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

Jianxin DAI  Ming CHEN  Mei ZHAO  Ziyan JIA  Zhengquan LI  

IEICE TRANSACTIONS on Communications   Vol.E97-B    No.1    pp.171-181
Publication Date: 2014/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E97.B.171
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
coordinated multi-point,  net ergodic capacity,  limited feedback,  splitting factor,  coordinated set,  

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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.