Patent ID: 8942126
Filing Date: 2015-01-27
Classification: H04B,H04L

Abstract:
1. A feedback information transmission method to assume a Hermitian transpose of a precoding matrix corresponding to a PMI that is selected in accordance with an amount of channel variation as a channel matrix and transmit feedback information to use in MIMO transmission to a base station apparatus, the feedback information transmission method comprising the steps of: selecting the PMI and an RI in accordance with the amount of channel variation; measuring a CQI for single-user MIMO transmission in accordance with the amount of channel variation; calculating complementary information that complements a difference between the CQI for single-user MIMO transmission and a CQI for multi-user MIMO transmission; and transmitting the PMI, RI, CQI for single-user MIMO transmission and complementary information to the base station apparatus as the feedback information, wherein difference information between the CQI for single-user MIMO transmission, and a CQI for multi-user MIMO transmission that is calculated by estimating multiple access interference, is calculated as the complementary information, and difference information corresponding to a CQI for single-user MIMO transmission having a greater value in a plurality of CQIs for single-user MIMO transmission to match the rank to feed back in the RI, is calculated and included in the feedback information.