Codebook for eight transmit antennas and multiple input multiple output communication system using the codebook

摘要

A transmitter and a receiver of a multiple input multiple output (MIMO) communication system may use two codebooks to share channel information. When the transmitter uses eight transmit antennas, two codebooks may be defined. When the receiver generates two precoding matrix indicators from two codebooks, a combination of the two precoding matrix indicators may indicate a single precoding matrix. Precoding matrix candidates may also be defined.

主权项

1. A communication method of a receiver, the communication method comprising:
determining a first precoding matrix indicator (PMI) and a second precoding matrix indicator (PMI); and transmitting, to a transmitter, the first and the second PMIs as a feedback information, wherein a precoding matrix is determined comprising a plurality of 8×1 preceding matrixes comprising a 4×1 upper matrix A and a 4×1 lower matrix B·A for rank 1, wherein A is determined based on an equation expressed as:
A=[(1ej2πn/32ej4πn/32ej6πn/32]T, where n is determined based on the first PMI, and wherein B is determined to be one of 1, j, −1 and −j based on the second PMI, with j being an imaginary number.