標題: Robust Linear Beamformer Designs for Coordinated Multi-Point AF Relaying in Downlink Multi-Cell Networks
作者: Kuo, Chun-I
Wu, Sau-Hsuan
Tseng, Chun-Kai
電信工程研究所
Institute of Communications Engineering
關鍵字: Robust beamforming;CoMP;AF relaying;downlink multi-cell networks;network MIMO
公開日期: 1-九月-2012
摘要: Robust beamforming methods are studied to support relay-assisted coordinated multi-point (CoMP) retransmissions in downlink multi-cell networks. Linear beamformers (BFers) for relay stations of different cells are jointly designed to maintain, in a CoMP amplify-and-forward (AF) relaying manner, the target signal to interference-plus-noise ratios (SINR) at the cellular boundaries of this type of networks. Considering the feasibility in realizations and deployments, BFer designs are only allowed to use the channel state information (CSI) feedbacks of the wireless links inside a network. This kind of designs turns out to be a challenging optimization problem when attempting to maintain the SINR under the estimation and quantization errors in CSI. A conservative criterion and solution method is proposed for this robust design problem. Despite the conservativeness, the proposed method appears to provide an effective BFer design for CoMP AF relaying, either from the perspective of power consumption or from the viewpoints of BFers' complexity and feasibility in syntheses. Simulations also show that when applying the proposed CoMP AF relaying method in Automatic Retransmission reQuest (ARQ), data throughput can be efficiently increased for users close to the joint cellular boundaries inside a multi-cell network.
URI: http://dx.doi.org/10.1109/TWC.2012.072512.111764
http://hdl.handle.net/11536/20318
ISSN: 1536-1276
DOI: 10.1109/TWC.2012.072512.111764
期刊: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume: 11
Issue: 9
起始頁: 3272
結束頁: 3283
顯示於類別:期刊論文


文件中的檔案:

  1. 000309188400024.pdf