Limited Feedback Based on Tree-structured Codebook for MIMO Systems over Time-varying Channels
نویسندگان
چکیده
In this paper, we propose a novel limited feedback approach for MIMO systems with transmit beamforming over time-varying channels, where the optimal beamforming vector of the current frame is selected from the son-codewords of the codewords neighboring to previous beamforming codeword. The proposed approach exploits the channel temporal correlation to improve the CSI quantized precise. The simulation results show that the proposed approach can efficiently improve the BER performance relative to the common feedback approach, and the feedback rate can be further reduced under some conditions. Moreover, the effect of Doppler frequency shift on the performance of the proposed approach is analyzed.
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