Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2008
Session Number:B1
Session:
Number:B1-3
Antenna-Permutation Channel-Vector Quantization for Finite Rate Feedback in Block-Diagonalizing Beamforming Multiuser MIMO-OFDM Systems
Masaaki Fujii,
pp.-
Publication Date:2008/7/7
Online ISSN:2188-5079
Summary:
An antenna-permutation (AP) scheme is described for channel vector quantization (CVQ) in block-diagonalizing beamforming (BDBF) multiuser multiple-input and multiple output (MU-MIMO) orthogonal frequency-division multiplexing (OFDM) systems with four receive antennas. The channel vectors for two receive antennas are quantized to a single quantization vector for finite rate feedback by maximum-ratio transmission (MRT). The combinations of two antennas from among the four receive antennas are cyclically permutated for subcarriers. By doing so, BDBF provides severer frequency selectivity. This can be exploited by channel decoding as a larger frequency diversity gain. Simulation results demonstrate that AP-MRT-CVQ with 12-bit quantization achieved average packet error rate performance close to that in the case where perfect channel state information at the transmitter is available.