Patent ID: 8331464

Claim:
A method for a transmitter transmitting data to a receiver in a multiple-antenna system using a plurality of subcarriers, the method comprising: selecting a precoding matrix (P) from a codebook as a first part of a phase shift based precoding matrix; determining a diagonal matrix (D) for phase shift as a second part of the phase shift based precoding matrix; determining a unitary matrix (U) as a third part of the phase shift based precoding matrix; performing precoding by multiplying the phase shift based precoding matrix by transmission symbol streams of a corresponding resource, wherein the phase shift based precoding matrix is acquired by P*D*U; and transmitting the precoded transmission symbol streams to the receiver via N t transmission antennas, wherein performing precoding comprises multiplying the P to the D*U multiplied transmission symbol streams to produce N t transmission symbol streams, wherein a number of the D*U multiplied transmission symbol streams is R, wherein R is a spatial multiplexing rate.