71 results about "Multipath component" patented technology

The invention relates to a coal mine underground accurate positioning card reader direction identification method, and belongs to the technical field of wireless communication and accurate positioning. In order to solve the problems of low direction identification precision and direction jump caused by dense metal supports, complex electromagnetic environment and serious multipath reflection in a coal mine in the prior art, a multi-source information fusion solution is provided. The method comprises the following steps: initiating a time of flight (TOF) ranging request through an identification card; based on the TOF distance difference interval gradient distribution weight point number, RSSI intensity difference interval differential weighting and CIR characteristic value peak-to-average ratio delay spread multipath component number, analyzing signal quality weighting, and combining historical direction information to dynamically compensate the weight point number; and finally determining the direction of the identification card by comparing the total weight points of the left and right antennas. According to the method, the direction identification accuracy in a complex mine environment is remarkably improved, the multi-path interference and signal fluctuation influence are effectively inhibited, the system anti-attenuation capability is enhanced, and the continuous stability of moving target direction tracking is guaranteed.

A computer-implemented method for estimating a travelling speed of a wireless device in a wireless communications network, where the wireless device has transmitted a signal sequence to a network node via two or more signal paths. The method includes obtaining data indicative of a Doppler speed difference between respective multipath components of the signal sequence transmitted via the two or more signal paths; obtaining data indicative of direction of departure, DoD, (nUE,P1, nUE,P2) of the two or more signal paths at the wireless device; and estimating the travelling speed of the wireless device based on the data indicative of the Doppler speed difference and the data indicative of DoD.

The invention provides a communication method and a communication device. The method comprises: receiving configuration information of a plurality of reference signals, the configuration information of each of the plurality of reference signals comprising a measurement identifier and a time domain resource of a multipath component MPC, the time domain resources of the plurality of reference signals being the same; receiving the plurality of reference signals based on the configuration information of the plurality of reference signals; and sending indication information, the indication information indicating MPC information, and the MPC information being obtained by measurement based on the plurality of reference signals. By measuring the MPC information based on a plurality of simultaneously transmitted reference signals, the measurement accuracy of the MPC information can be improved. Furthermore, the MPC can reflect information of each path when the reference signal is transmitted through the wireless channel, so that some operations can be performed based on the MPC information, such as acquiring channel state information based on the MPC information. Compared with the feedback of the channel state information based on the codebook index and the quantization coefficient corresponding to the base of the codebook index, the feedback overhead and time delay can be reduced.

This invention provides an adaptive method and system for fast spatial spectrum estimation of multipath channels. The method includes: S1, using a linear uniform array as the receiving array, with the first element in the array as the reference element, deriving the broadband signal model and steering vector matrix received by the array; S2, constructing a fitness function, and using the dung beetle algorithm to search for the optimal fractional Fourier transform order of the received signal from the reference element; S3, performing the optimal fractional Fourier transform on the received signal of the array; S4, finding the coordinates (u) corresponding to the maximum value. p ,v p S5. Energy detection: Set a threshold for comparison. If the threshold is met, it indicates that the location of this point is a component of the multipath; otherwise, the algorithm ends. S6. Use the CLEAN algorithm to separate the multipath components. The center frequency of its narrowband filter is u. p S7. Use the MUSIC algorithm to estimate the incident angle of the multipath components; S8. Mask the strongest component among the current multipath components and return to repeat steps S4 to S7 until all components are estimated.

The invention provides a construction method of a virtual electromagnetic environment model and a test device. The construction method comprises the following steps: acquiring multi-dimensional test data of a mobile carrier in a target scene; taking a timestamp of the baseband signal data as a reference, performing synchronous fusion on the positioning data and the attitude data, and generating a synchronous data set; performing parameter estimation on the synchronous data set, and separating a relative channel parameter of the multipath component in a mobile carrier coordinate system; converting the relative channel parameters into absolute space parameters under a geographic coordinate system based on the instantaneous space state, and determining physical scattering source characteristics corresponding to the multipath component based on the relative channel parameters and the absolute space parameters; and generating a virtual electromagnetic environment model based on the absolute space parameters and the physical scattering source characteristics. In the mode, a structured virtual electromagnetic environment model containing absolute space attributes can be generated, and then high-fidelity digital reconstruction and reproduction of a complex dynamic electromagnetic environment in a real scene are realized.

