423 results about "Non coherent" patented technology

Provided is a detection method of spaceborne GNSS-R original intermediate frequency coherent reflection signals in ocean, polar and inland water areas, including: acquiring spaceborne GNSS-R original intermediate frequency signal data of TDS-1 or CYGNSS and preprocessing the data; selecting coherent detection feature engineering; setting data labels of different scenes and coherent and incoherent reflected signals; dividing a training set and a test set; and training and testing a multimode-oriented hybrid model for coherent and incoherent detection and classification of spaceborne GNSS-R signals, using the training set to train a model, applying a trained detection model to a test data set, and comparing and evaluating obtained detection results with a classical coherent detection algorithm.

Systems, methods, and instrumentalities are described herein for joint transmission (JT) channel state information (CSI) reporting. Joint transmission CSI may be coherent JT CSI or non-coherent JT CSI. Feedback overhead may be reduced, for example, if reporting CSI for multiple transmission / reception points (TRPs). Precoding matrix indicators (PMIs) and / or co-phasing information for TRPs in JT (e.g., coherent JT or non-coherent JT) may be reported. A wireless transmit / receive unit (WTRU) may be configured to employ operations to reduce feedback overhead and / or report PMIs and / or co-phasing information for TRPs in JT.

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.

A terminal according to one aspect of the present disclosure includes a control section that determines a precoder, based on a codebook for transmission using more than four antenna ports, when a codebook subset indicating “non coherent” or “partial coherent” is configured, and a transmitting section that performs uplink full power transmission, based on the precoder. According to one aspect of the present disclosure, UL full power transmission using more than four antenna ports can be appropriately controlled.

The invention discloses a weak signal noise reduction and capture method and device, and the method comprises the steps: carrying out the carrier separation of a collected to-be-processed digital signal, obtaining an initial signal, grouping the initial signal, and obtaining a data block with a preset length; and performing coherent accumulation on the data blocks with the preset lengths to generate a coherent accumulation result. And dividing the data blocks with the preset lengths into odd-numbered groups of data blocks and even-numbered groups of data blocks, respectively performing incoherent accumulation on the odd-numbered groups of data blocks and the even-numbered groups of data blocks according to coherent accumulation results to generate corresponding incoherent accumulation results, and determining a larger value from the obtained incoherent accumulation results as a judgment threshold. And comparing the judgment threshold value with a preset capture threshold value, and when the judgment threshold value is greater than or equal to the preset capture threshold value, determining that the signal capture is successful. By adopting the method, the coherent accumulation frequency can be reduced, the operand and complexity are reduced, the weak signal is accurately and quickly captured, and the weak signal capturing efficiency is improved.

The invention discloses a composite loop tracking method of an anti-interference navigation signal receiver. The method comprises the following steps: copying a pseudo code and a carrier corresponding to a satellite signal based on a roughly captured signal; performing coherent operation to obtain a coherent integral value; performing FLL frequency discrimination, PLL phase discrimination and FFT frequency discrimination on the coherent integral value, and performing weighting processing to obtain a frequency error; carrying out carrier loop filtering on the frequency error to output a carrier loop tracking result; performing incoherent accumulation to obtain an incoherent integration result, and performing DLL phase discrimination to obtain an epoch code loop phase difference; performing code loop filtering on the epoch code loop phase difference to output a code loop tracking result; calculating a first frequency control word corresponding to the code loop according to the wave loop tracking result; and controlling code loop updating based on the first frequency control word and the code loop tracking result. According to the invention, stable tracking of navigation signals in different dynamic and different interference scenes can be realized.

A first UE may identify, in at least one round of a federated learning procedure, at least one gradient update based on local data and a local copy of a machine learning model associated with the federated learning procedure. The first UE may transmit, based on a non-coherent OTA aggregation scheme and for a network node, an indication of the at least one gradient update via a set of resources associated with the non-coherent OTA aggregation scheme. The indication of the at least one gradient update may include at least one sequence. A transmit power associated with the at least one sequence may be based at least in part on a magnitude of the at least one gradient update. Based on the non-coherent OTA aggregation scheme, the network node may obtain the combined gradients associated with all participating UEs by averaging the received power over the set of resources.

The invention provides an underwater acoustic communication dual-mode demodulation method and system based on minimum frequency shift keying, and the method comprises the steps: receiving an underwater acoustic signal, carrying out the preprocessing, and carrying out the channel estimation of a training sequence in the underwater acoustic signal; calculating a phase change index according to a channel estimation result; when the phase change index is higher than a set bit error rate threshold value, processing the received signal in an incoherent demodulation mode; and when the phase change index is lower than a set bit error rate threshold value, processing the received signal in a coherent demodulation mode. The method has the advantages that the problem of insufficient applicability of a single demodulation mode in different underwater acoustic communication environments is solved; it is ensured that the system maintains good communication performance under different channel conditions; the problem of information lag can be avoided, the limitation of a traditional single demodulation mode is broken through, and the reliability and robustness of the system in a variable underwater acoustic channel are remarkably improved.

