A terminal includes a receiving unit configured to receive information relating to an arrangement of a tracking reference signal and a plurality of tracking reference signals based on the information relating to the arrangement of the tracking reference signal, and a controller configured to perform a Doppler estimation using two of the plurality of tracking reference signals, wherein an interval between the two of the plurality of tracking reference signals in a time domain is variable.

Apparatus, methods, and computer-readable media for facilitating L1 UE-side filtering for mmW frequencies are disclosed herein. An example method for wireless communication at a user equipment includes configuring a filter coefficient for a serving beam. The example method also includes applying the filter coefficient to the serving beam to determine an updated filtered measurement result. The example method also includes reporting the updated filtered measurement result to a base station.

The apparatus may be a UE. The UE may be configured to measure, over a time interval, a plurality of instances of a signal received from a serving device (e.g., a base station or serving UE). The UE may further be configured to adjust, based on at least two previously measured instances of the signal, a sampling rate associated with the signal received from the serving device. The UE may further be configured to maintain a particular number (e.g., 2-10) of previously measured instances of the signal, where adjusting the sampling rate is based on the maintained particular number of previously measured instances. The particular number of previously measured instances of the signal may be used to calculate a gradient of the measurements to identify a sampling rate associated with the calculated gradient.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit a request, for an uplink transmission or a downlink transmission, for data aided phase tracking reference signals (PT-RSs); and communicate the uplink transmission or the downlink transmission based at least in part on the request. Numerous other aspects are provided.

Apparatus, methods, and computer-readable media for facilitating phase jump estimation for SL DMRS bundling are disclosed herein. An example method includes receiving, from another device, first information at a first symbol of a first slot, the first slot including at least the first symbol and a first reference signal. The example method also includes receiving second information at a second symbol of a second slot, the second slot including at least the second symbol and a second reference signal, the first information and the second information being repetitions. The example method also includes generating a first reference signal copy based at least on the second reference signal and a phase jump between the first slot and the second slot. Additionally, the example method includes performing channel estimation across the first slot and the second slot based on an aggregation of the first reference signal and the first reference signal copy.

A method includes receiving, by a first user device in a wireless network, an indication of availability of a pre-trained model that estimates a channel between a second user device and a network node; receiving, by the first user device, information relating to the pre-trained model; determining, by the first user device, channel estimation information based at least on the information relating to the pre-trained model; and performing at least one of the following: transmitting, by the first user device, a report to the network node including the channel estimation information; or receiving data, by the first user device from the network node, based on the channel estimation information.

Aspects of the subject disclosure may include, for example, obtaining, over an uplink (UL) using an aggregation of modular antenna arrays, a modulated signal that includes feedback transmitted by a user equipment (UE), wherein the aggregation of modular antenna arrays comprises multiple groups of antenna elements, after the obtaining the modulated signal, performing a demodulation of the modulated signal, determining demodulator constellation errors from the demodulation of the modulated signal, performing an error gradient weight adaptation responsive to the determining the demodulator constellation errors to derive revised weights for various antenna elements of the multiple groups of antenna elements, and applying the revised weights to the various antenna elements of the multiple groups of antenna elements to adjust signals received over the UL. Other embodiments are disclosed.

Doppler effects are compensated for in received wireless communication signals. In a receiver a first signal is received, that was transmitted by a transmitter at a first frequency f.sub.1 and that was received at a doppler-shifted first frequency f.sub.1′ and a second signal, that was transmitted by said transmitter at a second frequency f.sub.2 and that was received at a doppler-shifted second frequency f.sub.2′ is also received. A frequency difference f.sub.S between the first frequency f.sub.1 and the second frequency f.sub.2 has a predetermined value. Based on the doppler-shifted first frequency f.sub.1′, the doppler-shifted second frequency f.sub.2′ and the frequency difference f.sub.S, the first frequency f.sub.1 is determined for pre-compensating Doppler effects in the received first signal.

Phase tracking when joint transmission is performed by a plurality of wireless base stations is easily implemented. The wireless base stations perform coordinated transmission to transmit to the wireless terminal in coordination with a coordinated wireless base station. The wireless base station includes a wireless control unit and a communication unit. The wireless control unit makes an agreement on a reference signal with the coordinated wireless base station that performs coordinated transmission, and generates an agreed reference signal. The communication unit transmits a signal including the reference signal to the wireless terminal in coordination with the coordinated wireless base station. The wireless terminal estimates a frequency error among the wireless base stations that perform coordinated transmission on the basis of the received reference signal.

Facilitating sparsity adaptive feedback in the delay doppler domain in advanced networks (e.g., 4G, 5G, 6G, and beyond) is provided herein. Operations of a method can comprise determining, by a first device comprising a processor, a channel covariance matrix in a time-frequency domain based on a channel estimation associated with reference signals received from a second device. The method also can comprise decomposing, by the first device, the channel covariance matrix into a group of component matrices. Further, the method can comprise transforming, by the first device, respective matrices of the group of component matrices into respective covariance matrices in a delay doppler domain. The method also can comprise determining, by the first device, channel state information feedback in the delay doppler domain.