Patent ID: 8284849

Claim:
A method of transmitting data from a transmitter 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) having a form of a Discrete Fourier Transform (DFT) matrix as a third part of the phase shift based precoding matrix; and 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 as P*D*U, wherein the precodinq matrix (P) is of size Nt-by-R, wherein the diagonal matrix (D) is of size R-by-R, wherein the unitary matrix (U) is of size R-by-R, wherein Nt is the number of transmission antennas, and wherein R is a spatial multiplexing rate.