文档介绍：目录
摘要 (1)
1 绪论 (3)
(3)
LDPC发展动态 (5)
本论文的主要工作 (5)
2 LDPC码的原理 (5)
3 LDPC码校验矩阵构造 (6)
(7)
(9)
4 LDPC码的编码 (11)
(11)
LU分解 (11)
高斯消去 (12)
LDPC码的有效编码 (12)
5 LDPC码的译码 (14)
BP译码 (14)
降低复杂度的BP译码 (16)
6 运用MATLAB对LDPC码仿真 (20)
(20)
(20)
(21)
本章小结 (22)
结论 (22)
参考文献 (23)
致谢 (24)
基于MATLAB的LDPC码的仿真与研究
学生:
指导教师:
淮南师范学院电气信息工程学院
摘要:随着无线通信技术的发展和各种传输方式对可靠性要求的不断提高,信道编码作为抗干扰技术的重要手段之一,在数字通信技术领域和数字传输领域显示出越来越重要的作用。目前3G和4G无线通信系统的信道编码的主流技术是Turbo码,其具有接近香农极限的优异性能,但是在码长较长的情况下,其误码性能还有待于提高。LDPC码是一种线性分组码,和Turbo码同属于复合码类。两者的性能相近,且两者的译码延迟都很长,其适用一些实时性要求不是很高的通信。但是在码长较长的情况下,LDPC码比Turbo码的译码性能更高而且在误码率上,在硬件应用和应用方面LDPC具有更大的优点。本课题主要研究LDPC码在不同条件下的误码率,译码算法和应用上相比其他编解码技术的优点,为B3G和4G无线通信系统的信道编码提供理论依据。本论文所做工作如下:本文阐述了LDPC码的基本原理和分析LDPC码关键技术及影响性能的因素;对LDPC码进行编码在MATLAB软件的环境下进行仿真,在仿真的图像上进行性能的分析;运用仿真的图像对LDPC和Turbo在误码率上进行分析比较;在研究LDPC码基本理论的基础上,利用MATLAB仿真比较不同码长、列重和迭代次数对LDPC码性能的影响,为B3G和4G移动通信提供了有利的参考价值。
关键词:LDPC码; MATLAB;仿真
Research and Simulation of LDPC code Based on MATLAB
Student: Chen cheng
Teacher: Wang qian chun
Electronic And Information Engineering Department Of Huainan Normal University
Abstract:Along with the munication technology development and all kinds of transmission way to improve the reliability requirements, channel coding as one of the important
methods anti-interference technology in munication technology field and digital transmission field shows that more and more important role. Current 3 G and 4 G munication system of channel coding technology is the mainstream of Turbo yards, it has the close to shannon, the excellent properties of the limit, but in yards long long, its error performance needs improving. LDPC code is a linear space-time block codes, and Turbo yards with belong to pound of code. Both similar performance, and both decoding delay are very long, it is some real time requirement munication is not very high. But in the code l