Quantifying the power loss when transmit beamforming relies on finite-rate feedback
Quantifying the power loss when transmit beamforming relies on finite-rate feedback
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DOI：
10.1109/twc.2005.850259
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发表时间：
2005-07
影响因子：
10.4
通讯作者：
Shengli Zhou;Zhengdao Wang;G. Giannakis
中科院分区：
文献类型：
--
作者：
Shengli Zhou;Zhengdao Wang;G. Giannakis
发射波束成形在具有多个发射天线和单个接收天线的系统中从容量和接收信噪比（SNR）的角度实现最佳性能，但理想地在发射机处需要完美的信道知识。在反馈链路只能传送有限数量比特的实际系统中，已经使用中断概率或平均SNR作为品质因数来广泛研究了发射波束形成器设计。本文研究了多输入单输出条件下有限速率反馈发射波束形成系统的误符号率。我们推导出一个SER下限，是紧良好的波束形成器的设计。比较这个绑定与SER对应的理想情况下，我们量化的功率损耗，由于在整个SNR范围内的有限速率约束。
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.