METHOD AND APPARATUS FOR EFFICIENT FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS

摘要

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for efficient feedback in a wireless communication system that supports multiple antennas. According to one embodiment of the present invention, a method for transmitting channel state information for a downlink transmission via an uplink in a wireless communication system comprises the following steps: transmitting a joint-coded rank indicator (RI) and a wideband first precoding matrix indicator (PMI) in a first subframe; and transmitting a wideband channel quality indicator (CQI) and a wideband second PMI in a second subframe. The precoding matrix preferred by a terminal is indicated by a combination of the first PMI and the second PMI, and if the RI is rank 1 or rank 2, the first PMI may have a value which represents one of subsets constituted by eight indices from among a total of sixteen indices of a precoding codebook for a first PMI.