a phase change estimation reference signal with multiple reference signal groups. In some examples, multiple different phase change estimation reference signal ports may be code-division multiplexed to transmit the phase change estimation reference signal in the same set of reference signal groups using a different orthogonal cover code for each phase change estimation reference signal port. In some other examples, the different phase change estimation reference signal ports may be used for transmitting the phase change estimation reference signal in the different time-division multiplexed sets of reference signal groups. In such cases, by assigning two phase change estimation reference signal ports to two TDM sets, the two phase change estimation reference signal ports may be time-division multiplexed.

The invention discloses a fan structure deformation monitoring method based on distributed millimeter-wave radars, and relates to the technical field of detection, and the method comprises the steps: arranging at least two millimeter-wave radar nodes at the bottom of a fan tower in a non-intrusive manner, and controlling the emission time sequence of each radar through a unified PWM trigger signal and a preset time delay matrix, co-frequency interference is eliminated, and multi-radar cooperative detection is ensured; performing distance-Doppler FFT processing on echo signals acquired by each radar node, generating local point cloud data in combination with incoherent accumulation and a constant false alarm detection algorithm, and converting polar coordinates into rectangular coordinates to form a three-dimensional point cloud model; performing iterative registration on the local point clouds of the multiple radar nodes based on an ICP algorithm, unifying the local point clouds to a global coordinate system of a fan tower footing, and fusing to generate a complete fan structure three-dimensional point cloud field; and calculating a point-to-point distance difference between the historical reference point cloud and the current point cloud, counting a mean value and a maximum value, and judging whether deformation early warning is triggered or not according to a preset threshold value.

The invention discloses a pseudo-random PRI airborne radar multi-frame track-before-detect method based on non-uniform FFT. The method comprises the following steps: firstly, constructing an airborne radar echo model under a pseudo-random PRI framework; then, the target and clutter folding problem in the RD domain is solved under a non-uniform coherent processing framework; and finally, target detection is realized through a multi-frame DP-TBD algorithm. According to the method, radar echo data of a plurality of scanning periods are fused, incoherent accumulation of target energy is realized, and the target detection capability under the background of low signal-to-noise ratio and strong clutter is remarkably improved; meanwhile, the Doppler ambiguity problem caused by non-uniform sampling is effectively solved by using the non-uniform FFT technology, and the representation accuracy of the target signal in the frequency domain is improved.

Embodiments of the present invention provide an uplink transmission method, a terminal, a network device, an apparatus, and a storage medium. The method comprises: receiving precoding matrix indication information; determining, from candidate precoding matrixes, a precoding matrix indicated by the precoding matrix indication information, the candidate precoding matrixes comprising a first type of matrixes and / or a second type of matrixes, the first type of matrixes being determined on the basis of a fully-coherent codeword and a zero matrix, and the second type of matrixes being determined on the basis of a partially-coherent codeword or a non-coherent codeword; and on the basis of the precoding matrix, performing uplink transmission.

System and method for an over-the-air computation (AirComp) scheme for federated edge learning (FEEL) doesn't require channel state information (CSI) at the edge devices (EDs) or edge server(ES). The disclosure adopts the majority vote (MV) principle and defines multiple subcarriers and orthogonal frequency division multiplexing (OFDM) symbols for voting options, which reduces to frequency-shift keying (FSK) over OFDM subcarriers as a special case. Thus, FSK-based over-the-air computation is provided for federated edge learning without channel state information. Since the votes from EDs are separated on orthogonal resources, the scheme eliminates the need for truncated-channel inversion (TCI) at the EDs and allows the ES to detect MV with a non-coherent detector.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may evaluate the plurality of hypotheses based at least in part on the set of power control offset ratios and on a set of evaluation metrics to select at least one of the plurality of hypotheses. Numerous other aspects are provided.

Methods and apparatuses for UL precoding schemes for full coherent UE and non-coherent UE with eight antenna ports are disclosed. In one embodiment, a UE comprises a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a DCI scheduling a PUSCH, wherein the DCI includes a TPMI field indicating information on a precoding matrix; and determine the precoding matrix for the scheduled PUSCH according to the TPMI field.

The embodiment of the invention provides a signal tracking method and device, electronic equipment and a storage medium, and belongs to the technical field of satellite navigation. The method comprises the following steps: determining a reference parameter of a first tracking channel according to a captured to-be-processed signal; synchronizing the reference parameter to a second tracking channel; controlling the first tracking channel and the second tracking channel to perform coherent integration and non-coherent accumulation based on the reference parameters respectively to obtain a first accumulation result and a second accumulation result; and under the condition that the effective accumulation result does not exist, according to the integral result of the coherent integral of the first tracking channel, respectively updating the carrier loop and the code loop of the BPSK signal to obtain an updated reference parameter, and returning to execute the step of synchronizing the reference parameter to the second tracking channel until the effective accumulation result is detected to exist. And generating a to-be-frame-synchronized message based on the effective accumulation result. According to the invention, stable tracking requirements of BPSK and MCSK signals can be compatible.

