选择软消息转发协作下的物理层网络编码  

Physical Layer Network Coding by Selective Soft⁃Message⁃Forward

作　　者：林昀轩 刘超[1] 包建荣[1] 姜斌[1] 吴俊 LIN Yun-xuan;LIU Chao;BAO Jian-rong;JIANG Bin;WU Jun(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018

出　　处：《电子学报》2021年第7期1450-1456,共7页Acta Electronica Sinica

基　　金：国家自然科学基金(No.U1809201);浙江省属高校基本科研业务费专项资金(No.GK209907299001⁃003,No.GK209907299001⁃023);浙江省自然科学基金(No.LY20F010010)。

摘　　要：为解决5G协作通信中基于软消息转发协作(Soft⁃Message⁃Forward,SMF)物理层网络编码存在的噪声放大等问题,提出一种基于选择软消息转发(Selective Soft⁃Message⁃Forward,SSMF)协作的物理层网络编码及其门限判决译码算法.根据迫零检测后噪声最小的叠加信号可靠性最高原理,从中继节点接收信号集中选择可靠性最高的信号,映射为对数似然比形式,来提升误码率(Bit Error Ratio,BER)性能,并降低复杂度.仿真表明:采用二进制相移键控调制,且各信道为准静态瑞利衰落信道时,所提SSMF协作编码性能相对更优.当BER为10^(-3)时,相对去噪转发分集、SMF及译码转发协作方案,所提协作可分别获得约0.7dB、1.1dB与2.3dB的性能增益.To solve the problem of noise amplification of the physical layer network coding(PNC)by soft⁃message⁃forward(SMF)in the fifth⁃generation cooperative communication,this paper proposes a PNC with selective soft⁃message⁃forward(SSMF)and a decoding scheme based on threshold decision.According to the principle that the super⁃position signal with minimum noise after zero forcing detection has the highest reliability,selecting the most reliable signal from the received signal set at the relay node and mapping this signal into log⁃likelihood ratio metrics can improve the bit er⁃ror ratio(BER)performance and reduce the complexity.Simulation results indicate that the proposed SSMF cooperative coding performance is relatively better under quasi⁃static Rayleigh fading channel and binary⁃phase⁃shift keying(BPSK)modulation.At BER of 10^(-3),the proposed cooperative coding scheme can obtain about 0.7dB,1.1 dB and 2.3dB gains when compared with those of the denoise⁃and⁃forward based adaptive diversity scheme,the SMF scheme,and the decode⁃and⁃forward scheme,respectively.

关 键 词：双向中继系统 协作编码 选择软消息转发协作 多输入多输出 物理层网络编码 协作通信 

分 类 号：TN911[电子电信—通信与信息系统]