The embodiment of the invention provides an RIS cascade channel model simplification method and device based on cluster deletion, and relates to the technical field of wireless communication. The method comprises the following steps: generating a first multipath of a first channel from a transmitting end to a reconfigurable smart surface (Tx-RIS), and generating a second multipath of a second channel from the RIS to a receiving end (RIS-Rx); performing power normalization and arrangement processing on the first multipath and the second multipath respectively; respectively carrying out convolution operation on the first multipath and the second multipath according to the sorting sequence, and determining reserved multipath combination information; calculating RIS electromagnetic response according to the multipath combination information; and generating a channel impulse response of Tx-RIS-Rx according to the RIS electromagnetic response. According to the scheme provided by the invention, the cluster or multipath component with low power ratio is removed from the Tx-RIS and RIS-Rx sub-channels, so that the modeling complexity is effectively reduced and the modeling efficiency is improved on the premise of ensuring the statistical channel characteristics.

This application belongs to the field of wireless communication technology and provides a general channel modeling method for communication of autonomous vehicles in underground spaces. The method includes: first, initializing model parameters and calculating path loss based on the scene; then, updating the orientation of the transceiver antennas using an attitude matrix and calculating their three-dimensional real-time positions; subsequently, selecting appropriate mechanisms to generate scattering clusters according to different underground scenarios such as pillar-type, tunnel-type, and cave-type, and updating their survival status based on the vehicle's motion state; next, generating and evolving specular multipath components and dense multipath components formed by specular reflection and diffuse scattering within each surviving scattering cluster; finally, combining line-of-sight and the two types of multipath components to calculate the time-varying channel impulse response and generate the channel matrix. This application can provide a more accurate and reliable general channel model foundation for the design, deployment, and performance evaluation of 6G underground communication systems, effectively supporting high-reliability communication assurance for underground autonomous vehicles.

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 present application provides a single-station collaborative node positioning method and system based on multipath spatiotemporal information, which relates to the field of anchorless collaborative positioning. The method includes: receiving known signals emitted by a target point through a stationary antenna and a rotating antenna to obtain the multipath signal of the target point; obtaining the angle information of the multipath signal based on a dual-antenna unambiguous collaborative node orientation detection method; obtaining a predicted target point based on the angle information; extracting time delay information based on the multipath signal and the known signal received by the stationary antenna; constructing a hyperbolic equation, combining the angle information and the time delay information, to determine the optimal target point, and complete the positioning of the collaborative node in a line-of-sight scenario. Based on multipath detection technology, the present invention combines the spatiotemporal information contained in the prior building layout and the multipath components to construct a single-station, anchorless collaborative node positioning method in a line-of-sight scenario to further reduce system complexity and construction costs.

The invention belongs to the field of TOA tracking, and discloses a 5G signal arrival time robust tracking method and system based on a challenge environment, and the method comprises the steps: carrying out the synchronization and pilot frequency information extraction of a 5G downlink broadcast channel (PBCH); cSI measurement and denoising are carried out; and estimating the time of arrival. According to the invention, based on a dual noise reduction mechanism of CSI, time domain smoothing and frequency domain processing are combined, so that the quality of low-signal-to-noise-ratio signals is remarkably improved. An SAGE algorithm and delay phase-locked loop collaborative architecture is introduced, accurate separation of multipath components and dynamic phase-locked optimization are achieved, complex environment interference is effectively inhibited, and TOA tracking precision is improved by more than 30%. According to the invention, a reliable solution is provided for high-precision positioning in a complex environment.

