Provided are an information feedback method, terminal, base station, a storage medium, and an electronic device. The method includes: decomposing a channel state information (CSI) matrix H to obtain a matrix U.sub.d and a matrix V.sub.d, where U.sub.d is a matrix having d columns, and every two column vectors are mutually orthogonal; and V.sub.d is a matrix having d columns, and every two column vectors are mutually orthogonal; and feeding back amplitude and phase information of elements in U.sub.d including d left eigenvectors and/or amplitude and phase information of elements in V.sub.d including d right eigenvectors.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit, to a base station, a request for uplink reference signal resources for a beam training procedure. The UE may receive, in response to the transmitted request, control signaling identifying the uplink reference signal resources for the beam training procedure. The UE may transmit, using a set of multiple of beams, reference signals on the identified uplink reference signal resources and receive, in response to the transmitted reference signals, an indication of beam parameters for a beam at the UE. The UE may communicate with the base station using the beam at the UE according to the beam parameters.

An apparatus performs a discrete Fourier transform process on M×N received signal components included in a received signal, by a unit of N received signal components; and estimates an estimated signal containing M×N estimated signal components, which are estimated values of M×N transmission signal components, on the basis of the received signal on which the discrete Fourier transform process is performed. When the estimated signal xe is newly estimated, the apparatus performs an exclusion operation of excluding an estimated value xe.sup.(k) of the M transmission signal components that constitute a k-th transmission signal group from the estimated signal xe newly estimated, and updates the estimated value xe.sup.(k) based on an intermediate signal xt.sup.(k) obtained by the exclusion operation and the received signal, thereby re-estimating the estimated signal xe.

A radio frequency receiver comprises a set of antennas for receiving an RF signal over a communication channel represented by a channel matrix H.sub.d, a plurality of analog beamformer for generating plurality of analog beams, wherein each analog beam former is coupled to a subset of antennas comprising a fewer number antennas in the set of antennas, a mixer for combining the plurality of analog beams to provide a down converted signal, and a digital beam former for generating a plurality of digital beams, wherein a set of analog weights (F.sub.R) of the plurality of analog beamformer and a set of digital weights (F.sub.B) of the digital beamformer are selected such that effective beam formed by their product F.sub.B F.sub.R is orthogonal and spans the same space as columns of the channel matrix H.sub.d.

A user equipment (UE) in communication with a base station (BS) is disclosed that includes a receiver that receives Channel State Information (CSI)-Reference Signals (RSs) from the BS, a processor that generates CSI based on the CSI-RS and performs CSI omission, and a transmitter that transmits, to the BS, CSI reports including the CSI where one or more linear combination (LC) coefficients are omitted based on the CSI omission. Further, in the CSI omission, the processor prioritizes LC coefficients based on a predetermined priority rule and the processor also determines the omitted one or more LC coefficients based on the prioritized LC coefficients. In other aspects, a method for a UE and a wireless communication system are disclosed.

[Object] To make it possible to further increase a possibility of a success in a handover.

[Solution] A first apparatus of the present invention includes: a first communication processing unit configured to transmit reference signals using beamforming; and a second communication processing unit configured to receive a handover message from a source base station of a handover of a terminal apparatus. The handover message includes beam related information related to a beam. The first communication processing unit is configured to receive an access signal of the terminal apparatus based on the beam related 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.

In order to enable both a circuit scale of an apparatus that receives signals via antennas and a band of an interface between apparatuses to be small, a first communication apparatus according to the present invention includes: a reception processing unit configured to receive, from a second communication apparatus which receives signals via a plurality of antennas, channel related information related to a channel of signals received via the plurality of antennas; and a transmission processing unit configured to transmit, to the second communication apparatus, weight information related to receiving antenna weights by which the second communication apparatus multiplies signals received via the plurality of antennas, the weight information being generated based on the channel related information.

Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for a first user equipment (UE) transmitting, to a second UE, a sidelink message that includes an unprecoded reference signal. The second UE may measure the unprecoded reference signal and select a precoding matrix. The second UE may transmit a precoding matrix indication (PMI) to the first UE. The first UE may then transmit at least one sidelink message that is at least partially precoded in accordance with the PMI. In some cases, the first UE and the second UE may communicate according to a unprecoded transmission and precoded transmission pattern, where a new PMI is selected, using an unprecoded transmission, after a predefined number of precoded transmissions.

A system and corresponding method identify a remote device. The system comprises a transceiver and a classifier. The transceiver captures a channel state information (CSI) packet that is sent from a receiver device in response to receiving a calibration packet. The calibration packet is sent by the remote device via transmitter hardware. The classifier extracts a feature set from the CSI packet captured. The feature set is affected by characteristics of the transmitter hardware. The classifier produces a classified feature set by classifying the feature set extracted. The classifier further determines an identifier based on the classified feature set. The identifier corresponds to the remote device. The system enables the remote device to be fingerprinted via the identifier and without the need for software-defined radio (SDR) capabilities. As such, the system can be any low-cost Wi-Fi device, such as a laptop.