Method of receiving or transmitting downlink signal in wireless communication system and device for performing the method

摘要

A method of receiving a downlink signal by a terminal in a wireless communication system according to an embodiment of the present invention includes: transmitting, to a serving base station, an antenna selection index for selecting M of N antennas (where N>M and both N and M are positive integers) in a specific base station and a pre-coding matrix indicator PMI suitable for the M antennas; and receiving, from the specific base station, the downlink signal on which pre-coding is performed by using a pre-coding determined based on the antenna selection index and the pre-coding matrix indicator, wherein the antenna selection index may indicate any one of the antenna selection vectors that belong to an antenna selection codebook consisting of all the antenna selection vectors or a subset of all the antenna selection vectors for selecting at least one of the N antennas in the specific base station.

主权项

1. A method for receiving a downlink signal by a user equipment (UE) in a wireless communication system, the method comprising:
transmitting an antenna selection index for selecting M antennas among N antennas of a specific base station (BS), where N>M and both N and M are positive integers, and a precoding matrix indicator (PMI) appropriate for the M antennas to a serving BS; and receiving downlink signal which is precoded using a precoding matrix determined based on the antenna selection index and the PMI, from the specific BS, wherein the antenna selection index indicates one of all antenna selection vectors for selecting at least one antenna among the N antennas of the specific BS or an antenna selection vector included in an antenna selection codebook comprised of subsets of the all antenna selection vectors, wherein, when M is a divisor of N, a precoding matrix (PMnew ) is determined according to PMnew =A1 ×PM1, and where A1 is a matrix obtained by removing columns of zero (0 ) vectors from diag(a), diag(a) is a diagonal matrix having elements of antenna selection vector (a) indicated by the antenna selection index as diagonal elements, and PM1 is a precoding matrix indicated by the PMI appropriate for the M antennas.