TH预编码的超奈奎斯特系统残余干扰消除算法  

A Residual Interference Cancellation Algorithm for Faster-Than-Nyquist System on Tomlinson-Harashima Precoding

作　　者：邱壮彬 彭端[2] QIU Zhuangbin;PENG Duan(School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China;Department of Experimental Teaching,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学信息工程学院,广州510006 [2]广东工业大学实验教学部,广州510006

出　　处：《电讯技术》2023年第3期427-433,共7页Telecommunication Engineering

基　　金：广东省科技计划项目(2014A010103025)。

摘　　要：超奈奎斯特(Faster-Than-Nyquist,FTN)技术能够有效提高传输系统的频谱效率,然而代价是引入了严重的码间串扰(Inter-Symbol Interference,ISI)。在基于Ungerboeck模型的FTN系统中的发送端使用TH预编码(Tomlinson-Harashima Precoding,THP)并不能完全有效消除FTN系统所引入的ISI,会存在残余ISI。对此,针对FTN系统中的残余干扰提出了两种接收端检测算法,分别是基于后向串行干扰消除(Backward Serial Interference Cancellation,BSIC)的无迭代检测算法和基于连续干扰消除(Successive Interference Cancellation,SIC)的Turbo迭代均衡改进算法,并通过蒙特卡洛方法寻找最优的扩展取模间隔。计算机数值仿真结果表明,在选定的扩展取模间隔下,两种接收端检测算法在FTN系统的加速因子为0.8和0.9时均能有效消除FTN技术所引入的ISI,其误码率趋近于奈奎斯特正交传输性能。Faster-Than-Nyquist(FTN)technology can effectively improve the spectral efficiency of transmission system,but the cost is the introduction of serious inter-symbol interference(ISI).Using Tomlinson-Harashima precoding(THP)in the sending end of the FTN system based on the Ungerboeck model cannot effectively eliminate the ISI introduced by the FTN system,and there will be residual ISI.In this regard,two receiver detection algorithms are proposed for the residual interference in the FTN system,namely,a non-iterative detection method based on backward serial interference cancellation(BSIC)and an improvement method of Turbo iterative equalization based on successive interference cancellation(SIC),as well as through Monte Carlo method to find the optimal extended modulus interval.The computer numerical simulation results show that under the selected extended modulus interval,the two receiver detection methods can effectively eliminate the ISI introduced by the FTN technology when the acceleration factor of the FTN system is 0.8 and 0.9,and the bit error rate tends to be close to Nyquist orthogonal transmission performance.

关 键 词：超奈奎斯特系统(FTN) TH预编码(THP) 连续干扰消除(SIC) TURBO均衡 

分 类 号：TN911.23[电子电信—通信与信息系统]