Apparatus and method for channel state information codeword construction for a cellular wireless communication system

摘要

A mobile station configured to receive transmissions from a two-dimensional array of antennas at a base station is provided. A main processor of the mobile station is configured to estimate first and second channel states and determine a co-phasing scalar component for each of multiple groups of antennas in the array based on the first channel state. The main processor is configured to generate a matrix X that includes a plurality of column vectors selected from a codebook based on the second channel state, generate a matrix P 1 , wherein the matrix P 1 is a block diagonal matrix having the matrix X for each block diagonal element, and generate a matrix P 2 . The main processor is also configured to transmit to the base station information corresponding to the matrix P 1 and to the matrix P 2 , as well as a CQI that is derived with a precoding matrix P defined by P=P 1 P 2.