The invention discloses an ultra-wideband ranging and positioning method, system, device and medium for an underground environment, and the method comprises the steps: obtaining a multipath ranging signal and original ranging and positioning information, carrying out the channel estimation of the multipath ranging signal, and obtaining the channel impulse response of the multipath ranging signal; performing multi-path component identification processing according to the channel impulse response to obtain a direct component, multi-path components and first error correction data of each multi-path component; performing direction of arrival estimation on the multi-path components to obtain direction of arrival data of each multi-path component; inputting the channel impulse response and the direction of arrival data into a ranging error correction model for error prediction to obtain second error correction data; and correcting the original ranging and positioning information according to the first error correction data and the second error correction data to obtain a target ranging and positioning result. The method can effectively improve the precision of underground environment ranging and positioning. The invention relates to the technical field of ultra-wideband positioning.

A communication method, and an apparatus, the method comprising: receiving first information from a network device, the first information being used for indicating first multipath component information of a first port and second multipath component information of a second port, or being used for indicating correlation information between the first port and the second port; and receiving or sending a reference signal corresponding to the first port, wherein the reference signal, the first multipath component information and the second multipath component information are used for channel estimation, and the reference signal and the correlation information are used for channel estimation. By means of the method, channel estimation on the first port and the second port can be achieved on the basis of the first information and the reference signal corresponding to the first port, so that even in the absence of a reference signal corresponding to the second port, channel estimation can also be performed on the second port on the basis of the first information and the reference signal of the first port, thereby reducing the overhead of reference signals, and further ensuring the performance of data transmission of the first port and the second port.

This application provides a communication method and a communication apparatus. The method includes: transmitting a first type of multipath component (MPC) based on a first physical channel; and transmitting a second type of MPC based on a second physical channel, wherein the first type of MPC and the second type of MPC are used to jointly determine channel information. This not only enables the determination of channel information based on MPC, reducing the feedback overhead of channel information, but also, by designing the terminal device to transmit partial MPCs based on two physical channels respectively, compared to transmitting a complete MPC through a single physical channel, allows for the reporting of a greater number of MPCs and reduces the signaling overhead on a single channel.

The invention discloses a formation estimation method based on multipath channel negative feedback suppression and optimal time delay matching, which belongs to the technical field of underwater acoustic channel multipath component time delay extraction and underwater acoustic array formation estimation, and comprises the following steps: calculating a cross-correlation function of s (n) and yi (n), and extracting a maximum peak value and a corresponding time delay value; reconstructing hrbi (n) and yfbsi (n) of the multipath component, and iteratively extracting a time delay value to obtain tau fbs; performing optimal time delay matching to obtain # imgabs0 # calculation gamma m, n; traversing the matching field, calculating each position gamma m, n, constructing gamma and judging the optimal estimation position of the array element; by adopting the formation estimation method based on multipath channel negative feedback suppression and optimal time delay matching, the problem of formation estimation errors in a multipath environment is effectively solved.

The invention discloses a multipath clustering and tracking method for a dynamic wireless channel, which belongs to the technical field of wireless communication, and comprises the following steps: acquiring time delay, angle and power parameters of multipath components in each time snapshot; running an adaptive neighborhood robust mean shift clustering algorithm, and combining a neighborhood structure quality index to realize static division of a non-uniform density cluster; constructing a directional bounding box of the cluster in a three-dimensional feature space by utilizing principal component analysis, and accurately representing a geometric boundary of the cluster; executing cluster-level tracking based on a directional bounding box and Kalman filtering, and correcting a prediction state; a cluster-level joint similarity is defined based on the shape and density of the bounding box to determine the birth and death of the cluster, and the remaining multipath is re-clustered to identify a new cluster. According to the method, the problems of over-segmentation or under-segmentation and association fuzziness in the prior art are solved. According to the method, the variable density structure of the multipath cluster and the spatio-temporal evolution trajectory of the variable density structure can be adaptively represented, and the precision and robustness of channel modeling in a high-dynamic non-stationary scene are remarkably improved.