In order to solve the problems of short weak target detection distance, long detection time, few detection cycles and the like of the existing traditional active sonar, the invention provides a weak target robust high-gain detection method by using continuous wave MIMO sonar and Doppler filtering. According to the method, frequency diversity continuous wave pulse signals with low cross correlation are designed according to the number of transmitting transducers and the number of detection periods of the MIMO sonar, then the designed frequency diversity continuous wave pulse signals are continuously transmitted by using the MIMO sonar and a multi-period transmitting mode, then Doppler filtering processing is performed on echoes, and the frequency diversity continuous wave pulse signals with low cross correlation are obtained. Doppler filtering output of all frequency diversity continuous wave pulse signals is obtained, coherent accumulation and non-coherent accumulation are carried out on the Doppler filtering output, stable high-gain accumulation output is obtained, in the process, Doppler filtering of the continuous wave pulse signals can be fully utilized to suppress reverberation, multi-period accumulation is utilized to suppress noise, and the noise suppression effect is improved. And the weak target detection performance superior to that of the traditional active sonar is obtained.

The invention discloses a foreign matter detection method and system based on millimeter wave radar three-dimensional point cloud imaging, and the method comprises the steps: carrying out the Fourier transform of a distance dimension and a speed dimension, achieving the coherent accumulation, and effectively improving the signal energy; incoherent accumulation is achieved by means of a multi-channel technology, target information is extracted by applying a two-dimensional CFAR algorithm, so that the anti-interference capability in the recognition process is enhanced, the problem that clutter and noise interference in the environment is extremely serious is effectively solved, the detection precision is improved, meanwhile, a clustering algorithm and multi-frame point cloud data fusion are combined to solve the point cloud data sparsification problem, and the detection accuracy is improved. An overfitting phenomenon occurring when a classification algorithm model is directly used is prevented, the efficiency of target feature extraction is improved, and remote detection is broken through.

The invention provides a circumferential synthetic aperture radar imaging method, which comprises the following steps: acquiring a transmitting signal and an echo signal of radar circular motion, and preprocessing the transmitting signal and the echo signal to obtain a preprocessed echo signal; a compressed sensing method is adopted to convert a signal estimation and recovery problem into a norm minimization problem for signal filtering, and a target echo signal is obtained; dividing a plurality of sub-apertures by adopting a back projection algorithm, carrying out gridding processing on an imaging region, and calculating echo time delays of points in a grid and each position of the radar; and performing signal compensation on a target echo signal according to the echo time delay, performing azimuth focusing through coherent superposition processing to generate a plurality of corresponding sub-images, and performing step-by-step non-coherent fusion on the plurality of sub-images to obtain a circumferential SAR image. According to the invention, a small amount of effective data can be fully utilized for high-quality imaging, and high-resolution image quality is maintained while the imaging speed and the processing efficiency 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.

The invention discloses a shipborne GNSS-R polar region ice region environment oil spill detection method. The method comprises the following steps: establishing a scattering transmission model of a polar region ice region on seawater, sea ice and oil film surfaces based on a GNSS-R signal; based on a coherent signal and incoherent signal accumulation processing method, an oil film existence area is identified; and carrying out feature extraction on the GNSS-R signal of the sea surface ice-oil mixture, and determining whether the polar region ice region environment spills oil or not. The shipborne GNSS-R polar region ice region environment oil spill detection technology provided by the invention has a wide application prospect. According to the ship-borne GNSS-R polar region ice region environment oil spill detection technology based on the dual-polarized antenna, the problem that targets such as sea ice blocks or oil spill are difficult to recognize can be solved, the detection and recognition accuracy of polar region navigation ice region oil spill can be improved, normalized monitoring of polar region navigation ice region oil spill and self-monitoring of navigation ships can be achieved in an assisted mode, and the detection and recognition efficiency of the polar region navigation ice region oil spill is improved. Technical guarantee is provided for polar region shipping safety, ice region strategic resource development and green and safe development of oil and gas storage and transportation in China, and the method has very important research value and popularization significance.

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.

