Multiantenna adaptive modulation with beamforming based on bandwidth-constrained feedback

Author

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

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA

Volume

53

Issue

3

fYear

2005

fDate

3/1/2005 12:00:00 AM

Firstpage

526

Lastpage

536

Abstract

Adaptive modulation has the potential to increase system throughput considerably by adapting transmission parameters to the time-varying channel characteristics. Crucial to adaptive systems is the requirement of a feedback channel, that is often capable of carrying only a limited number of bits. Under such a bandwidth-constrained feedback link, we aim to optimize a multiantenna 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 modulation; antenna arrays; feedback; iterative methods; optimisation; time-varying channels; bandwidth-constrained feedback; feedback channel; multiantenna adaptive modulation; signal constellation; time-varying channel characteristic; Adaptive systems; Array signal processing; Constellation diagram; Design optimization; Feedback; Iterative methods; Optical modulation; Signal design; Throughput; Time-varying channels; Adaptive modulation; beamforming; feedback; vector quantization;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2005.843431

Filename

1413597