基于Turbo编码的DMT系统性能分析与仿真  

Performance analysis and simulation of DMT system based on Turbo code

作　　者：唐凌花[1] 都思丹[1] 方承志[1] 

机构地区：[1]南京大学电子科学与工程系,南京210093

出　　处：《电子测量技术》2008年第3期147-150,共4页Electronic Measurement Technology

摘　　要：本文提出了一种将Turbo编码与离散多音频超高数字用户线(DMT-VDSL)结合的构架,以解决传统最佳接收机中符号判决带来的译码损失,使其适合高速数字传输系统。该构架利用Turbo码在加性高斯白噪声信道中的出众表现来提高DMT系统性能;同时,将Turbo迭代译码思想引入到联合检测,有机结合信道译码和多用户检测技术,通过迭代交换软MUD及软信道译码间的信息来逼近最优检测。仿真结果表明,该构架拥有优异的性能,并且在2次迭代后就能收敛,减小接收端的延时,提高了系统的有效性。A kind of frame combining Turbo code and DMT-VDSL is presented to solve the problem of information loss caused by symbol estimation in conventional optimum detector, adapting to high speed digital transmission systems, improving the system performance for the great capability of Turbo coding in AWGN channel. Meanwhile, the iterative decoding idea is introduced to the combining detection. Channel decoding and multiuser detection are integrated and the resulting iteration between soft MUD and soft channel decoding yields quite good results. The simulation results verify the improvements of performances both in SNR and convergence.

关 键 词：TURBO码 TURBO检测 离散多音频 超高数字用户线 系统码 MAP算法 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]