Low complexity power allocation for hybrid amplify-and-forward opportunistic relay ordering cooperation  

作　　者：CHENG Yu-lun YANG Long-xiang 

机构地区：[1]Jiangsu Key Laboratory of Wireless Communications, Key Laboratory on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education, Nanjing University of Posts and Telecommunications

出　　处：《The Journal of China Universities of Posts and Telecommunications》2013年第3期26-31,共6页中国邮电高校学报（英文版）

基　　金：supported by the National Basic Research Program of China (2013CB329104);the National Natural Science Foundations of China (61071090, 61171093);the Postgraduate Innovation Programs of Jiangsu Scientific Research (CXZZ11_0388);the Natural Science Foundation Key Projects of Jiangsu (11KJA510001);the National Major Projects of Science and Technology (2011ZX03005-004-003);Jiangsu 973 Projects (BK2011027)

摘　　要：In this paper, to enhance the robustness against link imbalance, a hybrid cooperative protocol is proposed for amplify-and-forward （AF） opportunistic cooperation, where opportunistic relaying and multi-hop cooperation with relay ordering （RO） are dynamically selected to maximize the end to end signal-noise ratio （SNR）, and the power allocation coefficient is optimized under total power constraint accordingly. Furthermore, a suboptimum allocation scheme with low complexity is proposed by employing the upper bound of harmonic mean. Simulation results show that the proposed scheme outperforms conventional AF opportunistic cooperation in variety of line type topology. Moreover, the efficiency of the proposed suboptimum allocation is also validated in large SNR region.In this paper, to enhance the robustness against link imbalance, a hybrid cooperative protocol is proposed for amplify-and-forward （AF） opportunistic cooperation, where opportunistic relaying and multi-hop cooperation with relay ordering （RO） are dynamically selected to maximize the end to end signal-noise ratio （SNR）, and the power allocation coefficient is optimized under total power constraint accordingly. Furthermore, a suboptimum allocation scheme with low complexity is proposed by employing the upper bound of harmonic mean. Simulation results show that the proposed scheme outperforms conventional AF opportunistic cooperation in variety of line type topology. Moreover, the efficiency of the proposed suboptimum allocation is also validated in large SNR region.

关 键 词：opportunistic cooperation MULTI-HOP RO AF power allocation 

分 类 号：TN911.4[电子电信—通信与信息系统]