时间相干信道下波束赋形系统的有限反馈方法

该文提出一种新的基于树形码书的有限反馈方法，由于相邻帧的时间相干性，信道向量的量化码字可建模为一阶有限状态马尔可夫链，当前帧信道向量被量化到前一帧最大转移概率码字的子码字上，该子码字的索引以1 bit反馈给发射端。链路仿真结果表明本文所提方法相比普通反馈方法可明显改善误码率性能，某些条件下还可降低反馈速率。

Limited Feedback Approach in Beamforming System over Temporally-correlated Channels

This paper proposes a new limited feedback approach based on tree-structure codebook. As the temporally-correlation across adjacent frames, the quantized channel vector codeword can be modeled as a first-order finite-state Markov chain. The channel vector of current frame is quantized into son-codeword of the codeword with the most transition probabilities corresponding to the previous frame. The index of the son-codeword is fed back to the transmitter with 1 bit feedback. The link simulation results show that, the proposed approach can significantly improve the BER performance relative to the common approach, and the feedback rate can be reduced under some conditions.