CQI Feedback Overhead Reduction for Multicarrier MIMO Transmission

DOI Web Site 参考文献19件
  • ZENG Erlin
    Department of Information and Communication Engineering, Xi'an Jiaotong University The Institute of Electronics, Information and Communication Engineers
  • ZHU Shihua
    Department of Information and Communication Engineering, Xi'an Jiaotong University
  • XU Ming
    Panasonic R & D Center China Co., Ltd. The Institute of Electronics, Information and Communication Engineers

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For wideband MIMO-OFDM systems, scheduling and link adaptation are key techniques to improve the throughput performance. However, in systems without reciprocity between the uplink and the downlink channels, these techniques require a high feedback overhead of the channel quality indication (CQI) information. In this paper, we propose a novel CQI feedback reduction method, which is based on the conventional compression techniques exploiting the discrete cosine transformation (DCT). The basic idea is to adaptively permute the CQI sequences of different MIMO streams according to one of the possible patterns before the DCT compression so that the amount of feedback bits is minimized. The possible patterns used are carefully designed according to our analysis of the two types of correlations (the inter-stream correlation and the intersubband correlation) that exist in MIMO-OFDM transmission, as well as their impact on the compression efficiency. Simulation results verify that the proposed method can effectively reduce the CQI feedback overhead under varying channel conditions.

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