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首页> 外文会议>Annual Allerton Conference on Communication, Control, and Computing; 20040929-1001; Monticello,IL(US) >Performance Bounds for Limited Feedback MIMO Beamforming Systems
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Performance Bounds for Limited Feedback MIMO Beamforming Systems

机译：有限反馈MIMO波束成形系统的性能界限

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摘要

Multiple-input multiple-output (MIMO) wireless systems can achieve significant diversity and array gain by using transmit beamforming and receive combining. In the absence of full channel knowledge at the transmitter, a quantized beamforming vector can be made available to the transmitter using a low-rate feedback channel, called limited feedback. A codebook based quantization approach is considered. Based on metrics such as signal-to-noise ratio and outage probability, maximization of the minimum distance between any pair of codewords has already been proposed as a codebook design criterion. An upper bound on the average SNR achieved by an optimal codebook designed using such criterion is derived as a function of the feedback rate. A lower bound on outage probability is also obtained. This analysis quantifies the impact of the feedback rate and the number of transmit and receive antennas on the performance of the system.
机译：多输入多输出（MIMO）无线系统可以通过使用发射波束成形和接收组合来获得显着的分集和阵列增益。在发射机没有完整的信道知识的情况下，可以使用称为受限反馈的低速率反馈信道使量化的波束成形矢量对发射机可用。考虑基于码本的量化方法。基于诸如信噪比和中断概率之类的度量，已经提出了任意一对码字之间的最小距离的最大化作为码本设计标准。通过使用这种准则设计的最佳码本获得的平均SNR上限是作为反馈速率的函数得出的。还可以确定中断概率的下限。该分析量化了反馈速率以及发射和接收天线的数量对系统性能的影响。

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