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基于Chase算法的Turbo乘积码解码算法研究与应用.pdf


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基于Chase算法的Turbo乘积码解码算法研究与应用.pdf
文档介绍:
摘要
移动通信技术发展至今,数据信息传输的可靠性和高效性一直是研究的热点
问题,能在低功耗情况下保持信息高速正确的传输是通信系统的主要目标,而信
道编解码技术可以有效的解决这些问题。 Turbo 乘积码作为一种新型的纠错编码
方法,继承了 Turbo 码良好纠错性能的优点,而且 Turbo 乘积码采用线性分组码来
构造,译码方法比 Turbo 码简单,编码效率高。近年来成为信道编码领域研究的
热点,有着广泛的应用前景。
本文首先介绍了通信系统模型和信道编码发展,接着围绕 Turbo 乘积码的编
码原理介绍了 Turbo 乘积码的编码结构,子码选择和应用领域。然后重点分析了
Turbo 乘积码基于 Chase 算法的软输入软输出译码算法,详细阐述了译码原理和实
现步骤,仿真分析了影响译码性能的各个因素。
最后,介绍了一种特殊结构的 Turbo 乘积码,其采用似汉明码作为子码,接
着介绍了基于 Chase 算法的译码实现,并从降低译码复杂度和节约硬件资源开销
出发,提出了改进型的 Chase 算法。此 Turbo 乘积码在误码率在10−6 情况下,定点
仿真时获得了 7.2dB 的编码增益,本论文的研究成果可以为高速率数据传输系统
提供应用参考。
关键词: Turbo 乘积码,BCH 码, Chase 算法,编码增益
ABSTRACT
With the development of mobile communication technology, the reliability and
efficiency of information transmission have remained an attractive research topic, and
the main objective of high speed communication system is to maintain the correct
transmission at low power consumption, thus the channel coding can effectively solve
this problem. Turbo product code is a new type of error correction coding and it
inherited the powerful performance of Turbo code, because Turbo product code been
constructed by the linear block codes, its iterative decoding is traditionally performed
using several decoders whose computational complexity can be considerable. In recent
years, research in the field of turbo product code becomes hotspot and its applications
have broad prospects.
This paper describes the digital communication system model and the
development of channel coding firstly, and then introduce TPC encoding structure,
sub-code selection and application areas. Secondly, the analysis of soft-input
soft-output decoding algorithm based on Chase algorithm is provided and the detailed
implementation procedure is proposed, as well as the simulation analysis of the various
factors that affect the decoding performance provi
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