Patent ID: 8576937
Filing Date: 2013-11-05
Classification: H04B

Abstract:
1. A method for transmitting feedback information from a receiver to a transmitter in a Multiple Input Multiple Output (MIMO)-based wireless communication system, the method comprising: estimating a state of a channel between the receiver and the transmitter, and selecting two precoding matrixes which are most preferred in the estimated channel state; and feeding back identification information for identifying the two selected precoding matrixes, to the transmitter, wherein the identification information includes one of index information for each of the two selected precoding matrixes, and index information of a precoding matrix corresponding to a combination of the two selected precoding matrixes, wherein the two selected precoding matrixes include a first precoding matrix used for intra-group precoding and a second precoding matrix used for inter-group precoding, and wherein the intra-group precoding and the inter-group precoding are performed using at least two antenna groups, each of the at least two antenna groups including at least two antennas, wherein the intra-group precoding is based on a high spatial correlation to a linear array antenna in a transmit antenna group of the at least two transmit antenna groups and the inter-group precoding is based on a low spatial correlation in between the at least two transmit antenna groups.