Disclosed are a communication method and device, the method comprising: a network device sending configuration information of reference signal resources to a terminal device, the configuration information of the reference signal resources corresponding to M reference signal resources, M being a positive integer; first indication information is sent to the terminal device, the first indication information is used for indicating a reference signal resource corresponding to each of the N ports, the reference signal resource corresponding to each of the N ports belongs to M reference signal resources, and the corresponding relation between the N ports and the M reference signal resources is related to the coherence capability of the terminal device, the coherence capability of the terminal equipment is one of complete coherence, partial coherence and incoherence, and N is a positive integer. The method can reduce the overhead of reference signal resources.

The invention relates to a spread spectrum underwater acoustic communication coding and decoding method, which comprises the following steps of: performing dual-channel coding modulation, sequentially performing CRC (cyclic redundancy check) coding, serial-parallel conversion, multi-system error correction coding and interleaving operation on an information bit stream at a transmitting end, then performing spread spectrum modulation on a code element by using a pseudorandom sequence, and finally mapping modulation output of an I channel and a Q channel into a baseband signal, and a spread spectrum underwater acoustic communication signal is formed through pulse shaping and up-conversion processing. According to the method, the communication accuracy is improved through a dual-channel incoherent and coherent redundancy decoding mode and an opportunity cross validation decoding mode.

The invention discloses a vehicle-mounted FMCW radar cognitive anti-interference method and device. The method comprises the following steps: acquiring an interference signal received by a target vehicle-mounted FMCW radar; performing frequency modulation slope estimation on the interference signal by using a fractional order Fourier transform algorithm to obtain an interference frequency modulation slope of the interference signal; based on a preset frequency modulation slope construction function and the interference frequency modulation slope, determining a frequency modulation slope of a target emission signal of the target vehicle-mounted FMCW radar; and performing interference suppression on an initial echo signal received by a pre-acquired target vehicle-mounted FMCW radar based on a target interference signal constructed on the basis of the interference frequency modulation slope to obtain a target echo signal. The method is used for effectively suppressing coherent interference and incoherent interference in a dense traffic scene. Fractional order Fourier transform is adopted to identify coherent interference and estimate the Chirp frequency modulation slope of incoherent interference, and the problems that in the prior art, vehicle-mounted radar mutual interference suppression is insufficient, especially coherent interference and long-duration incoherent interference suppression is insufficient, and the suppression effect robustness is poor are solved.

A user equipment (UE) of a wireless communication network is configured to operate with wireless communication system Radio Access Networks (RANs) using dynamic base station antenna port adaptation and is configurable to operate under one or more of settings for: i) a plurality of active transmission configuration indicator (TCI) states; ii) a COntrol REsource SET (CORESET) index pool with a plurality of CORESET indexes; iii) channel state information (CSI) enhancement including at least one of channel measurement resource (CMR) pairs for a non-coherent joint transmission (NCJT) measurement hypothesis, and CSI report enhancement; iv) codebooks for computing CSI for reduced base station antenna configurations. The UE is configured to operate under one or more of the settings with at least one restriction, and then operated under the configured settings.

The invention relates to the technical field of laser radars, in particular to a vortex light laser radar which comprises a laser emitting unit, an optical receiving unit, an optical modulation unit, a signal detection unit, a signal acquisition and processing unit and a system structure unit. The optical receiving and modulating module divides echo light into a vortex channel and a reference channel through polarization beam splitting. The vortex channel performs orbital angular momentum modulation on echo light by using the receiving modulation unit, converts coherent signal light into annularly distributed vortex light, and filters incoherent noise light through the OAM spatial filtering assembly, thereby realizing spatial separation of signals and noise. The problem of interference of multiple scattered light and background light in a strong scattering medium is effectively solved, the detection signal-to-noise ratio, the maximum detection distance and the target resolution of the laser radar are remarkably improved, and the system is compact in structure, high in engineering practicability and particularly suitable for target detection in underwater, haze and other complex environments.

Systems and techniques are provided for wireless communications. For example, a network device can receive configuration information for redundancy bits associated with scheduled non-coherent transmissions. The network device can receive a plurality of non-coherent transmissions corresponding to a message, the message including a plurality of data bits and a plurality of redundancy bits, wherein each non-coherent transmission of the plurality of non-coherent transmissions is associated with a duty cycle corresponding to the scheduled non-coherent transmissions. The network device can determine error control information for one or more data bits of the plurality of data bits using corresponding redundancy bits of the plurality of redundancy bits, wherein the corresponding redundancy bits are determined based on the configuration information.

