132 results about "Non coherent" patented technology

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fan structure three-dimensional point cloud field; and calculating a point-to-point distance difference between the historical reference point cloud and the current point cloud, counting a mean value and a maximum value, and judging whether deformation early warning is triggered or not according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.

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.

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 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.

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.

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 belongs to the technical field of wireless communication, and discloses a backscattering communication method, device and system based on multi-carrier differential modulation t The transmission vector at t-1 time is expanded into a symmetric and full-rank subcarrier block transmission matrix, the transmission vector u t is subjected to rectangular differential modulation to obtain the transmission vector at t time, and then is converted into a time-domain data frame and mapped into a reflection coefficient; and the excitation source signal is modulated by means of an impedance network to generate a backscattering signal. Since differential modulation transmits information based on the difference between adjacent symbols, the channel state information is cancelled in the process of data detection at the receiving end, and the original sending data can be recovered by non-coherent detection of the receiving signal at the receiving end, without a complex cascaded channel estimation process, so that the complexity of the multi-carrier backscattering communication system is effectively reduced.

The application discloses a kind of non-coherent full-color polarized edge imaging system and method based on reverse design photonic crystal, belong to optical imaging and computational optics technical field.System includes non-coherent light source module, polarization-dependent photonic crystal (PDPC) device, imaging detection module and image processing module;PDPC device is made of different all-dielectric material stack, with each layer thickness as trainable parameter, iteration optimization by gradient descent optimization algorithm, with ReLU function constraint lower limit of thickness, obtain optimal structure.Method by collecting orthogonal linear polarization state intermediate image, by spatial difference decomposition, using polarization difference optical transfer function satisfying first-order spatial differential condition, output edge enhancement image containing full color and polarization information.The application does not need coherent light source, it is stable in 400-700nm visible light band Work, high imaging efficiency, contrast ratio is optimal, provide feasible scheme for large-aperture broadband optical simulation processing.

The invention relates to a method for a radar system and to a radar system for environment detection, comprising: a transmitting device having MTX > = 2 transmitting antennas operating in parallel for transmitting a transmission signal, said transmission signal comprising one or more sequences of K individual signals; means for changing the phase of the transmitted single signal; a receiving device having an MRX > = 1 receiving antenna for receiving a transmission signal reflected on an object; and signal processing means for processing the received signals, in which coherent integration or incoherent integration (TXRX integration) is performed on the basis of the MRX received signals arriving at the receiving antenna or on the basis of the signals derived from the received signals and on the basis of the MTX signal components, i.e. On the basis of the MTX MRX values, respectively, and the signal processing means for processing the received signals, in which coherent integration or incoherent integration (TXRX integration) is performed on the basis of the MRX received signals arriving at the receiving antenna. A value is given at a time and performed multiple times assuming different radial relative speeds and optionally distances of the object, and the phase step resulting from the object relative speeds and optionally object distances and / or a quantity derived therefrom is identified using the results of the multiple TXRX integration.

The application provides a terahertz ISAC system design method based on delay alignment modulation and active RIS, and the steps are as follows: firstly, an active RIS assisted terahertz communication and sensing integrated (ISAC) system is built, and the signal received by the user and the signal signal-to-noise ratio of the terahertz ISAC system are calculated; secondly, the non-coherent accumulation is used to calculate the illumination power at the static target, and the received thermal noise at the static target and the power consumed by the active RIS are calculated based on the active RIS; finally, the reflection coefficient of the active RIS and the transmission beam forming vector at the DFBS are jointly designed to maximize the illumination power of the target, and the semi-definite program relaxation technology is used for solving. The application optimizes the transmission beam forming vector of the DFBS and the reflection coefficient of the active RIS, improves the sensing performance and guarantees the communication quality; the terahertz ISAC system utilizes the unique advantages of RIS and DAM, and provides incomparable benefits in the aspects of sensing and communication performance.

The invention belongs to the technical field of microwave electric field measurement, and relates to a microwave electric field measurement sensitivity improving method and system based on an optical array, and the method comprises the steps: 1, respectively constructing a detection optical field and a coupling optical field to interact with a sample cell, and generating a four-channel Rydberg EIT array; 2, after the introduced intrinsic microwave field and the signal microwave field interfere with each other, intermediate-frequency signals are generated on spectrums, and four beams of intermediate-frequency signal spectrums with mutually independent spaces and phases are generated; 3, the four beams of detection signals are synchronously input into a four-channel photoelectric detector for parallel acquisition and superposition processing, and the microwave frequency band electric field detection sensitivity is improved; the system comprises a laser, an atomic gas chamber, a microwave signal radiation unit, an SAS frequency locking system and a reference EIT frequency locking system. According to the invention, incoherent noise of each channel is suppressed through a noise cancellation mechanism, the signal-to-noise ratio of the system is greatly reduced, and finally, the sensitivity is improved by 6 dB in electric field detection of a microwave frequency band.