Some examples of the techniques described herein may facilitate transmissions using three antenna ports. For instance, some of the approaches described herein may enable uplink sounding (e.g., sounding reference signal (SRS)) transmission using three transmit antenna ports. In some examples, a four-port SRS resource may be reused for three-port SRS transmission. In some examples, a two-port SRS resource and a one-port SRS resource may be utilized for a three-port SRS transmission. Several aspects of SRS improvements may be provided to support uplink transmissions with three antenna ports. For instance, a coherent or non-coherent uplink codebook may be specified to facilitate three-antenna-port codebook-based transmissions. Some of the approaches may manage uplink transmission power or SRS resource signaling. For example, some of the techniques may provide SRS port to cyclic shift mapping or SRS power control.

The invention discloses an incoherent index modulation method and system based on a fluid antenna, and belongs to the field of wireless communication. A plurality of fluid antenna transmitting modes are preset for a fluid antenna wireless communication system, and a beam forming vector corresponding to each transmitting mode is optimized by using a closed expression of a fluid antenna space coding gain, so that a transmitter can transmit a phase shift keying modulation symbol while transmitting the phase shift keying modulation symbol; spatial bit information can be implicitly transmitted through a cyclic shift value of a fluid antenna emission mode index value, and the whole communication process does not need to depend on channel state information, so that the multiple-input-multiple-output communication method for fluid antenna energization without channel estimation is realized.

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.

Systems, methods, and tools for joint transmit (JT) channel state information (CSI) reporting are described herein. The joint transmit CSI may be coherent JT CSI or incoherent JT CSI. For example, if CSI for multiple transmission / reception points (TRPs) is reported, feedback overhead may be reduced. A precoding matrix indicator (PMI) and / or co-phase information for a TRP in a JT (e.g., a coherent JT or a non-coherent JT) may be reported. A wireless transmit / receive unit (WTRU) may be configured to employ operations to reduce feedback overhead and / or report PMI and / or co-phase information for a TRP in a JT.

The invention discloses an incoherent chaos communication method and device based on deep learning, and relates to the field of data processing, and the method comprises the steps: obtaining a chaos receiving signal to be demodulated, carrying out the power spectrum density estimation, obtaining a PSD sequence, inputting the PSD sequence into a trained chaos receiving signal demodulation model, receiving the PSD sequence through an input layer, enabling the PSD sequence to pass through a first BiLSTM layer, and carrying out the demodulation of the chaos receiving signal through a second BiLSTM layer; a first time domain feature of the PSD sequence is extracted and then passes through a self-attention layer to obtain a first intermediate feature, the first intermediate feature passes through a first Dropout layer to obtain a second intermediate feature, the second intermediate feature passes through a second BiLSTM layer to extract a second time domain feature of the PSD sequence and then passes through a second Dropout layer to obtain a third intermediate feature; and inputting the third intermediate feature into a full connection layer and a Softmax layer for feature integration to obtain a probability distribution vector, and performing maximum likelihood judgment on the probability distribution vector through a classification layer to obtain an estimated binary information bit. The problem that an existing chaotic communication system is low in spectrum efficiency is solved.

The invention relates to the field of communication, in particular to a spread frequency hopping signal capturing method based on Doppler and spread frequency hopping pseudo code search. Comprising the following steps: step 1, down-conversion; step 2, searching for a large step frequency; step 3, caching the data at regular time; step 4, de-hopping; step 5, downsampling; step 6, searching for a small step frequency; step 7, sliding correlation; step 8, interpolation: performing high-power interpolation processing on the sliding correlation output sequence; step 9, phase rotation: carrying out phase rotation processing on the data segments before coherent accumulation; step 10, performing coherent accumulation during a frequency hopping cycle; step 11, carrying out incoherent accumulation between symbols; and step 12, inter-symbol capture judgment. According to the invention, the bandwidth of the data to be processed is effectively reduced, and the purposes of saving hardware resources and improving the capture accuracy of the spread frequency hopping signals are achieved.

The invention relates to a GMSK signal incoherent demodulation method and device. The method comprises the following steps: obtaining a state grid chart by utilizing multi-symbol detection; obtaining a matched filter according to the state grid chart; enabling the received baseband signal to pass through a matched filter to obtain a signal correlation value; obtaining a branch metric value of each state node in the baseband signal according to the signal correlation value; updating the path metric value of each state node according to the branch metric value; reserving a path corresponding to the maximum path metric value of each state node, and taking the path as a surviving path of each state node; and backtracking the survival path of each state node to obtain demodulation data of the baseband signal. According to the method provided by the invention, the state grid is obtained through multi-symbol detection, and multiple pieces of symbol information are combined, so that the problem of insufficient memory length in related technologies is solved, errors are prevented from spreading along the grid, and the error probability of symbol judgment during demodulation is reduced.