A communication method, apparatus and system. The method comprises: acquiring a multipath component (MPC) of the position where a first device is located; and on the basis of the MPC of the position where the first device is located, determining a first pilot pattern, wherein the first pilot pattern indicates Q first transmitting antenna ports, the Q first transmitting antenna ports being used for sending reference signals. In the solution, an MPC is used for determining a first pilot pattern, that is, reference signals are sent by means of Q first transmitting antenna ports, and thus computational complexity and channel measurement overheads can be reduced.

A communication method, and a related apparatus. In the method, first information acquired by a first communication apparatus is used for indicating multipath component information of a communication channel, and the first communication apparatus can determine second information on the basis of the first information and first channel information obtained by the measurement of a reference signal, the second information indicating multipath phase information. The first information and the second information may be used for determining second channel information of the communication channel. In other words, by means of the channel information (namely the first channel information) obtained by the measurement of the reference signal, the first communication apparatus can determine the multipath phase information, and the multipath phase information and the multipath component information can be used for determining other channel information (namely the second channel information) of the same communication channel. Therefore, channel information can be determined on the basis of the multipath phase information and the multipath component information, which reduces the overhead of the reference signal, thereby improving the resource utilization rate, and reducing the power consumption of terminal devices.

Exemplary embodiments provide a method of correcting a result of a ray tracing-based propagation channel simulation. The method of correcting propagation channel simulation data, includes: determining an intensity error value of a propagation channel simulation model for a propagation path associated with each object in a space for which a three-dimensional (3D) environment map is given and storing the intensity error value in a storage device; performing a propagation channel simulation for an arbitrary pair of a transmitter position and a receiver position in the space to obtain multipath components; determining an object having influenced propagations of the multipath components in the space; and correcting an intensity of at least one of the multipath components by applying the intensity error value associated with a determined object stored in the storage device.

In various embodiments, the present invention provides joint communication and sensing (JCAS) for in-band full duplex (IBFD) communication, wherein the transmitting device performs transmission of superimposed data and radar signals while simultaneously receiving a data signal. A self-interference cancellation process is additional implemented either in parallel with a conventional SI cancellation scheme or in series with a SI cancellation stage that handles multipath components.

The invention discloses a satellite-unmanned aerial vehicle channel dynamic modeling method, and belongs to the technical field of wireless communication. The method comprises the following steps: determining a time-varying geometrical relationship of a communication link based on input satellite orbit parameters, an unmanned aerial vehicle flight path and a carrier frequency, and calculating large-scale path loss; initializing parameters for generating a line-of-sight component and a non-line-of-sight multipath component based on a geometric random model framework; synchronously adjusting a plurality of primary structure parameters in the geometric random model framework based on real-time rainfall intensity during model operation; jointly judging and updating a scattering cluster set according to the survival probabilities of the time domain and the frequency domain; calculating a current channel impulse response on the basis of initializing parameters used for generating a line-of-sight component and a non-line-of-sight multipath component, the adjusted primary structure parameters and the updated scattering cluster set; according to the invention, in a dynamic link of a complex environment of satellite-unmanned aerial vehicle communication, the dynamic influence of environmental factors such as rainfall on a low-altitude multipath scattering structure can be reflected in real time.

The invention discloses an intelligent channel state information feedback method fusing a physical model, and the method comprises the steps: generating a CSI data set under multiple scenes, and obtaining a multipath parameter tag corresponding to the CSI data set; a hierarchical perception encoder is combined with the global perception capability of large kernel convolution and the local feature extraction capability of small kernel convolution so as to realize enhancement of a multipath component region and extraction of multipath parameter features; recovering each multipath parameter by adopting a heterogeneous architecture decoder; a guiding fine tuning type two-stage training strategy is adopted, a whole feedback network constructed by a codec is firstly guided to learn a mapping relation between CSI and channel multipath parameters, and then fine tuning is performed through a physical multipath channel model to optimize CSI reconstruction performance. According to the method, efficient compression from high-dimensional CSI to low-dimensional multipath parameters and high-quality reconstruction of the CSI can be realized, the feedback overhead is reduced, the CSI reconstruction precision is improved, and the calculation complexity of the model is reduced.

