Study of Coordinated Set of Coordinated Multi-Point Transmission with Limited Feedback

DOI Web Site 参考文献14件
  • DAI Jianxin
    School of Science, Nanjing University of Posts and Telecommunications National Mobile Communications Research Lab., Southeast University
  • CHEN Ming
    National Mobile Communications Research Lab., Southeast University
  • ZHAO Mei
    National Mobile Communications Research Lab., Southeast University
  • JIA Ziyan
    National Mobile Communications Research Lab., Southeast University
  • LI Zhengquan
    National Mobile Communications Research Lab., Southeast University

抄録

In the Coordinated Multi-Point (CoMP) system under the condition of limited feedback, a reasonable coordinated set relies heavily on the splitting factor that is used to divide the total feedback bits into channel direction information (CDI) feedback bits and channel quality information (CQI) feedback bits. The relation of splitting factor and coordinated set is examined in this paper. After defining a penalty factor, we derive the net ergodic capacity optimization problem, whose variables to be optimized are the number of coordinated BSs, the divided area's radius and the splitting factor. According to an existing codebook and the quantized channel error model, the downlink received signal model is updated after adding the splitting factor. Through random matrix knowledge, the stochastic property of this model is obtained. A close approximate expression including the splitting factor to be optimized related to coordinated set is given. In addition, a revised adaptive feedback scheme is proposed to split the feedback bits. Simulation results show that the proposed scheme provides a significant performance gain, especially as the user velocity is high.

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