The invention discloses a wireless coherent full-duplex double-sided bidirectional ranging method and system. The method comprises the following steps: setting two wireless incoherent radars to be respectively positioned on two sides to be subjected to ranging; in a full duplex transmission mode between the two radars, the two radars respectively emit linear frequency modulation continuous wave signals and receive signals from the other radar; extracting a synthesized beat frequency signal from the received signal; determining the maximum value of the periodogram, and estimating the distance of the line-of-sight path from the beat frequency signal; respectively calculating phase estimation values of up and down frequency modulation according to the up and down frequency modulation slopes, and calculating a displacement step estimation value through the phase estimation values of the up and down frequency modulation; and performing periodic error modeling and correction on the plurality of displacement step length estimation values to obtain an absolute position estimation value. According to the method, beat frequency estimation and coherent phase tracking are combined, high-precision transmission can still be achieved in a complex and severe environment, beat frequency estimation is adopted for distance measurement, and the absolute position is measured with millimeter-level precision.

The application discloses a CE-OFDM communication and sensing integrated anti-nonlinear DOA estimation method, belongs to the field of communication sensing, and comprises the following steps: generating a 0dB peak-to-average power ratio CE-OFDM signal at a transmitting end, so that the CE-OFDM signal can drive a power amplifier to work in a saturation region, thereby avoiding nonlinear distortion while ensuring high power amplifier efficiency. A uniform linear array is used to receive signals at a receiving end, the signals are decomposed into a frequency domain through discrete Fourier transform, narrowband MVDR spatial spectra are independently calculated for each subcarrier frequency point, wideband spatial spectra are obtained through non-coherent fusion, and finally high-precision DOA estimation is realized through peak value searching. The application fundamentally suppresses power amplifier nonlinear distortion by using the constant envelope characteristic of CE-OFDM, avoids eigenvalue decomposition and source number estimation by combining the IMVDR algorithm, supports frequency point level parallel calculation, and realizes high-precision and low-complexity DOA estimation while ensuring communication reliability.

The application discloses a satellite signal lock loss relocation method, system, device and storage medium, the method comprises the following steps: taking the carrier NCO value and code NCO value before lock loss as the center, a two-dimensional search range is constructed; searching in the two-dimensional search range, calculating the non-coherent accumulation value of each grid point, and finding the maximum non-coherent accumulation value; according to the size of the maximum non-coherent accumulation value, judging the peak interval to which the maximum non-coherent accumulation value belongs; when the maximum non-coherent accumulation value belongs to the first peak interval, a traditional frequency-locked loop reentry locking mode is adopted; when the maximum non-coherent accumulation value belongs to the second peak interval, a high-sensitivity reentry locking mode is adopted. The application improves the lock loss relocation sensitivity under weak signals, effectively guarantees the availability of the receiver under weak signals, and solves the problem of lock loss relocation under weak signals.

In order to solve the problem that the detection performance of an active sonar is seriously reduced due to channel fluctuation, target intensity fluctuation and strong reverberation backgrounds, the invention provides a single-frame and multi-frame integrated reverberation suppression and target enhancement method for a distributed MIMO sonar, which comprises the following steps: firstly, carrying out space-time processing on all receiving ends of the distributed MIMO sonar to obtain transmitting-receiving channel output; carrying out incoherent delay summation on all transmitting-receiving channel outputs to obtain single-frame detection output; then, single-frame detection output serves as input of multi-frame processing, and a multi-frame Gaussian mixture model is used for restraining reverberation background and enhancing moving target bright spots; and finally, processing the output of the multi-frame Gaussian mixture model by using the multi-frame high-order nonlinear cumulant. Compared with a traditional method, the method has the advantages that under the conditions of channel fluctuation, target intensity fluctuation and strong reverberation background, the strong reverberation background can be effectively inhibited, and more stable and higher-quality target bright spot detection output is obtained.

A method for measuring the thickness of a semiconductor structure includes illuminating the semiconductor structure with non-coherent and non-parallel light from at least one light source, and acquiring at least one image of the semiconductor structure illuminated by the light source using a camera. The at least one image includes separate images of a first color, a second color, and a third color, where the first, second, and third colors are distinct from each other. A thickness map is generated for at least two layers of the semiconductor structure based on the images of the first, second, and third colors and reference images of a reference silicon wafer in the first, second, and third colors.

The invention discloses a multi-path optical fiber testing system and method based on a port matrix and a medium, and the system comprises a port matrix module which comprises M * N matrix units, and each matrix unit comprises an input port, a first output port and a second output port; the dimmable processing unit is embedded in the matrix unit and comprises a test branch and a cascade branch; the beam combination transmission module is connected with the second output port and performs incoherent beam combination on the M paths of test signals in the same column to form a beam combination signal; the intelligent control module is used for generating a light splitting weight matrix according to a test requirement input by a user, and sending a control instruction to the adjustable light processing unit according to the light splitting weight matrix, so that the adjustable light processing unit distributes an input signal to the test branch and the cascade branch according to the light splitting weight matrix; and the multi-parameter detection module is used for calculating the beam combining signal to generate a detection result. By combining matrix signal distribution, incoherent beam combination and a dynamic calibration algorithm, concurrent testing of multiple paths of optical fibers is realized.