52 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.

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 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.

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 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.

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 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.

Certain aspects of the present disclosure provide methods, apparatus, and systems for predicting a location of a device in a spatial environment using a machine learning model. An example method generally includes measuring a plurality of signals received from a network entity at a device. A channel state information (CSI) measurement is generated from the measured plurality of signals. Generally, the CSI measurement includes a multipath component. Positions of one or more anchors in a spatial environment are identified based on a machine learning model trained to identify the positions of the one or more anchors based on the CSI measurement. A location of the device is estimated based on the identified positions of the one or more anchors.

The application discloses a kind of based on conformal MIMO radar waveform and array transceiver weighting joint multipath suppression method, belong to MIMO radar multi-channel waveform design and signal receiving processing field.The present application utilizes environmental information or prior information of multipath signal to carry out waveform and transceiver joint weighting multipath suppression, improve the identification accuracy of multipath component, and fully suppress the undesired multi-path signal, the present application can significantly improve target detection accuracy under indoor equal intensity multipath condition;The present application starts from the radar waveform design and array design angle, and the complexity is low, and real-time is good;The present application fully suppresses multipath echo, and improves output signal-to-noise ratio by multi-channel coherence superposition, and anti-interference performance is obviously improved.

Techniques for enhanced multipath component reporting in new radio are disclosed. In one aspect, a requesting entity (RE) can determine that a measuring entity (ME) can perform multipath phase measurements. The RE can send a first request to the ME to perform at least one multipath phase measurement. The RE can receive a first response to the first request from the ME, the first response including a result of the at least one multipath phase measurement. The RE can determine a location or sense an object based on the result of the at least one multipath phase measurement.

The invention relates to the technical field of multipath wireless communication, and particularly discloses a multipath wireless communication method based on AI model intelligent matching waveform, comprising the following steps: S1, a transmitting end repeatedly transmits a test signal to a receiving end, and the position of the receiving end is moved each time to obtain multipath information of different space points; the receiving end analyzes the signal, extracts the multipath structure parameters of each multipath component, and synthesizes the multipath structure parameters to obtain the channel diffusion characteristics of the channel; s2, pre-constructing a waveform primitive library with different time-frequency characteristics; intelligently selecting a group of basic waveforms from the library based on channel diffusion characteristics; calculating emission parameters of each basic waveform in combination with the multipath structure parameters; and S3, according to the calculated emission parameters, generating a plurality of waveform signals, superposing and synthesizing the waveform signals into a composite emission signal, and emitting the composite emission signal, thereby realizing adaptive matching and optimized transmission of the multipath channel.

The invention discloses a Turbo equalization method in a low earth orbit satellite OTFS system, and belongs to the technical field of wireless communication. The invention provides a Turbo equalization scheme based on an expectation-maximization-aided approximate orthogonal message passing (EMA-OAMP) algorithm, aiming at the problems of high detection complexity and poor detection performance of a traditional detector after a signal passes through a satellite-ground time-frequency doubly-selective channel, and provides a Turbo equalization scheme based on an expectation-maximization-aided approximate orthogonal message passing (EMA-OAMP) algorithm. The method comprises the following steps: firstly, converting a time-varying channel in a time delay-Doppler (DD) domain into a quasi-static sparse channel by using OTFS modulation; secondly, designing a detector based on an EMA-OAMP algorithm, efficiently identifying effective multipath components in a DD domain by using the OAMP algorithm, and introducing an EM module to dynamically obtain noise variance so as to improve signal detection performance; and finally, constructing a Turbo equalizer, cascading an EMA-OAMP detector and an LDPC decoder, and proposing an outer-layer dominant double-layer iteration termination strategy to realize collaborative optimization of symbol detection and decoding. According to the Turbo equalization scheme provided by the invention, the complexity is reduced, and the symbol detection performance is close to a maximum posterior probability algorithm.

A communication method and a communication apparatus. On the basis of the present application, a first apparatus can determine multipath components (MPCs) at the location of the first apparatus; a first pilot pattern is determined on the basis of the MPCs, wherein the first pilot pattern is used for indicating a first time-frequency point, and the first time-frequency point is used for sending a pilot signal; or feedback dimensions are determined on the basis of the MPCs, wherein the feedback dimensions comprise time-domain feedback dimensions and frequency-domain feedback dimensions, the time-domain feedback dimensions and the frequency-domain feedback dimensions are used for determining a second time-frequency point, and the second time-frequency point is used for feeding back channel information. The present application can achieve lower overheads of channel estimation, reduce the complexity of channel estimation and reduce feedback overhead.

Disclosed is a method for a location-based secure communication based on IRS. The controlled multipath components of the reflected signal are exploited by IRS, and secure communication is enabled through shuffling the phases of those components so they add constructively only at the intended receiver.