摘要
针对符号改变率(SCR)迭代停止准则固定判决门限带来的问题,利用Turbo码的收敛特性给出一种基于信噪比估计的变门限SCR准则,该准则在不同信噪比情况下选取不同的判决门限,对低信噪比与高信噪比这2个区域进行改进。通过仿真得出,改进后的SCR准则在低信噪比与高信噪比时,能够在保证译码性能的同时,有效地减少译码的平均迭代次数,加快译码速度,提高译码效率,尤其是信噪比较低的情况下,改善的效果非常明显。
Aiming to the problems caused by the settled limit Sign Chance Ratio(SCR) stopping criterion,by using the convergence characteristic of turbo code,an alterable limit SCR stopping criterion is proposed based on the Signal to Noise Ratio(SNR) estimation.This criterion chooses different limits based on different SNRs,and it is improved especially at the low and high SNR situation.The improved SCR criterion could reduce the average number of iterations efficiently as well as assure the bit error rate performance at the low and high SNR situation.It accelerates the decoding process and improves the decoding efficiency.The performance is improved significantly especially at a lower SNR condition.
出处
《信息与电子工程》
2012年第2期188-191,共4页
information and electronic engineering
关键词
TURBO码
符号改变率停止准则
迭代译码
变门限
Turbo code
Sign Chance Ratio stopping criterion
iterative decoding
alterable limit