An apparatus comprising an antenna array including multiple planar slot antenna elements with integrated feedlines, wherein the positions, orientation angles, and feedline lengths of the antenna elements are mutually uncorrelated to produce spatial and temporal incoherence. The apparatus may include a substrate having irregular ridge faces supporting the antenna elements, a switching circuit configured to activate subsets of the antenna elements according to randomized or pseudo-random sequences, and a controller operatively coupled to the switching circuit.

The application discloses a low-complexity frequency scanning LWA DOA estimation method based on a grouping fusion idea. The main beam direction of a leaky-wave antenna can be changed along with the change of a working frequency, so that the coverage of a radio signal is increased, and the energy consumption of equipment is effectively saved. Meanwhile, the application solves the DOA estimation problem of non-coherent signals and strongly correlated signals which can occur in a real scene. Compared with a traditional DOA estimation method, the method does not need array flow vector to be in a Vandermonde form, the calculation amount is greatly reduced compared with projection and other traditional methods, the required matrix dimension is low, and the implementation steps are simple. The method is not only suitable for single / multi-beam frequency scanning leaky-wave antennas, but also has generalizability for all frequency selection antennas.

Various aspects of the present disclosure relate to a UE, a network entity, a processor for wireless communication, methods, and a computer readable medium for NCJT CSI reporting. The UE receives configuration information indicating a CSI-RS resource group including multiple subsets of RS resources and each subset includes at least two RS resources, transmits NCJT CSI corresponding to M TRPs, and transmits at least one NCJT part CSI corresponding to L (2 ≤ L ≤ M-1) TRPs, and wherein each NCJT part CSI corresponding to L TRPs includes at least one CQI corresponding to L RS resources from the M RS resources.

The application discloses a DOA estimation method and system based on a generative adversarial network. The method first acquires time-domain coherent signals received by a uniform linear array, performs preprocessing, and generates a coherent signal covariance matrix and a corresponding incoherent covariance matrix. Secondly, a covariance matrix reconstruction model is constructed, based on the coherent signal covariance matrix and the corresponding incoherent covariance matrix, a generator of the generative adversarial network is used to extract deep features from the preprocessed coherent signal covariance matrix, and the coherent signal covariance matrix is reconstructed. Then, the MUSIC algorithm is used to estimate and verify the DOA based on the reconstructed covariance matrix. The application improves the precision of coherent DOA estimation while not losing the utilization rate of the array aperture. The application has less parameter quantity, lower calculation complexity, faster covariance matrix reconstruction speed and stronger covariance matrix reconstruction capacity.

The invention discloses an integrated millimeter wave noise source of an MSM photoelectric detector based on waveguide coupling, and relates to the technical field of noise sources. Incoherent light generated by the incoherent light source module is transmitted and diffracted to the MSM photoelectric detector module through the optical waveguide chip module, then optical down-conversion is carried out on the incoherent light, and millimeter wave noise is generated and output. In addition, heterogeneous integration of the incoherent light source module, the optical waveguide chip module and the MSM photoelectric detector module is realized on the noise source substrate. Compared with a photon noise source formed by discrete devices, the photon noise source has the advantages of being small in size and high in robustness.

A precipitation scanning aperture RADAR system comprises at least one transmitting satellite (TX) and a plurality of receiving satellites (RXs) flying in a multi-static formation. The TX emits fixed frequency, pseudo-random, non-repeating phase modulated RADAR energy. Range and Doppler information is extracted from reflected signals received by the RXs to form coherent 2D along track / vertical images, which are combined into a 3D reflectivity map using a power-based incoherent modeling algorithm, such as a Gaussian mixture model. Embodiments implement a spotlight mode in which, for each RX, a plurality of the coherent 2D images obtained during successive coherent processing intervals (CPIs) are incoherently combined, and the satellites adjust their orientations between each CPI to compensate for satellite movement. Inter-satellite timing synchronization of 10 ns or better is sufficient for forming the 3D reflectivity map. The range and Doppler information can be extracted by concurrently demodulating at a plurality of reference frequencies.

Methods, systems, and devices for wireless communications are described. In some examples, a transmitting device associated with one or more noncoherent demodulation reference signal ports may transmit data including a phase change estimation reference signal with multiple reference signal groups. In some examples, multiple different phase change estimation reference signal ports may be code-division multiplexed to transmit the phase change estimation reference signal in the same set of reference signal groups using a different orthogonal cover code for each phase change estimation reference signal port. In some other examples, the different phase change estimation reference signal ports may be used for transmitting the phase change estimation reference signal in the different time-division multiplexed sets of reference signal groups. In such cases, by assigning two phase change estimation reference signal ports to two TDM sets, the two phase change estimation reference signal ports may be time-division multiplexed.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A user equipment (UE) in a communication system is provided. The UE comprising a transceiver, and a controller configured to receive, from a base station, configuration information for enabling precoding matrix indicator (PMI) for single transmit-receive point (STRP) and multi TRP (mTRP) operation on non-coherent joint transmission (NCJT) mode; generate channel state information (CSI) including PMI for sTRP or PMI for mTRP, based on UE capability and configuration associated with partial PMI; and transmit, to the base station, the CSI including the PMI for sTRP or PMI for mTRP.

