基于喷泉码的不等差错保护方案的研究

发布时间：2018-03-08 16:21

本文选题：喷泉码　切入点：度分布　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：信息传输质量与速度随着科学技术的发展引起了人们的高度重视。在传统传输机制中,反馈和自动重发传输效率低,增加了传输时间。喷泉码是一种无码率码,不需要反馈和自动重发请求,因此,节省了传输时间,避免了反馈风暴问题。本文从喷泉码影响因素入手,针对影响因素对喷泉码编译码的影响进行了详尽的研究,得出鲁棒孤波分布性能较优。在此基础上进行了喷泉码编译码方案的研究。针对现有编译码方案的不足,本文引入了混沌的概念,充分利用混沌映射产生的序列遍历性、均匀性等特点,给出了一种基于混沌映射的喷泉码编译码方案。仿真结果表明该方案的编译码结果具有较好的稳定性,并提高了译码成功率。其次,总结归纳了多种经典喷泉码不等差错保护(UEP)方案。经典的喷泉码UEP方案包括设置权重因子的UEP方案,基于扩展窗的喷泉码UEP方案以及采用复制窗方法实现的UEP方案。对这几种方案进行了仿真、分析,剖析出经典不等差错保护方案的特点。经典的不等差错保护方案有的牺牲了次重要数据的编译码成功率,有的不等差错保护特性不明显。在对仿真结果总结、分析的基础上,给出了一种基于复制窗—扩展窗的喷泉码不等差错保护方案。仿真结果表明此方案既增强了UEP特性,又改善了LIB的抗误码性能。
[Abstract]:With the development of science and technology, people attach great importance to the quality and speed of information transmission. In the traditional transmission mechanism, the transmission efficiency of feedback and automatic retransmission is low and the transmission time is increased. There is no need for feedback and automatic retransmission, so the transmission time is saved and the problem of feedback storm is avoided. It is concluded that the robust solitary wave distribution is better. Based on this, the coding and decoding schemes of fountain code are studied. In view of the shortcomings of the existing encoding and decoding schemes, the concept of chaos is introduced in this paper, which makes full use of the ergodicity of sequences generated by chaotic mapping. In this paper, a fountain code encoding and decoding scheme based on chaotic mapping is presented. The simulation results show that the scheme has good stability and improves the decoding success rate. Several classical fountain code unequal error protection schemes are summarized. The classical fountain code UEP scheme includes UEP scheme with weight factor. The UEP scheme of fountain code based on extended window and the UEP scheme realized by replicating window are simulated and analyzed. The characteristics of the classical unequal error protection scheme are analyzed. Some of the classical unequal error protection schemes sacrifice the success rate of encoding and decoding of the secondary important data, while some of the unequal error protection schemes are not obvious. A fountain code unequal error protection scheme based on replica window and extended window is presented. The simulation results show that this scheme not only enhances the characteristics of UEP, but also improves the error-resistant performance of LIB.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN911.22

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