Optimal power allocation to minimize SER for multinode amplify-and-forward cooperative communication systems  

作　　者：LIN Fei LIU Xi-mei LUO Tao YUE Guang-xin 

机构地区：[1]Digital Communications and Networking Laboratory, Beijing University of Posts and Telecommunications, Beijing 100876, China [2]School of Electronic Information and Control Engineering, Shandong Institute of Light Industry, Jinan 250353, China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2008年第4期14-18,23,共6页中国邮电高校学报（英文版）

基　　金：the National Natural Science Foundation of China (60472070, 60672123);the Specialized Research Fund for the Doctoral Program of Higher Education (20050013005)

摘　　要：An optimal power allocation （OPA） method with mean channel gains is proposed for a multinode amplify-and-forward cooperative communication system. By making use of M-PSK modulation, a closed-form symbol-error-rate （SER） formulation and corresponding upper bound are first derived. Subsequently the OPA method is utilized to minimize the SER. Comparison of the SER of the proposed OPA method with that of the equal power allocation （EPA） method, shows that the SER of both methods, which is approximately optimal performance, is almost the same when relays are near the source. OPA outperforms the EPA when the relays are near the middle between the source and destination or near the destination. The proposed OPA method depends only on the ratio of mean channel gains of the source-to-relay to those of the relay-to-destination. Extensive simulations are performed to validate the theoretical results.An optimal power allocation （OPA） method with mean channel gains is proposed for a multinode amplify-and-forward cooperative communication system. By making use of M-PSK modulation, a closed-form symbol-error-rate （SER） formulation and corresponding upper bound are first derived. Subsequently the OPA method is utilized to minimize the SER. Comparison of the SER of the proposed OPA method with that of the equal power allocation （EPA） method, shows that the SER of both methods, which is approximately optimal performance, is almost the same when relays are near the source. OPA outperforms the EPA when the relays are near the middle between the source and destination or near the destination. The proposed OPA method depends only on the ratio of mean channel gains of the source-to-relay to those of the relay-to-destination. Extensive simulations are performed to validate the theoretical results.

关 键 词：AMPLIFY-AND-FORWARD multinode cooperative communications SER power allocation 

分 类 号：TB91[一般工业技术—计量学]