This invention relates to a method and system for monitoring and enhancing the power of GPS P(Y) signals based on civilian signal tracking. The method employs a carrier tracking loop to stably track civilian satellite navigation signals, generating a local carrier with the same frequency and phase as the GPS satellite navigation digital signal. The GPS satellite navigation digital signal is then orthogonally mixed with the local carrier to output the in-phase branch signal u. I (n) and the orthogonal branch signal u Q (n); the in-phase branch signal u I (n), Orthogonal branch signal u Q (n) Perform low-pass filtering and incoherent integration respectively to obtain the average power P of the baseband signal in the in-phase branch. IB Average power P of baseband signal in orthogonal branch QB The average power P of the baseband signal in the same phase branch IB Average power P of baseband signal in orthogonal branch QB The power enhancement state of the current P(Y) signal is determined by comparing it with the weak-state power threshold of the in-phase branch, the strong-state power threshold of the in-phase branch, the strong-state power threshold of the quadrature branch, and the weak-state power threshold of the quadrature branch.

A method of operation for a dual mode Phase-Locked Loop (PLL) for phase coherent application includes selecting one of a non-coherent mode and a coherent mode. The non-coherent mode includes controlling a Voltage Controlled Oscillator (VCO) with a first error voltage determined by a first Low Pass Filter (LPF), the first LPF configured to filter a first output of a phase detector, the phase detector configured to determine a phase difference between a reference frequency and a feedback signal derived from a VCO frequency generated by the VCO. The coherent mode includes controlling the VCO with the first error voltage and a second error voltage determined by a second LPF of a Proportional and Integral Controller (PIC) configured to filter the first output of the phase detector and by a time variant proportional gain configured to modify a second output of the second LPF.

The invention relates to a method for a radar system and to a radar system for detecting surroundings, comprising: transmission means having a plurality of transmitting antennas operating in parallel for emitting transmission signals which contain one or more sequences of K individual signals; means for changing the phase position of the transmitted individual signals, via which a different phase progression for the transmitting antennas is realized via the K individual signals; receiving means having a plurality of receiving antennas for receiving transmission signals reflected at objects; and signal processing means for processing the received signal; wherein not all transmitting antennas emit the same average transmission level, a non-coherent integration is carried out via certain signal components (TX integration); and wherein this non-coherent TX integration is carried out multiple times under the assumption of different radial relative velocities of an object and, optionally, distances away at which an object is located, and in the non-coherent TX integration, signal components are weighted more heavily the higher the emitted transmission level of the associated transmitting antenna is, and the result of the non-coherent TX integration is used in order to identify the phase progression resulting from the object relative speed and, optionally, object distance, and / or to identify a variable derived therefrom.

This invention discloses a high-repetition-rate interpolation amplification system, relating to the field of high-power laser technology. It employs a three-stage architecture of time-domain separation, parallel amplification, and polarization beam combining. The core idea is to distribute the thermal load and suppress the accumulation of nonlinear effects by interleaving pulses in the time domain, and then synergistically improve the overall performance of the system through incoherent polarization beam combining. Compared with traditional coherent combining schemes, this invention completely eliminates the dependence on precise phase control, extremely high synchronization accuracy, and strict waveform matching, thus providing a highly promising technical path for synchronously achieving high repetition rate, high single-pulse energy, and high average power laser output.

The application discloses a MIMO-OFDM omnidirectional target parameter estimation method based on segmented echo parameter adaptive matching, and specifically comprises the following steps: a two-stage forward-backward average multiple signal classification algorithm is used to estimate the angle parameter of a potential target in a super-resolution manner; a discrete Fourier transform is performed on the echo signal along the antenna dimension to extract segmented echoes, and a known angle-signal correlation term is reconstructed through the accurate angle parameter estimation value of the target; DFT and cross-correlation operation are performed along the subcarrier dimension, a global peak value is obtained through non-coherent accumulation in the cross-symbol dimension, and the distance parameter of the target is estimated; a cross-symbol complex sequence is taken out and point DFT is performed to obtain a Doppler spectrum, and then the speed parameter of the target is estimated; and the parameter estimation of all targets is completed through the above steps. The application overcomes the defect that the overall performance is degraded due to error propagation in the existing successive estimation framework, and the parameter estimation performance is significantly improved compared with the existing successive estimation method.