5th International ICST Conference on Communications and Networking in China

Research Article

Coordinated beamforming in downlink CoMP transmission system

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  • @INPROCEEDINGS{10.4108/chinacom.2010.151,
        author={Li Qiang and Yang Yang and Fang Shu and Wu Gang},
        title={Coordinated beamforming in downlink CoMP transmission system},
        proceedings={5th International ICST Conference on Communications and Networking in China},
        keywords={LTE-A CoMP inter-cell interference joint processing/transmission coordinated beamforming},
  • Li Qiang
    Yang Yang
    Fang Shu
    Wu Gang
    Year: 2011
    Coordinated beamforming in downlink CoMP transmission system
    DOI: 10.4108/chinacom.2010.151
Li Qiang1,*, Yang Yang1,*, Fang Shu1,*, Wu Gang1,*
  • 1: National Key Laboratory Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China
*Contact email: liqiang1@uestc.edu.cn, yangyang@uestc.edu.cn, fangshu@uestc.edu.cn, wugang99@uestc.edu.cn


Coordinated multi-point transmission/reception (CoMP) technique for 3GPP LTE-Advanced is to reduce the inter-cell interference (ICI) effectively, so as to enhance data rate/coverage and throughput for cell-edge users significantly. For downlink CoMP, most research work mainly focuses on joint processing/transmission (CoMP-JP) mode. However this mode needs the access points (AP) to share the UEs' data and channel state information (CSI) simultaneously, resulting in a high overhead on the network. Coordinated beamforming (CoMP-CBF), which can avoid the data information exchange is a better solution to reduce the overhead. In this paper, we propose a coordinated beamforming scheme in downlink CoMP transmission system. The proposed scheme exploits the signal leakage information to other cells to design the precoding vector to reduce the ICI. The simulation results indicate that the proposed scheme offers much higher performance gain compared with the CoMP-JP mode.