光纤通信中前向纠错技术的研究(任务书,开题报告,论文说明书12000字)
摘 要
一个通信系统必须满足效率高以及可靠性高，这样才可以使得信息在信道中传输的快速及准确，然而速度快与准确性高在通信系统中往往是不可兼得的。如果要求是快速的，每个数据码的时间缩短，波形则会变小，能量同样也会减少，错误的概率增加，传输信息的可靠性降低。如果要求是可靠的，那么信息传送时的速度就会降低。近几年来，由于人们对生活质量的要求不断提高，使得由高速发展的光纤通信网络所产生的高效和可靠的数据传输业务应运而生。在远程通信、信息论、编码理论中，前向纠错码（FEC）和信道编码是在不可靠或强噪声干扰的信道中传输数据时用来控制错误的一项技术，前向纠错编码可以检测并纠错传输时产生的误码，而这得益于它吸收了级联信道编码这一类的编码技术的相关特点。在光纤通信系统中前向纠错技术已得到了广泛的关注与研发，原因就是可以花费很小的代价，即在信道中加入冗余码，就可以提高与增强系统的误码率性能，同时纠正误码。
本文主要研究光纤通信中的前向纠错技术，第一章是概述部分，主要介绍了光纤通信系统以及其相关研究现状，第二章论述了适合光纤通信系统的码型和它们的特点，接下来第三章为本文重点，介绍了前项纠错技术还有EFEC和SFEC两种扩展技术，为后面的部分打下了理论基础，最后一章为前向纠错、增强型前向纠错、超强型前向纠错的仿真，采用的主要步骤是在MATlAB仿真软件中输入一组图像，进行灰度变换并使用bitxor函数进行异或产生纠错针，比较经过纠错技术处理的图像和没有进过纠错技术处理的图像不同。
关键词：FEC EFEC SFEC MATLAB
ABSTRACT
The purpose of communication is to send messages to each other in a timely and reliable manner. Therefore, it is necessary to have a reliable and fast transmission message in a digital communication system. If the requirement is rapid, the time of each data code is shortened, the waveform becomes narrow, the energy is reduced, and the probability of error is increased, and the reliability of the transmission message is reduced. If the requirement is reliable, the rate of the transmitted message becomes slower. At present, optical fiber communication network is entering a period of rapid development, people need a variety of efficient and reliable data transmission services. In telecommunication, information theory, coding theory, former to error correcting codes (FEC) and channel coding is for data transmission in unreliable or strong noise channel used to control error of a technology, former to error correction coding (FEC) has introduced characteristics of concatenated channel coding and coding gain technology can automatically correct the error transmission has the advantages. Before forward error correction (FEC) technology currently has been widely used in optical communication system, in order to pass in the signal join a small amount of redundant information to find and correct errors, so as to improve the BER performance of the system, improving the reliability of the system communication, reduce the system cost.
This paper mainly studies the optical fiber communication of FEC, the first chapter is the introduction part, mainly introduces the optical fiber communication system and its related research, the second chapter discusses the code type for optical communication systems and their characteristics, the third chapter is the focus of this paper, introduces the error correction technology and EFEC and SFEC two extension technology, a theoretical foundation for the later part, the last chapter is the FEC, enhanced FEC, super FEC simulation, the main steps of an input image is used in the MATlAB simulation software, and generates an error correction using the bitxor function XOR needle gray-scale transformation, comparison after image processing and image correction technology in error correction technology of different treatment.
Key words: EFEC SFEC MATLAB FEC
目 录
摘 要 II
ABSTRACT III
目 录 IV
1.绪 论 1
1.1研究背景和意义 1
1.2国内外研究现状 1
1.2.1光纤通信系统的研究现状 2
1.2.2前向纠错技术的研究现状 2
2. 光纤通信里的编码技术 3
2.1汉明码 3
2.2 循环码 3
2.2.1循环码的概述及特点 4
2.2.2循环码的多项式表示 5
2.2.3(n,k)循环码的生成多项式 6
2.2.4循环码的编码原理 6
2.3 BCH码 7
2.4 RS码 7
2.4.1 RS码的编码原理 8
2.4.2 RS码的译码原理 9
2.4.3 RS码的纠错能力 9
3.FEC（前向纠错技术）及在光纤通信中的实现与扩展 10
3.1前向纠错技术概述及实现 10
3.2前向纠错技术的分类 11
3.2.1 带内FEC 12
3.2.2 总结 13
3.3 FEC技术的扩展：EFEC和SFEC 16
3.3.1EFEC（增强型前向纠错技术） 18
3.3.2 SFEC（超强型前向纠错技术） 19
4.仿真结果与分析 20
4.1.仿真步骤论述 21
4.2仿真结果.. .. .......................................................22
4.3仿真结果分析.........................................................22
参考文献 23
致谢 24 |
