Methods, apparatus, and computer program products for a user equipment receiving CSI-RS and computing channel support information. Based on the CSI, the UE derives tap locations of channel support, depending on the observed channel and used subcarrier spacing. The deriving can additionally be done in relation to power class and window size. The UE apprises a base station of those tap locations of the channel support and also informs the base station of the strongest tap locations, which can be done in various ways comprising a bit mask. Methods, apparatus, and computer program products for a base station to send CSI-RS to a UE for computing CSI feedback. The CSI-RS resources can be for one or multiple transmit receive points. The base station receives back an indication of tap locations and a bit mask and builds information on tap locations by combining that received indication and bit mask.

In a first method, a wireless device estimates a delay profile of a channel impulse response, CIR, for a channel between a network node and the wireless device, compresses the delay profile using a compression function, and transmits the compressed delay profile. The compression function includes a first function and a quantizer. The first function is configured to receive input data and reduce a dimension of the input data. In a second method, a network node receives a compressed delay profile of CIR for a channel between a network node and a wireless device, decompresses the compressed delay profile using a decompression function, and estimates a position of the wireless device based on at least the decompressed delay profile. The decompression function includes a first function which is configured to receive input data and provide output data in a higher dimensional space than the input data.

Device and method can be provided for emulating a system which includes a wireless channel, a wireless transmitter, and a wireless receiver. For example, with an emulation processor, it is possible to receive baseband data, process the received baseband data, and transmit the processed baseband data. Further, with a controller, it is possible to receive configuration information pertaining to the wireless channel, the wireless transmitter, and the wireless receiver to be emulated; and configure the emulation processor according to the received configuration information.

According to one aspect, a network node configured to communicate with a wireless device is provided. The network node includes processing circuitry configured to: transmit a plurality of beamformed reference signals, each of the plurality of beamformed reference signals being associated with a respective sector of a cell; receive at least one uplink signal from the wireless device ; select one of the plurality of beamformed reference signals for the wireless device to monitor based at least in part on the received at least one uplink signal; and transmit an indication configured to cause the wireless device to monitor the selected one of the plurality of beamformed reference signals.

Provided are a reference signal resource configuration method and apparatus, a device, and a storage medium. The method includes: configuring a plurality of frequency domain units as a frequency domain unit set, where the frequency domain units are frequency domain resources of a preset frequency segment; configuring a reference signal resource pool corresponding to the frequency domain units, where the reference signal resource pool includes a plurality of reference signal resources, and at least part of the reference signal resources have an association relationship established according to a preset rule or have an association relationship established according to an indication of an association relationship among the frequency domain units; and configuring a preset resource attribute for multiple reference signal resources having an association relationship. The accuracy of estimating a channel feature can be improved by using the reference signal resources for estimating the channel feature.

An apparatus and method for providing a decision feedback equalizer are disclosed herein. In some embodiments, a method and apparatus for reduction of inter-symbol interference (ISI) caused by communication channel impairments is disclosed. In some embodiments, a decision feedback equalizer includes a plurality of delay latches connected in series, a slicer circuit configured to receive an input signal from a communication channel and delayed feedback signals from the plurality of delay latches and determine a logical state of the received input signal, wherein the slicer circuit further comprises a dynamic threshold voltage calibration circuit configured to regulate a current flow between output nodes of the slicer circuit and ground based on the received delayed feedback signal and impulse response coefficients of the communication channel.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may determine, based at least in part on two or more measurements on a channel taken at different points in time, that the channel is classified as static. The wireless communication device may perform at least one optimization based at least in part on determining that the channel is classified as static. For example, the at least one optimization may include modifying a channel state feedback procedure, reducing a periodicity associated with a measurement gap, modifying a filtering associated with measurements of the channel, reducing a threshold associated with beam switching, and/or refraining from performing at least one filtering at a radio frequency receiver of the wireless communication device. Numerous other aspects are described.

A transceiver configured to: determine a reference frequency offset relative to a second transceiver based on double sided ranging; correct first and second portions of a packet received from a respective first and second antenna; and determine an angle of arrival of the packet based on corrected first and second portions and the reference frequency offset.

[FIG. 10]

A wireless communication device and method therein for time synchronization in a wireless communication network are disclosed. The wireless communication device determines a first timing (tc) by performing a coarse time synchronization based on a synchronization signal received by the wireless communication device, wherein the received synchronization signal is sampled either in an original sampling rate or a reduced sampling rate. The wireless communication device determines a second timing (tf) by performing a fine time synchronization based on the determined first timing (tc) and the to received synchronization signal.

For example, an apparatus may include a sensor configured to detect changes in an environment of a wireless communication device based on wireless communication signals communicated by the wireless communication device. For example, the sensor may include an input to receive signal information of a plurality of Receive (Rx) signals received by an Rx antenna of the wireless communication device based on a loopback of a plurality of wireless transmit (Tx) signals transmitted by a Tx antenna of the wireless communication device; and a processor configured to determine a detection result based on a change in the signal information between an Rx signal and at least one previous Rx signal of the plurality of Rx signals, the detection result to indicate a detected change in the environment of the wireless communication device.