无线多中继系统中判决门限辅助的快速Z转发协作  

Decision Threshold-aided Fast Z-Forward in Wireless Multirelay Communications

作　　者：包建荣[1] 林昀轩 刘超[1] 姜斌[1] 朱芳[1] 何剑海[2] BAO Jianrong;LIN Yunxuan;LIU Chao;JIANG Bin;ZHU Fang;HE Jianhai(School of Telecommunication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;School of Electronic Information Engineering,Ningbo Polytechnic,Ningbo 315800,China)

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018 [2]宁波职业技术学院电子信息工程学院,宁波315800

出　　处：《电子与信息学报》2021年第5期1315-1322,共8页Journal of Electronics & Information Technology

基　　金：浙江省公益技术研究计划(LGG18F010011,LGG19F010004);浙江省属高校基本科研业务费专项资金(GK209907299001-003);国家自然科学基金(U1809201);浙江省自然科学基金(LY20F010010)。

摘　　要：针对Z向转发(ZF)协作所有中继节点均参与协作转发导致的能耗利用不合理问题,该文提出了一种适用于多中继场景下的门限辅助判决快速Z转发(DT-FZF)协作。当中继节点处接收信号对数似然比(LLR)的绝对值小于门限时,中继节点不参与协作转发;否则中继节点协作转发经截断后的对数似然比(LLR)。放大转发(AF)、译码转发(DF)、分段转发(PF)和ZF协作可看作DT-FZF协作的特殊情况。在三中继系统,误比特率(BER)为10–3时,相比ZF协作,所提协作可获得约0.8 dB的性能增益。In consideration of improper power allocation and insufficient relay selection in the current ZForward(ZF)scheme,an efficient Decision Threshold-aided Fast Z-Forward(DT-FZF)scheme is proposed to improve power and transmission efficiency.When the absolute value of the Log-Likelihood Ratio(LLR)of a source-relay reception is less than the decision threshold,the relay remains quiet.Otherwise,it directly sends the truncated LLR to the destination.In addition,the proposed DT-FZF scheme incorporates the Amplify-Forward(AF),Decode-Forward(DF),Piecewise-Forward(PF)and ZF schemes,all of which can be the special case of the proposed scheme.At a Bit Error Rate(BER)is of 10–3,the DT-FZF scheme outperforms the ZF scheme by approximately 0.8 dB in a three-relay system.

关 键 词：多中继网络 协作通信 快速Z向转发 判决门限 

分 类 号：TN911[电子电信—通信与信息系统]