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Analysis of A Simplified Channel Estimator for MIMO Frequency Selective Channels

机译：用于MIMO频率选择通道的简化信道估计分析

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Channel estimation for multiple-input, multiple-output (MIMO) systems is studied in this paper. In particular, we present a simplified MIMO channel estimator based on orthogonal design. The performance of the proposed scheme is theoretically analyzed and compared to that of the optimum maximum likelihood estimator. The effect of non-orthogonality of the training sequences is investigated. Some modifications of the proposed estimator with sample stacking and averaging are introduced to further improve the estimation performance. This simplified scheme is evaluated in the context of the WiMAX MIMO systems in terms of mean square error for the channel estimation and bit error rate for the space-time turbo equalization. Both analytical and simulation results indicate that despite of its low computational complexity, this simplified estimator leads to minimum variance unbiased estimation and achieves identical performance to that of the maximum likelihood estimator.
机译：本文研究了多输入的信道估计，多输出（MIMO）系统。特别地，我们介绍了一种基于正交设计的简化的MIMO信道估计。理论上分析了所提出的方案的性能，并与最佳最大似然估计器的性能进行了分析。研究了训练序列的非正交性的影响。引入了具有样品堆叠和平均值的提出估计器的一些修改，以进一步提高估计性能。在WiMAX MIMO系统的上下文中，在对时空Turbo均衡的信道估计和误码率方面的均方误差方面评估该简化方案。分析和仿真结果均表明，尽管其计算复杂性低，但这种简化的估计器导致最小方差不偏的估计，并实现了最大似然估计器的相同性能。

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