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

Pengfei Xia, Shengli Zhou, Georgios B Giannakis

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)187-191
Number of pages5
JournalConference Record of the Asilomar Conference on Signals, Systems and Computers
Volume1
StatePublished - Dec 1 2003
EventConference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States
Duration: Nov 9 2003Nov 12 2003

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