Patent ID: 7831232

Claim:
A multiple input multiple output communication apparatus, comprising: a plurality of antennas for conducting a wireless communication; a switch for switching the plurality of antennas; and a control device for determining a combination of at least two antennas used for a multiple input multiple output communication from the plurality of antennas using signal to interference plus noise ratio information and spatial fading correlation information as a selection reference, and for outputting a selection signal for a selection of the at least two antennas to the switch, wherein: the plurality of antennas are divided into M branches each including two or more antennas; SINR m l m indicates a signal to interference plus noise ratio in an l m -th antenna in an m-th branch of the M branches, l m varying from 1 to the number of antennas of the m-th branch L m ; C m 1 ,m 2 indicates a fading correlation between an l m1 -th antenna in an m1-th branch of the M branches and an l m2 -th antenna in an m2-th branch of the M branches, l m1 and l m2 varying from 1 to L m1 and L m2 , respectively; and the control device uses an evaluation function ∑ m = 1 M ⁢ ⁢ SINR m l m ∏ m 1 < m 2 ⁢ ⁢ C m 1 , m 2 for determining the combination of the at least two antennas, ∑ m = 1 M ⁢ ⁢ SINR m l m ⁢ and ∏ m 1 < m 2 ⁢ ⁢ C m 1 , m 2 varying depending on values of l 1 through l M , and selects l 1 -th through l M -th antennas from first through M-th branches where the value of the evaluation function is the maximum with the at least two antennas.