基于校验方程平均符合度的Turbo码交织器估计  

Estimation of Turbo-Code Interleaver Based on Average Conformity of Parity-Check Equation

作　　者：刘骏[1] 李静[1] 彭华[1] 

机构地区：[1]解放军信息工程大学,河南郑州450002

出　　处：《电子学报》2016年第5期1213-1218,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61072046)

摘　　要：现有的交织器估计方法通常利用解调输出的硬判决序列进行,其容错能力有待提高,且一些方法只针对特定的交织器结构.针对Turbo码的随机交织器,提出一种利用接收软判决序列进行估计的算法.首先提出校验方程平均符合度的概念及计算方法,然后利用正确交织位置的码字可使得校验方程符合度取到最大值这一事实,逐步实现交织位置的估计.特别地,所提算法在删余条件下仍然有效.仿真结果表明,与现有的相关方法对比,特别是在低信噪比条件下,本文算法具有更好的性能以及相对低的复杂度.The existing methods for interleaver estimation usually use hard-decision of the demodulator output se- quence, their robustness against error bits is to be improved and some methods only aim at certain interleavers. Focusing on the random interleaver of Turbo codes, this paper presents an estimation algorithm which uses soft-decision. Firstly, the con- cept and calculation method of the average conformity of parity-check equation are given. Then, the permutation positions of the interleaver are estimated step by step, using the truth that the correct permutation position could maximize the average conformity of parity-check equation. Especially, the proposed algorithm still performs well in puncturing case. Results of sim- ulation experiments show that our algorithm has better performance and relatively lower complexity, especially in low signal- to-noise ratio cases, compared to the existing relevant algorithms.

关 键 词：TURBO码交织器 软判决 低信噪比 校验方程平均符合度 

分 类 号：TN911.7[电子电信—通信与信息系统]