A method for transmitting an uplink signal based on a codebook by a UE in a wireless communication system includes: receiving, from a base station, downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal; determining the precoding matrix applied to the transmission of the uplink signal from a codebook subset related to the transmission of the uplink signal based on the DCI; and transmitting, to the base station, the uplink signal based on the determined precoding matrix, I which based on that a difference between phase values applied to antenna ports for the transmission of the uplink signal is maintained in some antenna ports among all antenna port pairs, the codebook subset includes at least one specific precoding matrix applying different phase values to antenna ports included in all or some of the some antenna ports.

The present disclosure provides an omnidirectional beamforming method. In the omnidirectional beamforming method, a space-time block coding is performed on a data stream to be sent to obtain the coded data stream. Omnidirectional beamforming matrices corresponding to a uniform rectangular antenna array are constructed. The beamforming is performed on the coded data stream through the omnidirectional beamforming matrices, to generate a signal to be sent of the uniform rectangular antenna array.

The method comprises receiving periodic CSI feedback configuration information including a periodicity value and an offset value corresponding to a first CSI report, and at least one periodicity value and at least one offset value corresponding to a second CSI report, measuring a first CSI reference signal (CSI-RS) and a second CSI-RS configured for a periodic CSI reporting based on at least two different enhanced MIMO types (eMIMO-Types), generating the first CSI report and the second CSI report for the first eMIMO-Type and the second eMIMO-Type, respectively, determining a periodic reporting interval for each of the first CSI report and the second CSI report, and reporting the first and second CSI reports based on the determined periodic reporting intervals using a physical uplink control channel (PUCCH) format 2 or a PUCCH format 3 or a combination of the PUCCH format 2 and the PUCCH format 3.

A system includes a direct radiating array antenna and one or more processors. The antenna includes an array of elements configured to radiate radiofrequency (RF) energy to form a beam having multiple frequency channels. The one or more processors are configured to generate an excitation plan for powering the elements to form the beam. The excitation plan assigns multiple corresponding beamforming coefficients to each element in a group of the elements. Each beamforming coefficient designates power allocated to the assigned element for radiating RF energy at an associated frequency channel. The excitation plan provides a substantially uniform power distribution among the elements in the group, and at least some of the elements in the group have different allocations of power among the multiple frequency channels of the beam than other elements in the group.

A system and method for uplink multi-antenna power control in a communications system are provided. A method for user equipment operations includes determining a transmit power level for transmit antennas of the user equipment having at least two transmit antennas, and setting a power amplifier output level for each of the at least two transmit antennas in accordance with a respective transmit power level.

The method comprises receiving periodic CSI feedback configuration information including a periodicity value and an offset value corresponding to a first CSI report, and at least one periodicity value and at least one offset value corresponding to a second CSI report, measuring a first CSI reference signal (CSI-RS) and a second CSI-RS configured for a periodic CSI reporting based on at least two different enhanced MIMO types (eMIMO-Types), generating the first CSI report and the second CSI report for the first eMIMO-Type and the second eMIMO-Type, respectively, determining a periodic reporting interval for each of the first CSI report and the second CSI report, and reporting the first and second CSI reports based on the determined periodic reporting intervals using a physical uplink control channel (PUCCH) format 2 or a PUCCH format 3 or a combination of the PUCCH format 2 and the PUCCH format 3.

A method for transmitting an uplink signal based on a codebook by a UE in a wireless communication system includes: receiving, from a base station, downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal; determining the precoding matrix applied to the transmission of the uplink signal from a codebook subset related to the transmission of the uplink signal based on the DCI; and transmitting, to the base station, the uplink signal based on the determined precoding matrix, I which based on that a difference between phase values applied to antenna ports for the transmission of the uplink signal is maintained in some antenna ports among all antenna port pairs, the codebook subset includes at least one specific precoding matrix applying different phase values to antenna ports included in all or some of the some antenna ports.

Embodiments of the disclosure relate to selective multichannel amplification in a distributed communication system. In this regard, a remote antenna unit (RAU) in the distributed communication system receives downlink digital signals associated with downlink channels having respective downlink channel bandwidths. The RAU digitally scales the downlink digital signals based on respective digital scaling factors to generate scaled downlink digital signals having a substantially equal channel power density in the downlink channels. By digitally scaling the downlink digital signals to provide the substantially equal channel power density in the downlink channels, it is possible to provide substantially uniform radio frequency (RF) coverage range across the downlink channels, thus helping to improve overall RF coverage and user experience in a coverage area of the distributed communication system.

A system and method for uplink multi-antenna power control in a communications system are provided. A method for user equipment operations includes determining a transmit power level for transmit antennas of the user equipment having at least two transmit antennas, and setting a power amplifier output level for each of the at least two transmit antennas in accordance with a respective transmit power level.

In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.