19 results about "Multipath delay" patented technology

A channel feedback method, apparatus and system. The method comprises: acquiring multipath component information of a communication channel between a first device and a second device; on the basis of a self-supervised neural network, performing processing on the multipath component information and second channel information, so as to obtain intermediate information; and sending the intermediate information, wherein the second channel information is determined on the basis of first channel information and multipath delay information, the second channel information comprises a variable channel impulse response (CIR), the first channel information comprises a channel frequency response (CFR), which is obtained by means of a measurement, and the intermediate information and the multipath component information are used for determining a reconstructed CIR. By means of the solution, channel feedback is performed in combination with multipath component information and a self-supervised neural network, thereby reducing measurement overheads and feedback overheads.

The invention discloses a communication method and device. The method comprises the following steps: a sending end determines the length of a guard interval sequence according to a first parameter; the first parameter comprises at least one of the following items: the number of effective subcarriers of the scheduling bandwidth, an inverse fast Fourier transform (IFFT) length, a modulation and coding strategy (MCS), and a ratio of the number of occupied subcarriers to the number of effective subcarriers; a first symbol sequence is generated, the first symbol sequence comprises a guard interval sequence, and the first symbol sequence is a symbol sequence before precoding conversion; and outputting the first symbol sequence. Thus, when the sending end determines the length of the guard interval sequence, parameters of different dimensions such as the number of effective subcarriers, the IFFT length, the MCS, the ratio of the number of occupied subcarriers to the number of effective subcarriers and the like are considered, so that multipath delay interference of a single-carrier system is reduced conveniently through the guard interval sequence, and the transmission performance of the single-carrier system is improved.

The application discloses a power line channel estimation method, device and medium, and the method comprises the following steps: S1, a Vandermonde structure manifold matrix containing multipath delay information is constructed; S2, based on the Vandermonde structure manifold matrix, a super-complete manifold matrix containing all potential delay point positions is constructed, and a channel estimation problem is converted into a sparse representation problem; S3, an unconstrained optimization objective function is constructed; S4, singular value decomposition is performed on received OFDM pilot signal data of multiple time periods, a signal subspace is extracted, and compression and noise suppression of sampling data are realized; S5, the data compressed through step S4 is substituted into the optimization objective function constructed in step S3 to obtain high-precision multipath delay estimation; and S6, based on the multipath delay estimation, a complete power line channel response is reconstructed, and high-resolution and high-robustness channel estimation results are obtained in a power line channel environment with high noise and strong multipath interference at a relatively low calculation complexity.

The application is suitable for the technical field of filter data optimization, and provides a filter performance automatic evaluation method and system.The method comprises the following steps: generating a time delay shaping strategy according to the deviation direction and deviation amount between the current equivalent multipath delay spread parameter and the historical optimal interval; and performing time delay shaping processing on the echo signal of an input target filter based on the time delay shaping strategy, so that the equivalent multipath delay spread of the shaped echo signal falls into the historical optimal interval when entering the target filter, so that the echo peak value resolution is in an optimal state.The application does not depend on changing the structure of the filter itself, but realizes performance optimization by regulating the input signal characteristics, can further tap the processing potential of the existing filter, and improves the stability of the filtering effect and the accuracy of subsequent target identification.

The application discloses a signal processing method of power carrier communication based on OFDM modulation, relates to the technical field of power carrier communication, and comprises the following steps: S1, cyclic prefix and guard interval design and insertion; S2, improved synchronization algorithm for frequency offset processing; S3, noise suppression optimization of a front-end signal processing module; S4, parallel processing architecture design and task allocation; S5, channel estimation at a receiving end; S6, frequency domain equalization processing; S7, OFDM demodulation processing; and S8, symbol synchronization and data recovery. Through the steps S1 and S2, the effects of effectively resisting power line channel multipath delay, reducing inter-symbol interference and inter-carrier interference are achieved. Through the steps S3, S5 and S6, the effects of accurately identifying power line impulse noise and Gaussian noise characteristics and dynamically suppressing noise are achieved. Through the steps S4 and S8, the effects of improving signal processing efficiency by using a parallel processing architecture and avoiding processor overload are achieved, and meanwhile, the data error correction capability is enhanced by convolution coding or Turbo coding, so that the real-time performance and reliability of high-speed data transmission are ensured.

The invention discloses an ad hoc network duplex voice long-distance transmission method based on OFDM (Orthogonal Frequency Division Multiplexing), relates to the technical field of wireless communication, and effectively solves the contradiction of low spectrum efficiency and insufficient anti-interference capability of a traditional OFDM system in low-rate voice transmission through an adaptive subcarrier allocation and parameter optimization mechanism. The total bandwidth is dynamically divided into a voice dedicated subcarrier group and a data service subcarrier group, and a narrower subcarrier interval is adopted for a voice service to accurately match the bandwidth requirement of the voice service, so that the spectrum utilization rate is greatly improved on the premise of ensuring the voice quality, and the bandwidth of the voice service is greatly improved in the face of complex and changeable multipath interference in a riding environment. The cyclic prefix length is dynamically adjusted according to the channel maximum multipath delay estimated in real time, it is ensured that inter-symbol interference caused by multipath can be completely eliminated, frequency spectrum resource waste caused by a fixed long cyclic prefix is avoided, and intelligent linkage of the volume and the riding state is achieved.

