新型3D-Turbo码原理分析与性能研究

姚如贵¹, 高凡琪¹, 张昆¹, 徐娟²

(1. 西北工业大学 电子信息学院, 710072 西安; 2. 长安大学 电控学院, 710064 西安)



摘要:

为改善中高信噪比下传统Turbo的错误平台性能,介绍一种改进的Turbo码(3D-Turbo Codes),通过增加一个码率为1的后编码器,对传统Turbo编码器得到的部分校验比特进行后编码． 给出3D-Turbo码的编码结构,分析了影响性能的主要因素,研究3D-Turbo码的迭代译码过程并详细推导了Max-Log-Map算法,最后对3GPP2标准下的3D-Turbo码性能进行仿真． 研究结果表明,与3GPP2 Turbo码相比,3D-Turbo码通过增加很小的复杂度,可以有效改善错误平台性能．因此,在中高信噪比且对误码率要求严格的场景下,3D-Turbo码有广阔的应用空间．

关键词:  3D-Turbo码  3GPP2  错误平台  收敛特性

DOI：10.11918/j.issn.0367-6234.2014.11.016

分类号:TN911.2

基金项目:国家高技术研究发展计划(2012AA120604);航天支撑基金(2013-HT-XGD);西北工业大学基础研究基金(JCY20130132).



Theoretical analysis and performance study of 3-dimension Turbo codes

YAO Rugui¹, GAO Fanqi¹, ZHANG Kun¹, XU Juan²

(1. School of Electronics and Information, Northwestern Polytechnical University, 710072 Xi′an, China; 2. School of Electronic and Control Engineering, Chang'an University, 710064 Xi′an, China)

Abstract:

In order to prevent high error floor of classic Turbo at middle and high SNRs, a modified Turbo codes, named as 3D-Turbo codes, is proposed in which some of the parity bits from the classical encoders are further encoded by a rate-1 post encoder. The encoder structure of 3D-Turbo Codes is introduced and analysis of main factors affecting performance is provided, then the iterative decoding process and detailed derivation of the Max-Log-Map algorithm of 3D-Turbo Codes is presented, performance based on 3GPP2 standards is simulated. The theoretical analysis and results show that 3D-Turbo Codes have lower error floor compared to 3GPP2 Turbo Codes, at the expense of a very small increase in complexity. Therefore, under middle or high SNRs and strict BER requirement, 3D-Turbo Codes are expected to have extensive application prospects.

Key words:  3D-Turbo Codes  3GPP2  error floor  convergence performance