Fairness-oriented physical layer network coding in cooperative multiple access channels due to MRC and SIC  

作　　者：CHENG Yu-lun YANG Long-xiang 

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

出　　处：《The Journal of China Universities of Posts and Telecommunications》2012年第6期45-51,共7页中国邮电高校学报（英文版）

基　　金：supported by the National Natural Science Foundations of China(61071090, 61171093);the Postgraduate Innovation Programs of Jiangsu Scientific Research(CXZZ11_0388,CXLX11_0404);the Jiangsu Province Natural Science Foundation Key Projects(11KJA510001);the National Science and Technology Key Projects(2011ZX03005-004-003);Jiangsu 973 Projects(BK2011027)

摘　　要：This paper investigates the impacts of network coding （NC） on user fairness from the network perspective in multiple access channels. Firstly, simultaneous outage is exploited as the metric to evaluate user fairness. To optimize it, a fairness-oriented physical layer NC scheme is proposed, in which users＇ signals are superimposed in specific calculated proportion at relay and then decoded by maximal ratio combination （MRC） and serial interference cancellation （SIC） at destination. Furthermore, the influence of power allocation coefficient error on simultaneous outage is also analyzed to reveal its correlation with user fairness. Simulation results indicate that the proposed scheme can supply approximately equal performance promotion for each cooperation-participated user and outperform those without fairness consideration in terms of the employed metric.This paper investigates the impacts of network coding （NC） on user fairness from the network perspective in multiple access channels. Firstly, simultaneous outage is exploited as the metric to evaluate user fairness. To optimize it, a fairness-oriented physical layer NC scheme is proposed, in which users＇ signals are superimposed in specific calculated proportion at relay and then decoded by maximal ratio combination （MRC） and serial interference cancellation （SIC） at destination. Furthermore, the influence of power allocation coefficient error on simultaneous outage is also analyzed to reveal its correlation with user fairness. Simulation results indicate that the proposed scheme can supply approximately equal performance promotion for each cooperation-participated user and outperform those without fairness consideration in terms of the employed metric.

关 键 词：cooperative system user fairness simultaneous outage MRC SIC 

分 类 号：TN915.01[电子电信—通信与信息系统]