This application provides a method and apparatus for determining a subarray of XL-MIMO line-of-sight. The method for determining a subarray of XL-MIMO line-of-sight includes: acquiring the channel impulse response of multiple antenna elements in a MIMO array; for each antenna element, calculating a first metric and a second metric based on the channel impulse response of the antenna element; the first metric characterizing the received energy level, and the second metric characterizing the degree of multipath delay dispersion; establishing a negative correlation coupling model between the first metric and the second metric based on a sample set composed of the first metric and the second metric of the multiple antenna elements; and determining a target antenna subarray from the MIMO array according to the negative correlation coupling model; wherein the multipath delay dispersion of the target antenna subarray is suppressed under the condition of satisfying the received energy requirements.

This application relates to a multi-source sensor fusion localization method and system for partial discharge in primary equipment of a substation. The method includes: constructing a digital twin model based on the equipment's three-dimensional geometric parameters, electromagnetic properties of the internal medium, and acoustic properties; acquiring ultra-high frequency electromagnetic wave signals and acoustic emission signals and performing multipath decomposition to obtain electromagnetic wave multipath delay cluster feature vectors and acoustic wave multipath delay cluster feature vectors; calculating path mismatch degrees for all hypothetical source point locations based on the feature vectors to obtain a path dependency matrix; calculating a wave velocity collaborative correction factor for each hypothetical source point location based on this matrix, and performing joint likelihood estimation by combining electromagnetic wave and acoustic wave path mismatch degrees to obtain a preliminary spatial likelihood distribution; and performing variational Bayesian inference on this distribution to obtain the localization result and confidence interval evaluation index. This method can effectively eliminate false localization points and significantly improve the accuracy and reliability of partial discharge localization in complex structural equipment.

This invention relates to the field of wireless communication transmission technology and discloses a data transmission method for weak network environments. The method includes: acquiring the channel impulse response of the first and second symbol periods of a wireless channel; extracting multipath delay parameters, signal amplitude parameters, and discrete time axis coordinates; mapping the parameters to a spatiotemporal parametric coordinate system; generating first and second channel feature surfaces; calculating the curvature variance of the first channel feature surface; when the curvature variance is lower than a preset correlation distortion threshold; extending the second channel feature surface along the evolution gradient trend to generate a predicted channel feature surface; thereby determining the equalizer tap coefficients and compensating for data symbol distortion. This invention enhances transmission reliability in highly dynamic weak network environments by locking the gradient divergence path generated by the linear algorithm in a Doppler shift environment through geometric surface physical continuity constraints.

The application discloses a long-distance duplex voice transmission method based on OFDM in an ad hoc network, and relates to the technical field of wireless communication.The application effectively solves the contradiction between low spectral efficiency and insufficient anti-interference capability of a traditional OFDM system in low-rate voice transmission through an adaptive subcarrier allocation and parameter optimization mechanism, dynamically divides the total bandwidth into a voice-dedicated subcarrier group and a data service subcarrier group, adopts a narrower subcarrier interval for voice service to accurately match the bandwidth requirement, thereby greatly improving spectral utilization rate under the premise of ensuring voice quality, and dynamically adjusts the cyclic prefix length according to the real-time estimated maximum multipath delay of a channel to ensure that the inter-symbol interference caused by multipath can be completely eliminated, and the spectral resource waste caused by a fixed-length cyclic prefix is avoided, and the intelligent linkage of volume and riding state is realized.

DMRS transmission methods and apparatuses, a device, and a storage medium, which relate to the technical field of communications. A method is executed by a terminal device. The method comprises: using K physical resource blocks (PRBs) as a unit to send or receive a DMRS of a data channel on at least one DMRS port, wherein the K PRBs include a plurality of DMRS ports, DMRS ports included in different PRBs are not completely the same, the at least one DMRS port is indicated by a network device from among the plurality of DMRS ports, and K is an integer greater than 1 (310). In the method, a large number of DMRS ports are distributed to a plurality of PRBs, thereby reducing DMRS resource overheads on each PRB; thus, the multiplexing of a large number of DMRS ports is supported by means of relatively low resource overheads in a low multipath delay scenario, thereby improving the spectral efficiency of data transmission.

The invention discloses a distributed moving target passive positioning method and system based on deep sea multipath time delay combination, and belongs to the technical field of deep sea target detection and positioning. In order to solve the problems that Doppler compensation and multipath time delay combined processing cannot be considered at the same time and a special positioning scheme for a moving target is lacked in the prior art, two hydrophone nodes horizontally arranged near the seabed are utilized; relative Doppler and multipath delay inequality information of radiation signals of a moving target reaching two hydrophone nodes through different propagation paths are combined, a multipath propagation geometrical relationship positioning model of the moving target is constructed by combining a spatial position relationship between the moving target and the hydrophone nodes, and the model is optimized and solved, so that the positioning precision of the moving target is improved. And continuous high-precision positioning of a moving target track is realized. According to the method, the huge calculated amount of matching field processing is avoided, the positioning precision is high, simple, efficient and robust positioning is realized, and the engineering applicability is remarkably improved.

