突发信道中短码抗突发噪声信道编码算法的性能研究
发布时间：2019-02-19 16:52
【摘要】：为了减少信道中噪声对信号的干扰,提高通信系统的可靠性,信道编码是一个重要的技术手段。尤其在日趋复杂点电磁环境中,除了常规的加性高斯白噪声,突发噪声的出现使信道环境更加恶劣。因此对突发信道中信道编码技术的研究日益成为通信领域的研究热点之一。本文以突发信道中的短码编码为研究背景,比较不同编码算法的短码在突发信道和AWGN信道间的性能优异,研究对象分别是具有很强纠错能力的RS码和性能接近香农限的LDPC码。通过分析其编译码算法原理,对LDPC码的算法提出改进。使其于突发信道获得相对较好的性能提升。本文的主要工作包含以下几个方面:首先,论文研究了具有很强纠错能力的RS码编译码算法,通过搭建系统仿真平台,对RS短码编码在AWGN信道和突发信道进行系统仿真,分析其抗突发错误能力。接着,本文以LDPC码为研究手段,研究了LDPC线性编码、BP译码和多种LDPC码的构造方法。其中包括:Gallager的LDPC码构造方法、Mackay构造方法(Makcay_1A和Mackay_2A)、超轻矩阵构造方法(UL_A和UL_B)、PEG大围长构造方法、?旋转LDPC码的构造及其编码。同时对于LDPC线性编码算法中校验矩阵类下三角化的问题,分析了Greedy_A算法解决该问题存在的漏洞,并提出一种新的算法用于类下三角化校验矩阵。新算法弥补了Greedy_A算法存在的不足,且性能和稳定程度均优于Greedy_A算法。最后,本文介绍了一种抗突发噪声的Tanner图设计方法,以此构造具有抗突发噪声能力的LDPC码,阐述了构造大围长LDPC码的PEG算法原理。结合两种算法的特点,以PEG算法为基础进行改进,提出了一种兼顾大围长特性和抗突发噪声特性的LDPC码构造方式。并对其进行了系统仿真,分析了其作用机制和理论与仿真结果出现差距的原因。
[Abstract]:In order to reduce the interference of the noise to the signal and improve the reliability of the communication system, channel coding is an important technical means. Especially in the increasingly complex electromagnetic environment, in addition to the conventional additive Gao Si white noise, the emergence of sudden noise makes the channel environment worse. Therefore, the research of channel coding in burst channel has become one of the hotspots in communication field. In this paper, the short code coding in burst channel is taken as the research background, and the performance of short code with different coding algorithms is compared between burst channel and AWGN channel. The research objects are RS code with strong error-correcting ability and LDPC code with performance close to Shannon limit. By analyzing the principle of encoding and decoding algorithm, the improvement of LDPC code algorithm is put forward. It can improve the performance of burst channel relatively well. The main work of this paper includes the following aspects: firstly, this paper studies the RS codec algorithm with strong error-correcting ability. By building the system simulation platform, the RS short code coding is simulated in the AWGN channel and burst channel. The ability of resisting sudden error is analyzed. Then, the construction methods of LDPC linear coding, BP decoding and various LDPC codes are studied by means of LDPC codes. Including: Gallager's LDPC code construction method, Mackay construction method (Makcay_1A and Mackay_2A), ultra-light matrix construction method (UL_A and UL_B), PEG large girth construction method),? Construction and coding of rotating LDPC codes. At the same time, for the problem of triangulation of check matrix in LDPC linear coding algorithm, this paper analyzes the loophole of Greedy_A algorithm to solve this problem, and proposes a new algorithm for triangulation check matrix under class. The new algorithm makes up for the deficiency of Greedy_A algorithm, and its performance and stability are better than that of Greedy_A algorithm. Finally, this paper introduces a design method of Tanner diagram to resist burst noise, which is used to construct LDPC codes with the ability of resisting burst noise. The principle of PEG algorithm for constructing large girth LDPC codes is expounded. Combined with the characteristics of the two algorithms and improved on the basis of the PEG algorithm, this paper proposes a construction method of LDPC codes which takes into account the characteristics of large girth and anti-burst noise. The mechanism of the system and the reason of the gap between the theory and the simulation result are analyzed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.22
本文编号：2426682
[Abstract]:In order to reduce the interference of the noise to the signal and improve the reliability of the communication system, channel coding is an important technical means. Especially in the increasingly complex electromagnetic environment, in addition to the conventional additive Gao Si white noise, the emergence of sudden noise makes the channel environment worse. Therefore, the research of channel coding in burst channel has become one of the hotspots in communication field. In this paper, the short code coding in burst channel is taken as the research background, and the performance of short code with different coding algorithms is compared between burst channel and AWGN channel. The research objects are RS code with strong error-correcting ability and LDPC code with performance close to Shannon limit. By analyzing the principle of encoding and decoding algorithm, the improvement of LDPC code algorithm is put forward. It can improve the performance of burst channel relatively well. The main work of this paper includes the following aspects: firstly, this paper studies the RS codec algorithm with strong error-correcting ability. By building the system simulation platform, the RS short code coding is simulated in the AWGN channel and burst channel. The ability of resisting sudden error is analyzed. Then, the construction methods of LDPC linear coding, BP decoding and various LDPC codes are studied by means of LDPC codes. Including: Gallager's LDPC code construction method, Mackay construction method (Makcay_1A and Mackay_2A), ultra-light matrix construction method (UL_A and UL_B), PEG large girth construction method),? Construction and coding of rotating LDPC codes. At the same time, for the problem of triangulation of check matrix in LDPC linear coding algorithm, this paper analyzes the loophole of Greedy_A algorithm to solve this problem, and proposes a new algorithm for triangulation check matrix under class. The new algorithm makes up for the deficiency of Greedy_A algorithm, and its performance and stability are better than that of Greedy_A algorithm. Finally, this paper introduces a design method of Tanner diagram to resist burst noise, which is used to construct LDPC codes with the ability of resisting burst noise. The principle of PEG algorithm for constructing large girth LDPC codes is expounded. Combined with the characteristics of the two algorithms and improved on the basis of the PEG algorithm, this paper proposes a construction method of LDPC codes which takes into account the characteristics of large girth and anti-burst noise. The mechanism of the system and the reason of the gap between the theory and the simulation result are analyzed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.22
【参考文献】
相关博士学位论文 前1条
1 徐朝军;RS码译码算法及其实现的研究[D];西安电子科技大学;2006年
，本文编号：2426682
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