Disclosed in the present application are a communication method and apparatus. The method comprises: acquiring first information, which comprises a first reference signal density and / or a first feedback dimension; and sending first indication information, which is used for indicating first offset information of the first information, wherein the first offset information of the first information is related to a multipath component of the first device, and the first information and the first offset information of the first information are associated with a measurement configuration of a reference signal. The method can reduce overheads incurred by channel measurement and feedback.

Exemplary system, method and computer-accessible medium for selecting at least one location of (i) at least one receiver or transceiver or (ii) at least one transmitter or transceiver can be provided. For example, it is possible to facilitate a receipt, from the at least one transmitter or transceiver, of a plurality of signals by the receiver(s) or transceiver(s). Each of the signals has a multipath component. Then, it is possible to determine time of flight (ToF) information and angle of arrival (AoA) information of the multipath components present in the signals. Further, it is possible to determine one or more possible locations of (i) the receiver(s) or transceiver(s) or (ii) the transmitter(s) or transceiver(s) based on the ToF information, the AoA information, and a model of physical surroundings. The location(s) of (i) the receiver(s) or transceiver(s), or (ii) the transmitter(s) or transceiver(s) can be selected based on the one or more possible locations.

The invention provides a communication method and device. The method comprises the following steps: receiving first information from network equipment; the first information is used for indicating first multipath component information of the first port and second multipath component information of the second port, or is used for indicating correlation information between the first port and the second port; receiving or sending a reference signal corresponding to the first port; the reference signal, the first multipath component information and the second multipath component information are used for channel estimation; the reference signal and correlation information are used for channel estimation. Through the method, channel estimation can be performed on the first port and the second port through the first information and the reference signal corresponding to the first port, so that channel estimation can be performed on the second port according to the first information and the reference signal of the first port under the condition that no reference signal corresponding to the second port exists. Therefore, the overhead of the reference signal can be reduced, and the transmission performance of data transmitted by the first port and the second port is ensured.

The invention relates to the field of wireless communication, and provides an environment reconstruction method and system based on multi-antenna broadband non-line-of-sight communication multipath components. The method comprises the steps that according to the number of the multiple paths, the time delay of each multiple path and environment perception arrival angle parameters, under the condition that single-hop reflection / scattering is considered, time delay constraint and angle constraint are combined to obtain the obstacle position corresponding to each multiple path, the time delay range of the multiple paths is calculated according to the system bandwidth, and the arrival angle range is calculated according to the number of antenna array elements. The obstacle position corresponding to each multipath is expanded into an area; constructing an occupation grid map, discretizing an obstacle position area corresponding to each multipath, converting the discretized areas into grid positions, counting occupation marks, and determining idle mark counts; and marking the grids higher than the occupancy threshold value as an occupancy state, and marking the grids lower than the idle threshold value as an idle state, so as to construct a grid map for sensing the surrounding environment.

The application provides a high-speed moving complex scene wireless channel joint clustering and tracking method and system, and belongs to the wireless communication technical field, and comprises the following steps: for the multipath components of the previous several time points, an initial clustering model is constructed by using a clustering method based on a variational Bayesian Gaussian mixture model; according to the adjacent historical time points and the global clustering model, a distance-based decision method is used to perform joint clustering and tracking on the multipath components of the subsequent time points; and the joint clustering and tracking result is corrected. The application uses the multipath components of the previous several time points to construct an initial clustering model, realizes the identification of channel clusters of any shape, uses the connection between the multipath components of the adjacent several time points and the global, realizes the channel clustering while completing the multipath tracking, and the method only needs to be clustered once, effectively reduces the identification time and complexity, and the correction algorithm can effectively improve the identification precision and can complete the fast and accurate identification of the wireless channel clusters in the high-speed moving complex scene.

