arXiv 1306.36222013-06-16cs.ITmath.IT

一种利用时间和谱相关性的差分反馈方案

A Differential Feedback Scheme Exploiting the Temporal and Spectral Correlation

Mingxin Zhou, Leiming Zhang, Lingyang Song, Merouane Debbah

摘要：

有限反馈信道提供的信道状态信息（CSI）可以用来提高系统的吞吐量。然而，在多输入多输出（MIMO）系统中，实现该CSI反馈的信令开销可能相当大，而上行链路反馈信道的容量通常是有限的。因此，减少反馈比特的数量至关重要。有限反馈压缩的现有工作通常采用块衰落信道模型，其中仅考虑无线信道中的时间或频谱相关性。在本文中，我们提出了一个差分反馈方案，充分利用时间和频谱相关性，以减少反馈负载。然后，研究了MIMO双选择性衰落信道下的最小差分反馈速率。最后通过仿真验证了分析的正确性。

英文摘要：

Channel state information (CSI) provided by limited feedback channel can be utilized to increase the system throughput. However, in multiple input multiple output (MIMO) systems, the signaling overhead realizing this CSI feedback can be quite large, while the capacity of the uplink feedback channel is typically limited. Hence, it is crucial to reduce the amount of feedback bits. Prior work on limited feedback compression commonly adopted the block fading channel model where only temporal or spectral correlation in wireless channel is considered. In this paper, we propose a differential feedback scheme with full use of the temporal and spectral correlations to reduce the feedback load. Then, the minimal differential feedback rate over MIMO doubly selective fading channel is investigated. Finally, the analysis is verified by simulations.

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