LLR-AWARE SMART LINK-ADAPTIVE STRATEGY FOR DECODE-AND-FORWARD COOPERATIVE COMMUNICATION  

作　　者：Cheng Yulun Yang Longxiang 

机构地区：[1]Wireless Communications Key Lab of Jiangsu Province,Nanjing University of Posts and Telecommunications [2]Key Lab of Broadband Wireless Communication and Sensor Network Technology,Ministry of Education,Nanjing University of Posts and Telecommunications

出　　处：《Journal of Electronics(China)》2013年第2期175-182,共8页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundationsof China(No.61071090,No.61171093);the Postgraduate Innovation Programs of Scientific Research of Jiangsu Province(CXZZ11_0388,CXLX11_0404);Jiangsu Province Natural Science Foundation Key Projects(11-KJA510001);National Science and Technology KeyProjects(2011ZX03005-004-003);Jiangsu 973 Projects(BK2011027)

摘　　要：Error propagation seriously degenerate the diversity order of Decode-and-Forward (DF) cooperative communication. To address this problem, a novel Log Likelihood Ratio (LLR)-based Link Adaptive Relaying (LAR) is proposed to promote adaption accuracy at relay. The instantaneous Bit Error Probability (BEP) is calculated according to the LLR of the received signals firstly, then based on it, the equivalent Signal-to-Noise Ratio (SNR) is employed to operate dynamic power scaling by relay. It is theoretically proved that the full diversity order can be attained by the scheme. Besides, the power sensitivity is also analyzed. Simulation results show that the proposed scheme outperform the conventional LAR and can achieve full diversity order. Moreover, its strong adaptation to SNR fluctuation is validated.Error propagation seriously degenerate the diversity order of Decode-and-Forward （DF） cooperative communication. To address this problem, a novel Log Likelihood Ratio （LLR）-based Link Adaptive Relaying （LAR） is proposed to promote adaption accuracy at relay. The instantaneous Bit Error Probability （BEP） is calculated according to the LLR of the received signals firstly, then based on it, the equivalent Signal-to-Noise Ratio （SNR） is employed to operate dynamic power scaling by relay. It is theoretically proved that the full diversity order can be attained by the scheme. Besides, the power sensitivity is also analyzed. Simulation results show that the proposed scheme outperform the con- ventional LAR and can achieve full diversity order. Moreover, its strong adaptation to SNR fluctuation is validated.

关 键 词：Cooperative communication Adaptive transmission Log Likelihood Ratio (LLR) Diversity order Power efficiency 

分 类 号：TN911[电子电信—通信与信息系统]