Quantized Antenna Combining for Multiuser MIMO-OFDM With Limited Feedback

Author

Sánchez-García, Jaime ; Soriano-Equigua, Leonel ; Heath, Robert W., Jr.

Author_Institution

Dept. of Electron. & Telecommun., CICESE, Ensenada, Mexico

Volume

16

Issue

12

fYear

2009

Firstpage

1027

Lastpage

1030

Abstract

A method for reducing feedback in a downlink multiuser MIMO-OFDM cellular system, with zero forcing beamforming at the base (BS) and antenna combining at each mobile (MS) is proposed. The method consists of partitioning the subcarriers into groups, choosing the quantized channel vector that better represents each group in terms of average quantization error. Numerical results show that savings up to 93% in overhead bits are obtained for SNR equal to 15 dB, with reductions in channel capacity that goes from 30% to 50% depending on the codebook size used for quantization.

Keywords

MIMO communication; OFDM modulation; antenna arrays; array signal processing; cellular radio; channel capacity; channel coding; feedback; multiuser channels; quantisation (signal); channel capacity; codebook size; feedback; multiple input multiple output systems; multiuser MIMO-OFDM cellular system; orthogonal frequency division multiplexing; quantization; quantized antenna; quantized channel vector; zero forcing beamforming; Antenna combining; MIMO-OFDM; limited feedback; multiuser communications; subcarrier grouping;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2009.2028942

Filename

5184938