Patent ID: 8155231

Claim:
A method for selecting a transmit antenna of a transmitter by a receiver in an orthogonalized spatial multiplexing system, the method comprising: upon receipt of symbols from the transmitter with multiple transmit antennas, decoding each of the received symbols; determining a rotation angle in order that columns of an effective channel matrix for the received symbols have orthogonality, and determining an optimal subset for the multiple transmit antennas using the determined rotation angle and a distance between the decoded symbols; and generating feedback information including the determined rotation angle and the determined optimal subset, and transmitting the generated feedback information to the transmitter, wherein the rotation angle is determined depending on first channel responses between a first transmit antenna and multiple receive antennas and second channel responses between a second transmit antenna and the multiple receive antennas, wherein the determining the optimal subset comprises determining the optimal subset for the multiple transmit antennas by means of a set of maximizing a squared minimum distance between the decoded symbols, and wherein a distance between the decoded symbols is determined by using difference vectors excluding difference vectors having a same value from each other and collinear difference vectors, among difference vectors in a constellation.