Quantifying the power loss when transmit beamforming relies on finite-rate feedback

被引：144

作者：

Zhou, SL ^{[1
]}

Wang, ZD

Giannakis, GB

机构：

[1] Univ Connecticut, Dept Elect & Comp Engn, Storrs, CT 06269 USA

[2] Iowa State Univ Sci & Technol, Dept Elect & Comp Engn, Ames, IA 50011 USA

[3] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

来源：

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2005年 / 4卷 / 04期

基金：

美国国家科学基金会;

关键词：

finite-rate feedback; multi-antenna systems; power loss; transmit beamforming;

D O I：

10.1109/TWC.2005.850259

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Transmit beamforming achieves optimal performance in systems with multiple transmit antennas and a single receive antenna from both the capacity and the received signal-to-noise ratio (SNR) perspectives but ideally requires perfect channel knowledge at the transmitter. In practical systems where the feedback link can only convey a finite number of bits, transmit beamformer designs have been extensively investigated using either the outage probability or the average SNR as the figure of merit. In this paper, we study the symbol error rate (SER) for transmit beamforming with finite-rate feedback in a multi-input single-output setting. We derive an SER lower bound that is tight for good beamformer designs. Comparing this bound with the SER corresponding to the ideal case, we quantify the power loss due to the finite-rate constraint across the entire SNR range.

引用

页码：1948 / 1957

页数：10

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