LDPC码辅助设计系统的实现与应用

发布时间：2018-01-05 01:15

本文关键词：LDPC码辅助设计系统的实现与应用　出处：《华中科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：QC-LDPC码为LDPC码中的一种，由于其码结构的规律性，使得QC-LDPC码拥有低编码复杂度和低存储空间复杂度的性质，从而拥有更高的实用性。但是设计LDPC码需要大量的相关知识，需要码设计人员花费大量的时间去学习，而借助于LDPC码辅助设计系统可以大大减少其中的时间，这也是本文实现系统的目的所在。首先，我们对辅助设计系统进行了需求分析，确定系统的结构为B/S结构，同时由系统的结构和功能将系统划分为界面模块、数据通信模块、校验阵H生成模块、编码模块、信道仿真模块、解码模块和结果分析模块。其次，文章对系统中的各个模块进行了详细的分析设计与实现。其中设计了系统中LDPC码的校验阵H的结构为下三角类型，使得系统中LDPC码的编码时间复杂度为O(n)，同时由于其准循环的结构特点使得系统存储的空间复杂度也为O(n)。最后对系统进行了系统功能测试，测试结果表明系统可以对不同码长、码率的LDPC码进行码设计，并对设计的码进行性能的仿真，同时能够在仿真结果的基础上可以对LDPC码在码率上进行改进，给出不同码率下性能结果图以得出最佳码率，来达到改进原有码设计方案的目的。最后将该辅助设计系统在光盘存储和固态盘存储两个场景进行了应用，结果表明借助于该辅助设计系统，编码设计人员确实可以很便利的设计出相应的LDPC码，并对其LDPC码的性能有个初步的估计，，同时得到了同等条件下LDPC码可以达到的最佳码率，达到了设计该辅助设计系统的目的。
[Abstract]:QC-LDPC code is one of LDPC codes. Because of the regularity of its code structure, QC-LDPC code has the properties of low coding complexity and low storage space complexity. But the design of LDPC code requires a lot of relevant knowledge, and it takes a lot of time for the code designer to learn. With the aid of LDPC code aided design system, the time can be greatly reduced, which is the purpose of this system. First of all, we analyze the requirements of the aided design system and determine the structure of the system as B / S structure. At the same time, the system is divided into interface module and data communication module by the structure and function of the system. Check matrix H generation module, coding module, channel simulation module, decoding module and result analysis module. Secondly. In this paper, each module of the system is analyzed and implemented in detail, in which the structure of the check matrix H of the LDPC code in the system is of the type of lower triangle. It makes the encoding time complexity of LDPC code in the system to be O ~ (n). At the same time, due to the structure of the quasi-cycle, the space complexity of the system storage is also ONX. Finally, the system function is tested, and the test results show that the system can deal with different code lengths. The LDPC code at code rate is designed, and the performance of the designed code is simulated. At the same time, the LDPC code can be improved on the basis of the simulation results. In order to improve the original code design, the result diagram of performance under different bit rates is given to get the best code rate. Finally, the aided design system is applied in the two scenarios of optical disk storage and solid disk storage, and the results show that the aid of the system. Coding designers can easily design the corresponding LDPC code, and have a preliminary estimate of the performance of its LDPC code. At the same time, the optimal rate of LDPC code can be achieved under the same conditions. The purpose of designing the aided design system is achieved.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN911.2

【相似文献】