Patent ID: 8971426
Filing Date: 2015-03-03
Classification: H04B,H04W

Abstract:
1. A method for performing multiple antenna transmission from a user equipment to a base station, comprising: determining, by the user equipment for an uplink transmission, a criterion value of transmit power of each transmit antenna of a plurality of transmit antennas of the user equipment; grouping, by the user equipment, the plurality of transmit antennas into a first group of transmit antennas and a second group of transmit antennas according to the determined criterion value, wherein the first group of transmit antennas has higher transmit power than the second group of transmit antennas; and transmitting, by the user equipment, a signal to the base station via the first group of transmit antennas and the second group of transmit antennas, wherein the transmitting includes transmitting the signal to the base station using a precoding matrix configured to transmit a larger number of layer signals via the first group of transmit antennas as compared to the second group of transmit antennas, at least one layer signal being transmitted via each of the first group and the second group of transmit antennas, and wherein, in the precoding matrix, the number of elements having a value of 0 per column is the same, elements having a value of 0 are not present in the same row, and each column includes only one element having a value of 0.