The application discloses a virtual anchor point solving method based on indoor multipath characteristics, which can be applied to a single station single antenna scene, and aims to utilize multipath component delay to realize position calculation of a virtual anchor point in an indoor environment, and gives a method for solving three-dimensional virtual anchor point coordinates from two-dimensional space from the perspective of space projection to cope with the demand of indoor multipath assisted positioning. Firstly, a virtual anchor point model of three-dimensional space is constructed; then, horizontal projection is carried out to solve a virtual anchor point of a two-dimensional horizontal plane; secondly, vertical projection is carried out to solve a virtual anchor point of a two-dimensional vertical plane; finally, similar virtual anchor points are excluded to obtain virtual anchor points corresponding to reflecting surfaces in a three-dimensional closed room. The application avoids extra parameter errors and high hardware costs caused by multi-parameter estimation, and is a multipath assisted mapping method with strong interpretability and simple implementation operation.

The application discloses a terahertz MIMO unmanned aerial vehicle non-stationary channel modeling method, a double sphere with the position of a transmitting end unmanned aerial vehicle and a receiving end unmanned aerial vehicle as the center is used to represent a near distance scatterer, a three-dimensional ellipsoid with the position of the transmitting end unmanned aerial vehicle and the receiving end unmanned aerial vehicle as the center is used to represent a far distance scatterer, according to the A2A channel characteristics, the SB component and the DB component generated by the LoS component, the near scatterer and the far scatterer are combined to describe the multipath component distribution around the transmitting end and the receiving end, a three-dimensional ellipsoid and double sphere composite geometric model of the unmanned aerial vehicle broadband non-stationary A2A channel is established, and based on the geometric random model, the expression of the time-varying time-frequency autocorrelation function and the Doppler power spectral density of the composite geometric model is derived, and the terahertz MIMO unmanned aerial vehicle non-stationary channel model is established. The model has universality and adaptability, and can be used for simulating various non-stationary unmanned aerial vehicle intercommunication scenes.

Provided in the present application are communication methods and a communication apparatus. A method comprises: receiving configuration information of a plurality of reference signals, wherein the configuration information of each of the plurality of reference signals comprises a measurement identifier of a multipath component (MPC) and a time-domain resource, and the plurality of reference signals have the same time-domain resource; on the basis of the configuration information of the plurality of reference signals, receiving the plurality of reference signals; and transmitting indication information, wherein the indication information indicates MPC information, and the MPC information is obtained by performing measurement on the basis of the plurality of reference signals. By measuring MPC information on the basis of a plurality of reference signals that are transmitted simultaneously, the measurement accuracy of the MPC information can be improved. In addition, an MPC may reflect the information of each path when a reference signal is transmitted by means of a radio channel. Therefore, some operations may be performed on the basis of the MPC information, for example, acquiring channel state information on the basis of the MPC information. Compared with the feedback of channel state information based on a codebook index and a quantization coefficient corresponding to the basis of the codebook index, the feedback overhead and delay can be reduced.

The invention discloses a dynamic physical layer key generation method and system based on satellite channel reciprocity, and relates to the technical field of wireless communication physical layer security, and the method comprises the steps: calculating a relative radial speed based on the motion state parameter of a communication node, and estimating the maximum Doppler frequency shift; calculating the change rate of channel impact response through real-time channel measurement so as to evaluate the channel randomness; binary decision is carried out based on a quantitative reciprocity evaluation model, and a physical layer key generation mode or a standby security mode is started for dynamic decision; when a physical layer key generation mode is decided to be started, performing anti-frequency-offset joint detection and synchronization, extracting a multi-dimensional channel feature containing a multipath component, performing adaptive quantization according to a signal-to-noise ratio, performing information negotiation based on hybrid coding of an LDPC code and an LT code to correct inconsistency, and performing privacy enhancement processing to generate a final session key. Through dynamic decision and a complete signal processing flow, high-reliability and high-efficiency physical layer key generation of the satellite is realized.