Phase shift based precoding method and transceiver for supporting the same

A transceiver for transmitting data to a receiver in a multiple-antenna system using a plurality of subcarriers, the transceiver comprising:

• a precoding matrix determining module for:
• 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 having a form of a Discrete Fourier Transform (DFT) matrix as a third part of the phase shift based precoding matrix;
• and
• determining the phase shift based precoding matrix P*D*U;
• and
• a precoding module for multiplying the determined phase shift based precoding matrix by transmission symbol streams of a corresponding resource,
• wherein the precoding 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.

A method of receiving data in a receiver from a transmitter in a multiple-antenna system using a plurality of subcarriers, the method comprising:

• receiving a signal transmitted from the transmitter via Nt transmission antennas;
• 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 an inverse function of a precoding performed at the transmitter using the phase shift based precoding matrix, wherein the phase shift based precoding matrix is acquired as P*D*U
• wherein the precoding 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.