| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication base station device, a radio communication terminal device, and a feedback method that reduce overhead of feedback information while maximizing transmission capacity in an uplink MU-MIMO of a TDD-MIMO system.SOLUTION: A base station, at ST305, determines a transmission weight conversion matrix by multiplying a first transmission weight matrix of the SU-MIMO standard by it so that transmission capacity at the MU-MIMO will be maximized, and at ST306, gives feedback about a TMI associated in advance with the determined transmission weight conversion matrix to a terminal. The terminal, at ST309, multiplies the first transmission weight matrix of the SU-MIMO standard by a transmission weight conversion matrix corresponding to the TMI fed back by the base station, and generates a second transmission weight matrix determined so that the transmission capacity at the MU-MIMO will be maximized, and at ST310, multiplies transmission data by the second transmission weight matrix and transmits the result. |
