12 results about "Power delay profile" patented technology

This invention discloses a channel estimation device based on power delay spectrum estimation. First, resource particles for pilots are extracted from the frequency domain resource grid for different physical channels, and LS channel estimation is performed with the generated local pilots. Then, according to different physical channels, two strategies are employed: segmented calculation and inverted edge data, transforming the data into a power of 2 number of points. A radix-2 IFFT fast algorithm is used to convert the channel estimate at the pilot to the delay domain. A power delay spectrum window is calculated in the delay domain, and noise reduction processing is applied to the channel estimate at the pilot in the delay domain. Finally, a radix-2 FFT fast algorithm is used to interpolate and obtain the channel estimate in the full frequency domain. The data is then integrated and output according to different physical channels. This invention balances performance and implementation complexity, handles delay and hardware resources, improves the system's versatility, compatibility, portability, and scalability, and effectively solves the channel estimation problem based on FPGA or ASIC implementations.

An operation method of user equipment configured to perform wireless communication with a base station includes receiving a positioning reference signal (PRS) from the base station, calculating a power delay profile (PDP) based on the PRS, detecting at least one path by performing a path search operation based on the PDP, the at least one path including a first path, the path search operation including detecting a first PDP index as the first path, the first PDP index having a value corresponding to a first power of a first threshold PDP or more, and the first threshold PDP being based on a peak power of the PDP, and measuring a reference signal time difference (RSTD) based on the first path.

One aspect of this disclosure relates to a terminal comprising: a receiving unit that receives setting information related to the measurement of at least one of a channel impulse response (CIR), a power delay profile (PDP), and a delay profile (DP), i.e., setting information including at least one parameter such as an additional path for AI-based positioning and a relative time difference; and a control unit that applies AI-based positioning model inference and performs measurements based on the setting information. According to one aspect of this disclosure, appropriate reporting related to AI / ML-based positioning can be performed.

A radio-determined environment sensing system includes: (a) a first transmitter configured to transmit a pilot radio signal; (b) at least one receiver configured to receive a mixture of signals including the pilot signal and reflections thereof; and (c) at least one control unit configured to receive the mixture of signals from the UE modules and process them to generate channel estimates and therefrom to extract the taps contained. The first transmitter and the at least one receiver are static over a certain time period. The control unit is configured to operate a processing procedure to generate at least one power delay profile (PDP) tap from the channel estimate, and evaluate changes in the environment from information contained in a calculated measurement vector zk.

A method (1000) for calibration of an antenna array is provided. The method comprises deriving (1100) at least one Wiener filter coefficient for the antenna array based on at least one power delay profile characteristic related to the antenna array and at least one signal-to-noise ratio related to the antenna array. The method further comprises estimating (1200) at least one transmitter parameter and / or at least one receiver parameter using the at least one Wiener filter coefficient for the antenna array, and calibrating (1300) the antenna array based on the at least one transmitter parameter and / or the at least one receiver parameter.

The invention discloses a power delay spectrum estimation method based on frequency domain noise whitening, which is applied to a power line communication system. According to the method, in order to solve the problems that power line channel frequency selective noise is high and a special silence period is lacked, the noise power spectral density is directly estimated from a received signal through frequency domain smoothing processing, a frequency domain whitening filter is designed according to the noise power spectral density to conduct whitening and normalization processing on channel response, the frequency selective noise is converted into flat noise, and the frequency selective noise is obtained. And a power delay spectrum with a substantially reduced noise floor is generated. On the basis, multipath components are accurately recognized through peak detection and parameter estimation, signals are reconstructed to separate and calculate signal and noise power, and finally high-precision signal-to-noise ratio estimation is achieved. According to the method, a silent period is not needed, frequency selective noise can be effectively resisted, and the accuracy of multipath parameter and signal-to-noise ratio estimation is remarkably improved.

The application discloses a wireless communication system scene adaptive multipath time delay alignment method and device, the method uses SISO channel detection system to measure channel data, adopts a rectangular or RRC shaping filter to generate a CAZAC oversampling sequence as a template function, calculates the cross-correlation matrix of the IQ signal and the template function, calculates the noise threshold based on the median power and false alarm rate, executes dynamic threshold noise filtering, generates the cross-correlation matrix after noise reduction, and completes the preliminary estimation of the time domain impulse response; the SAGE algorithm is used to extract the multipath time delay and complex gain from the cross-correlation matrix; the channel impulse response is drawn to draw a power delay profile (PDP); and the PDP is aligned in combination with the geographic position information of the transceiver during actual measurement. The application solves the defects of traditional alignment in a bad scene, improves the statistical modeling accuracy, and can effectively align the multipath time delay through experiment verification, thereby providing reliable support for channel modeling.

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a configuration for receiving or computing interference parameters based, at least in part, on one or more estimated power delay profiles (PDPs), one or more precoding rules, and one or more kernels, the one or more estimated PDPs being associated with one or more communication channels. The UE may receive a configuration for applying the interference parameter to transmissions with power close to a compression point of a power amplifier to reduce transmit non-linearity. Numerous other aspects are described.

A method of sensing occupancy of a vehicle using ultra-wide band (UWB) communication includes transmitting and receiving a UWB signal within the vehicle, obtaining channel impulse response (CIR) data corresponding to the UWB signal as received within the vehicle, calculating power delay profile (PDP) results for the CIR data, determining, based on the calculated PDP results, the occupancy of the vehicle, and at least one of generating, storing, and transmitting occupancy sensing results based on the determined occupancy of the vehicle. The occupancy sensing results include data that indicates at least one of a presence of occupants within the vehicle, a number of occupants within the vehicle, and locations of occupants within the vehicle.

Disclosed are techniques for wireless communication. In an aspect, a receiver device receives, from a network entity, a request to report a power delay profile (PDP) similarity metric for a first positioning frequency layer on a first component carrier and a second positioning frequency layer on a second component carrier; determines a first PDP for a first reference signal received on the first positioning frequency layer and a second PDP for a second reference signal received on the second positioning frequency layer; determines the PDP similarity metric based on the first PDP and the second PDP; and transmits, to the network entity, the PDP similarity metric.

Methods and apparatuses for noise removal are provided. A noise removal method may determine multiple channel impulse responses (CIRs) and multiple power delay profiles (PDPs) corresponding to the CIRs collected at multiple spatial-separated positions. Initially, the noise removal method may apply a dynamic noise threshold based on a false-alarm probability to generate an initial denoised signal. Thereafter, the noise removal method may apply a delay window to the initial denoised signal to generate an intermediate denoised signal. Finally, the noise removal method may perform a persistence check on the intermediate denoised signal to generate the final denoised signals, assuming a multiple component present in multiple CIRs when the transmitter or receiver moves in a small distance which is not true for the random noise. The false alarm probability, the delay window, and / or the persistence check may be dynamically optimized for a specific environment.

A communication device includes a transceiver circuit and a controller circuit. The transceiver circuit is configured to receive packets from electronic devices. The controller circuit is configured to: parse the packets to obtain power delay profile of each of the electronic devices; set a guard interval of each of the electronic devices according to the power delay profile; divide the electronic devices into a first group of devices and a second group of devices; and sending, through the transceiver circuit, a trigger frame to at least one group of devices in the first or the second group of devices, such that the at least one group of devices upload data to the transceiver circuit.