A method, apparatus and computer readable medium are provided for determining position information of a receiver device. The method includes determining a plurality of beams and combining received multipath signals from the plurality of the beams. The received multipath signals are generated by a transmitter device. The method also includes determining, based at least in part on the combined received multipath signals, a line of sight signal and determining, based at least in part on the line of sight signal, position information of a receiver device.

Systems (100) and methods (200) for impulsive noise detection and mitigation are described. In particular, the system (100) includes a transmitter (102), a communication channel (106), and a receiver (104). The transmitter (102) is configured to encode an input signal, modulate the encoded signal for transmission through the communication channel (106), and transform the modulated signal into a time-domain signal. The communication channel (106) is configured to transmit the time-domain signal and a control signal from the transmitter (102) to a receiver (104). The receiver (104) is configured to transform the time-domain signal into a frequency-domain signal, detect a position of impulsive noise in the frequency-domain signal based at least on identifying a position of null subcarriers in the frequency-domain signal via the control signal, and initiate the suppression of the impulsive noise from the frequency-domain signal.

A low complexity clock drift estimation scheme for UWB-MMS ranging is proposed, assuming sampling frequency offset (SFO) and carrier frequency offset (CFO) are driven from the same clock source. SFO is first estimated with the multiple CIR fragments, and it is used to compensate the CFO for the CIR fragments. Then a fine CFO estimate is obtained from the compensated CIRs. Combining the coarse SFO and fine CFO estimate to resample and phase rotate the original CIRs can significantly improve the performance for CIR combining, thus, improve the performance for ranging.

An operating method of a user equipment (UE) includes receiving channel state information-reference signal (CSI-RS) configuration information from a base station including time and frequency location information of a first CSI-RS, the first CSI-RS corresponding to a first density value of 0.5, 1 or 3, determining whether to request a second CSI-RS having a second density value based on a channel characteristic, the second density value being different from the first density value, and the channel characteristic corresponding to a channel between the UE and the base station, transmitting a request message to the base station in response to determining to request the second CSI-RS, receiving the second CSI-RS from the base station based on the CSI-RS configuration information, the second CSI-RS being based on the request message, estimating the channel based on the second CSI-RS, and transmitting a CSI-RS report to the base station based on the channel estimate.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a responding device may receive a signal from an initiating device. The responding device may estimate, from the signal, a channel impulse response (CIR) that represents signal reflections from one or more objects as multiple taps. The responding device may select one or more taps, from the multiple taps, that are within a first time window that starts at a first offset from a reference point and that has a first specified time duration. The responding device may transmit, to the initiating device, a CIR report that indicates the one or more taps. Numerous other aspects are described.

The present invention refers to a method and system for joint communication and reconstruction of the micro-doppler time-frequency spectrum from sparse channel measurements.

Proposed are ultra-wideband transmitter and receiver. The ultra-wideband round-trip wireless transceiver includes a master module comprising a first transmitter and a first receiver for ultra-wideband round-trip data communication, and a slave module comprising a second receiver and a second transmitter for the round-trip data communication, wherein the master module further includes a range finder module for two-way ranging that counts time simultaneously with transmission of an output signal of the first transmitter, and calculates a distance by receiving a signal output through the second transmitter at the first receiver by using a trigger according to the output signal of the first transmitter at the second receiver of the slave module.

A method performed by a network node for handling channel feature estimates associated with a radio channel between a User Equipment, UE, and the network node in a wireless communications network is provided. The network node obtains a channel feature estimates associated to the radio channel estimated at a first point in time. Data representing the channel feature estimates has a first size. The network node compresses the channel feature estimates at the first point in time by replacing them with updated channel feature estimates that at the subsequent point in time fulfils a respective threshold condition. The data representing the updated channel feature estimates has a second size. The second size is smaller than the first size. The network node then adjusts parameters for a transmission at the radio channel based on the updated channel feature estimates.

Systems, methods, and devices for combining narrowband and ultra-wideband (UWB) communication to provide enhanced ranging are disclosed. In an exemplary aspect, a method of ranging is disclosed. In some embodiments, the method includes generating a coarse distance estimate using narrowband communications. The method may further include generating a channel impulse response (CIR) estimate using UWB communications; and estimating a distance between a first device and a second device based on the coarse distance estimate and the CIR estimate.

This application provides a sensing method and an apparatus, to implement sensing through frequency stitching. A second device sends a first message, and a first device receives the first message. The first message includes first information indicating a feedback policy for a sensing result corresponding to a plurality of frequency bands, and the plurality of frequency bands are used for frequency stitching. The first device sends a second message to the second device based on the first message. The second message includes a sensing result corresponding to at least one of the plurality of frequency bands. In this solution, reliability of implementing sensing through frequency stitching can be improved, and sensing performance of a UWB system can be improved.