摘要
通过对BCJR译码算法中信噪比失配对Turbo码译码性能影响的分析,证明了Turbo码迭代译码过程中的信噪比估计对Turbo码的译码性能有着直接的影响。对于Turbo码BCJR译码算法中信噪比估计,提出了自适应信噪比估计器来估计BCJR算法中信噪比失配的设计方案。该方案能以较为简单的运算很好地跟踪Turbo码译码过程中信噪比变化,Matlab的模拟仿真试验证明了该方案在底信噪比条件下具有很好的收敛性,且衰落信道的条件下更为有利。
Based on analyzed the sensitivity of the Turbo decoder performance to misestimate the signaltonoise ratio of channel (SNR),we verified the directly relationship between the iterative decoding of Turbo decoding and esstimation of SNR.This paper presented a method of selfadaptive estimating SNR of BCJR decoding algorithm of Turbo code.The selfadaptive SNR estimator has a good tracking performance with a simpler calculation.The resulte of Matlab simulation shows that the selfadaptive SNR estimator has excellence convergence for low SNR and performace will be better on a fading channel.
出处
《桂林电子工业学院学报》
2002年第6期6-9,共4页
Journal of Guilin Institute of Electronic Technology
基金
广西自然科学基金项目(9912O07)
