In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device. The device applies N.sub.so sensing beam vectors to N.sub.so received signals at N.sub.ant antennas to obtain N.sub.so measurements, respectively, N.sub.so and N.sub.ant each being an integer greater than or equal to 1. The device determines a beam vector based on the N.sub.so measurements and the N.sub.so sensing beam vectors.

Provided are a method and apparatus for uplink transmission, a method and apparatus for receiving signal, a terminal device, a service node and a non-transitory computer-readable storage medium. The method for uplink transmission may include: performing beamforming on a Sounding Reference Signal (SRS) according to a target parameter, and transmitting the SRS beamformed, wherein the target parameter is determined according to downlink channel information; receiving precoding information; and transmitting an uplink transmission signal according to the target parameter and the precoding information.

Various embodiments herein provide techniques for reducing computational complexity in multiple input multiple output (MIMO, e.g., massive MIMO (mMIMO)) communications, such as efficient decomposition of a channel covariance matrix. Embodiments enable accurate mMIMO channel estimation with relatively low computational complexity compared with prior techniques. Additionally, embodiments may provide efficient beamforming and/or spatial compression. Other embodiments may be described and claimed.

Methods, systems, and devices for wireless communications are described. A communication device, which may be otherwise known as a user equipment (UE), may determine a capability relating to an antenna configuration associated with channel state information reporting. The UE may transmit a message including an indication of the capability, and receive a channel state information reference signal using the antenna configuration. The UE may transmit, based on the channel state information reference signal, a channel state information report in accordance with the antenna configuration associated with the channel state information reporting.

Systems and methods are disclosed herein for providing full orthogonality between simultaneously used beams, e.g., in a Multi-User Multiple-Input-Multiple-Output (MU-MIMO) radio system. In some embodiments, a radio system comprises an antenna system and a processing unit. The processing unit is adapted to determine an initial set of null locations for a particular beam based on an initial set of beam weighting factors for the particular beam, and change one or more of the initial null locations based on one or more other beams to be used simultaneously with the particular beam, thereby providing a new set of null locations for the particular beam. The processing unit is further adapted to compute a new set of beam weighting factors for the particular beam based on the new set of null locations, and utilize the new set of beam weighting factors to transmit or receive on the particular beam.

This application discloses a method for sending a physical uplink shared channel and an apparatus and relates to the communication field, to resolve a problem of how to transmit uplink data to different TRPs by using different precoding matrices. A network device sends indication information to a terminal device, where the indication information is used to indicate first information and second information. The first information is used to indicate first precoding information corresponding to a first nominal PUSCH repetition. The second information is used to indicate second precoding information corresponding to a second nominal PUSCH repetition. The terminal device sends N PUSCHs based on precoding information indicated by the indication information. The precoding information corresponding to the N PUSCHs includes at least one of the first precoding information and the second precoding information.

The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.

Disclosed in the present application are a data transmission method and apparatus and a computer storage medium, to map a data layer to a DMRS port used in transmission according to a preset DMRS port ordering rule, and perform transmission. The data transmission method provided in an embodiment of the present application comprises: determining a preset demodulation reference signal (DMRS) port ordering rule; and mapping a data layer to a DMRS port used in transmission according to the preset DMRS port ordering rule, and sending the data layer to a terminal.

The present invention relates to a method for transmitting and receiving channel state information (CSI) and a device for same. Specifically, the method comprises the steps of: receiving setting information including information about a codebook; receiving a reference signal; measuring CSI on the basis of the reference signal; and transmitting the CSI, wherein the CSI is calculated on the basis of the codebook, which is formed by linear combination on the basis of multiple matrices, a first matrix of the codebook includes a plurality of column vectors set differently for each polarization of antenna ports, and the CSI includes precoding matrix indicators (PMIs) corresponding to indexes of the codebook.

A signal sending method and a related apparatus are disclosed. In the signal sending method, an access network device obtains a channel information sample, determines M′ frequency domain units in M frequency domain units in an (x+T).sup.th time unit based on the channel information sample, and sends one or more measurement pilots to a terminal in the M′ frequency domain units. The one or more measurement pilots are used to measure CSI, and the channel information sample includes channel information in an x.sup.th time unit to an (x+T−1).sup.th time unit, where M′<M. In the method, the access network device may determine the M′ frequency domain units in the M frequency domain units in the (x+T).sup.th time unit to send the one or more measurement pilots, to implement frequency-domain dimension reduction of the one or more measurement pilots.