Various aspects of the present disclosure generally relate to wireless communication. A wireless communication device may have an apparatus that aligns the non-linearity between transmit chains of the wireless communication device that are driven by the same digital port. The apparatus may adjust an amplification power out or an amplification saturated power to adjust a ratio between the amplification saturated power and the amplification power out for one or more transmit chains of the wireless communication device. The apparatus may adjust the ratios of transmit chains to align the ratios of the transmit chains for more consistent management of non-linear characteristics of the chain components. Numerous other aspects are described.

The present inventive concept relates to a method for designing an optimal analog precoder for improving frequency spectrum efficiency in a millimeter wave-based multi-user massive MIMO-based hybrid beamforming system and a hybrid beamforming system applying the same, and more specifically, to a method for designing an optimal analog precoder using an approximation technique and an iterative optimization algorithm, and a hybrid beamforming system to which the same is applied.

The present inventive concept relates to a method for designing an optimal analog precoder for improving frequency spectrum efficiency in a millimeter wave-based multi-user massive MIMO-based hybrid beamforming system and a hybrid beamforming system applying the same, and more specifically, to a method for designing an optimal analog precoder using an approximation technique and an iterative optimization algorithm, and a hybrid beamforming system to which the same is applied.

The present disclosure provides methods and devices for determining a codebook. The method for determining a codebook includes steps of: configuring for a UE a codebook determination parameter in accordance with an antenna array parameter adopted by a base station; and transmitting the codebook determination parameter to the UE to instruct the UE to determine the codebook in accordance with the codebook determination parameter.

A wireless communication device and a wireless communication method. The wireless communication device includes one or more processors. The processor is configured to estimate an equivalent channel from a base station to user equipment based on a user equipment specific reference signal from the base station, and generate, according to the estimated equivalent channel, a channel state indication used to be fed back to the base station.

Embodiments of the present invention provide a data transmission method, apparatus, and device, so as to improve efficiency in utilizing a time-frequency resource. The method includes: determining, by a transmit end device, a signature matrix S according to a quantity L of layers of a data stream and a quantity R of receive antennas used by a receive end device; determining, by the transmit end device, a precoding matrix P according to a channel matrix H and the signature matrix S, and performing precoding processing on the L-layer data stream according to the precoding matrix P; and sending, by the transmit end device to the receive end device, the L-layer data stream on which the precoding processing has been performed and information used to indicate the signature matrix S.

A central node may include a processor configured to empirically compute an approximation of power coefficients based on estimates of the channel coefficients such that a same one of the approximation of the power coefficient is assigned to each of a plurality of access terminals (ATs), and transmit components of a signal vector to associated access points (APs), the signal vector being based on at least the approximation of the power coefficient.

A terminal and a storage medium are provided. The storage medium stores a program for causing a processor to implement a method performed by the terminal, the method includes: sending, to a network device, first indication information which is used to indicate, to the network device, at least one of: number of first SRS resource sets required by the terminal, number of first SRS resources in a first SRS resource set, maximum layer number of uplink multi-antenna transmission of the terminal, whether uplink transmission channels of the terminal are coherent, and maximum number of PTRS ports supported for uplink transmission by the terminal, and is used by the network device to determine second indication information used to instruct the terminal to send an SRS signal; receiving second indication information sent by the network device; sending an SRS signal according to second indication information.

A terminal and a storage medium are provided. The storage medium stores a program for causing a processor to implement a method performed by the terminal, the method includes: sending, to a network device, first indication information which is used to indicate, to the network device, at least one of: number of first SRS resource sets required by the terminal, number of first SRS resources in a first SRS resource set, maximum layer number of uplink multi-antenna transmission of the terminal, whether uplink transmission channels of the terminal are coherent, and maximum number of PTRS ports supported for uplink transmission by the terminal, and is used by the network device to determine second indication information used to instruct the terminal to send an SRS signal; receiving second indication information sent by the network device; sending an SRS signal according to second indication information.

Wireless communication is established between a first station and a second station in a wireless communication system, the first station having a beamforming network configured to form a succession of beams using antenna weight vectors selected from a pre-determined plurality of antenna weight vectors. The orientations of the beams are arranged in a grid comprising a plurality of rows. The beams of each row are spaced in angular position such that at least one beam in a respective row is positioned mid-way between the positions of two beams on an adjacent row. A succession of beams is formed to send first messages using a selected first sub-set of the antenna weight vectors. If a first message in a first beam is received at the second station, a further succession of beams is formed using a second sub-set of the antenna weight vectors selected to form beams adjacent to the first beam.