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Limited Feedback Approach in Beamforming System over Temporally-correlated Channels |
Wu Min; Shen Chao; Qiu Zheng-ding |
Institute of Information Science, Beijing Jiaotong University, Beijing 100044, China |
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Abstract 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.
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Received: 14 November 2008
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