The invention discloses a device and a method for calibrating multipath delay parameters of a channel simulator, and relates to the technical field of wireless communication. Comprising an arbitrary waveform generator, an up-converter, a power divider, a channel simulator, a digital oscilloscope, a reference clock, a computer and a calibration reference plane. The method can avoid or improve the defects of the time domain pulse technology for calibrating the multipath delay parameter of the channel simulator, and provides a channel simulator multipath delay parameter calibration result with higher precision and larger bandwidth for the fields of broadband digital communication, 5G / 6G communication, radar signal processing, Internet of Things and the like.

This invention relates to the field of digital information transmission technology, specifically to a bandwidth-adaptive dynamic rate-limited data distribution system. The system includes a physical layer state acquisition front-end, a signal-to-noise ratio (SNR) trend prediction front-end, a cross-layer rate-limiting decision front-end, and a distribution execution front-end. The physical layer state acquisition front-end acquires the SNR sequence of the target distribution link; the SNR trend prediction front-end inputs the SNR sequence into a Kalman filter model and outputs a predicted value of the available bandwidth of the link, the state transition matrix parameters of which are dynamically determined by the multipath delay spread value of the current link; the cross-layer rate-limiting decision front-end compares the predicted value of the available bandwidth of the link with the current sliding window congestion window value of the transport layer and takes the smaller value as the dynamic rate-limiting threshold; the distribution execution front-end adjusts the data packet transmission interval of the transmission queue according to the dynamic rate-limiting threshold. This scheme reduces the transmission rate in advance based on the bandwidth prediction results before physical layer channel fading causes packet loss at the transport layer.

This application relates to a method for improving the accuracy of smart meter data completion, comprising: sampling multiple first meter data sequences to generate a meter sequence matrix and a mask matrix; performing a multipath delay embedding transformation on the meter sequence matrix and the mask matrix, dividing the obtained first tensor and mask tensor into multiple time-block first sub-tensors and mask sub-tensors, and decomposing each first sub-tensor into a first core sub-tensor and a factor matrix based on the mask sub-tensors; inputting the first target sequence generated based on the multiple first core sub-tensors and the corresponding position encoding results into a Transformer model to obtain multiple second core sub-tensors; performing inverse tensor decomposition based on the multiple second core sub-tensors and the factor matrix, performing an inverse multipath delay embedding transformation on the obtained second tensors, and adjusting parameters based on the numerical differences between the inversely transformed second meter data sequences and the first meter data sequences at the same missing position, thereby iteratively training the completion model. This method can improve the accuracy of data completion.

The application discloses a method for estimating a multipath delay section under dense false target jamming, which comprises the following steps: obtaining a first data vector X' and a second data vector Y' based on target echo signals received by a main antenna and an auxiliary antenna; obtaining a first distance unit vector U based on the first data vector X'; obtaining a second distance unit vector V based on the second data vector Y'; and obtaining the number of delay distance units of multipath jamming relative to direct jamming to be estimated based on the first distance unit vector U and the second distance unit vector V. The application is simple in implementation, convenient in processing, capable of avoiding a large number of multiplication operations, reducing the calculation amount, accelerating the operation speed and saving storage resources.

This invention discloses a multi-link fault-tolerant underwater communication adaptive switching method and system, relating to the field of underwater communication technology. The method includes: synchronously monitoring multiple available underwater communication links; collecting signal strength, signal-to-noise ratio, bit error rate, multipath delay spread, Doppler shift, and environmental noise level of each link at a set frequency to ensure consistent parameter acquisition time; and verifying parameter validity in real time during acquisition. The collected link parameters are then input into a multi-dimensional weighted fusion link quality assessment algorithm. The underwater communication adaptive switching method and system proposed in this invention ensures the timeliness and accuracy of link status feedback by synchronously monitoring multiple communication links and dynamically adjusting the parameter acquisition frequency. The use of a multi-dimensional weighted fusion algorithm to assess link quality makes the assessment results more comprehensive and accurate. The combination of a pre-set switching strategy library and an intelligent decision-making mechanism enhances adaptability and flexibility.

This invention relates to the field of power line carrier communication technology, and discloses a modulation method and modulation apparatus for power line carrier signals. The method is applied to a first communication device and includes: sending a probe frame signal to a second communication device, wherein the first and second communication devices are connected via a power line; receiving target multipath delay and target signal-to-noise ratio within a target frequency band from the second communication device, wherein the target frequency band is the frequency band of target data to be transmitted from the first communication device to the second communication device, and the frequency band of the payload data in the probe frame signal is the target frequency band; determining a target diversity copy mode for the target data based on the target multipath delay and target signal-to-noise ratio; and modulating the target data according to the modulation method in the target diversity copy mode. This invention can improve the accuracy of the determined diversity copy mode, thereby improving the performance and reliability of power line carrier communication.