摘要: |
以Turbo码基本理论和算法为基础,依据无线信息传输的实际要求和Taylor级数的基
本原理,提出了一种Turbo码的Taylor-Log-MAP高效译码算法。该算法对基本的Log-MAP
算法中K运算利用Taylor级数进行展开,针对实际的信道需求对展开式进行截断,实现了Tur
bo码
的最佳译码。与传统的对数域最大后验概率译码算法相比,该算法基本保持了优良的译码
性能,同时避免了复杂的对数运算,减小了运算量。仿真结果表明,与现
有的RS码性能相比,使用Turbo码可以获取5 dB的信噪比增益。 |
关键词: 战术数据链 Turbo码 Taylor定理 最大后验概率译码 误码
率 |
DOI: |
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基金项目:国家高技术研究发展计划(863计划) 项目(2010AAJ145);国家
自然科学基金资助项目(60802053);陕西省电子信息系统综合集成重点实验室基金项目(2
01102Y05);空军工程大学电讯工程学院科研创新项目(DYCX1040, DYCX1007);空军工程大学
研究生创新基金项目(20110301) |
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A Taylor-Log_MAP decoding algorithm for Turbo codes |
LI Si-jia,MAO Yu-quan,ZHENG Qiu-rong,ZHANG Jian-an,LI Bo |
(Telecommunications Engineering Institute, Air Force Engineering Uuniversity, Xi
′an 710077,China) |
Abstract: |
Based on the theory and architecture of Turbo codes, an efficient new
decoding algorithm is designed according to the requirement of communication and
the Taylor series. The function is transformed through the Taylor series expans
ion and truncated according to the demand for wireless communication. Compared w
ith the Log-MAP decoding algorithm, the new algorithm a
voids complex operation. Simulation result shows the proposed algorithm keeps e
xcellent decoding perfo
rmance and the Taylor-Log-MAP decoding algorithm can bring 5dB SNR(Signal-to-
Noise Ratio) gain compared with the RS codes. |
Key words: tactical digital information link Turbo codes Taylor
theorem MAP decoding bit error rate |