A user terminal according to one aspect of the present disclosure includes: a control section that, when capability information that indicates that full power transmission is supported is transmitted, and when a non coherent or partial and non coherent codebook subsets are configured, assumes that downlink control information can indicate a fully coherent codebook subset; and a transmitting section that performs the full power transmission by applying the fully coherent codebook subset to uplink transmission based on the downlink control information. According to one aspect of the present disclosure, it is possible to appropriately control full power transmission.

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.

A method and apparatus are disclosed for rate matching. In one embodiment, a user equipment is configured to receive at least two physical downlink shared channels, PDSCHs; a first PDSCH of the at least two PDSCHs being associated with a first set of cell-specific reference signal, CRS, patterns and a second PDSCH of the at least two PDSCHs being associated with a second set of CRS patterns; and the at least two PDSCHs being rate matched around at least one of the first set of CRS patterns and the second set of CRS patterns. In another embodiment, a network node is configured to transmit the at least one PDSCH of at the least two PDSCHs; and the at least two PDSCHs being rate matched around at least one of the first set of CRS patterns and the second set of CRS patterns.

There is provided a method in a UE, for adapting a codebook based on the number of layers for transmissions. The method comprises: receiving a configuration of a codebook to use for uplink transmissions; mapping a list of indices to precoders of the codebook according to a rank of the precoders, wherein the list of indices are mapped to values of a parameter ("N"), first by increasing values of a number of transmitted layers and then by increasing values of N for a given number of layers; and transmitting a layer on an antenna port that corresponds to a value of the parameter N.

The invention provides a satellite-ground data demodulation processing output control method, device and equipment, and the method comprises the steps: determining a working mode, when the working mode is a satellite-ground communication mode, carrying out the satellite-ground two-way communication after completing the aiming, capturing, tracking and link building of a satellite-ground laser link through cooperation of a satellite-ground demodulation processing module and a laser communication load; when the working mode is an incoherent laser communication service mode, downlink signal light is sent to incoherent receiving equipment through the laser transceiving front end and the optical subsystem, power detection, filtering and photoelectric conversion of the downlink signal light are jointly completed through the incoherent receiving equipment and incoherent detection equipment, and an electric baseband signal is output to a high-speed digital baseband; through different data processing modes in different communication modes, the data processing efficiency is ensured, demodulation, decoding and output of signals are completed in an incoherent laser communication service mode, and the ground data processing efficiency is effectively improved.

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.

The invention discloses a millimeter wave radar target detection method, device and equipment based on MIMO, and belongs to the technical field of wireless communication, and the method comprises the steps: sequentially carrying out windowing processing and FFT processing on a three-dimensional radar data cube, and obtaining speed information and distance information; then, on the basis of the speed information and the distance information, incoherent accumulation is carried out to obtain a distance-speed matrix, the signal-to-noise ratio can be effectively increased, the power of clutter noise can be effectively reduced, then CFAR processing is carried out on the distance-speed matrix to obtain a processed distance-speed matrix, and the distance-speed matrix is subjected to non-coherent accumulation; it is ensured that a radar system achieves a constant false alarm probability in a complex background noise and clutter environment, meanwhile, the discovery probability is improved as much as possible, the occurrence frequency of false alarms and missed alarms is effectively reduced, and finally Doppler compensation and angle estimation are sequentially carried out on the processed distance speed matrix, so that the detection accuracy is improved. The accuracy and precision of target detection can be effectively improved.

This disclosure provides systems, methods, and devices for wireless communication that support joint transmission operations which include non-coherent and coherent joint transmissions. In a first aspect, an apparatus includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured receive an indication of channel state information (CSI) reference signal (RS) (CSI-RS) resources and transmit a CSI report based on the CSI resources. The CSI report includes precoding information and channel quality information. The at least one processor is configured to receive an indication of a joint transmission including a non-coherent joint transmission and a coherent joint transmission. The at least one processor is configured to receive the joint transmission corresponding to the indication. Other aspects and features are also claimed and described.

A receiver includes a demodulator having a configurable correlator bank that helps with fast and robust signal detection. The demodulator detects arrival of a first preamble symbol using a first correlator bank configuration. The demodulator makes a course frequency offset estimation after detection of the first preamble signal and the receiver adjusts a frequency used by a mixer based on the coarse frequency offset estimation. The demodulator confirms signal arrival detection with detection of a second preamble symbol. A coarse timing estimation is generated using a second correlator bank configuration using a multi-symbol observation period. A fine frequency offset estimation is made using a third correlation bank configuration. A fine timing estimation is made using a fourth correlation bank configuration. The demodulator then despreads received symbols using a fifth correlator bank configuration.