Multi-antenna adaptive modulation and transmit beamforming based on bandwidth-constrained feedback

Author

Xia, Pengfei ; Zhou, Shengli ; Giannakis, Georgios B.

Author_Institution

Dept. of Electron. Comput. Eng., Minnesota Univ., Minneapolis, MN, USA

Volume

1

fYear

2003

fDate

9-12 Nov. 2003

Firstpage

187

Abstract

Adaptive modulation has the potential to increase system throughput considerably by matching transmission parameters to the time-varying channel conditions. Crucial to adaptive systems is the requirement of a feedback channel, that often carries only a limited number of bits. Under such a bandwidth-constrained feedback link, we aim to optimize a multi-antenna system based on transmit beamforming and adaptive modulation, where the transmit-power, the signal constellation, the beamforming direction, and the feedback strategy, are designed jointly. Our proposed nested iterative approach leads to an approximate yet practical solution. Simulation results demonstrate considerable improvement in transmission rate, as the number of feedback bits increases.

Keywords

adaptive antenna arrays; adaptive modulation; array signal processing; bandwidth allocation; error statistics; feedback; iterative methods; optimisation; time-varying channels; BER; bandwidth-constrained feedback; bit error rate; iterative approach; multiantenna adaptive modulation; optimization; signal constellation; time-varying channel; transmit beamforming; Adaptive systems; Array signal processing; Constellation diagram; Design optimization; Feedback; Iterative methods; Optical modulation; Signal design; Throughput; Time-varying channels;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2004. Conference Record of the Thirty-Seventh Asilomar Conference on

Print_ISBN

0-7803-8104-1

Type

conf

DOI

10.1109/ACSSC.2003.1291894

Filename

1291894