基于UWB通信系统信道编解码的FPGA实现-通信与信息工程专业论文.docx

Classified Index: :
Dissertation for the Master Degree of Engineering
IMPLEMENTATION OF FPGA FOR CHANNEL CODING
BASED ON UWB SYSTEM
Candidate:
Ke Haiying
Supervisor:
. Xu Hongguang
Academic Degree Applied for:
Master of Engineering
Specialty:
Communication and Information system
Affiliation:
Shenzhen Graduate School
Date of Defence:
December, 2008
Degree-Conferring-Institution:
Harbin Institute of Technology
摘 要
由于通信信道固有的噪声和衰落特性,加上存储媒介的缺陷等原因,以及新的通信业务和信息业务的不断涌现,用户对信息传输的质量要求和速率要求不断提高。信道编码提高了信息传输的可靠性,但是常用的信道编码理论对于 UWB 系统还未有充分的探讨。
本课题研究的目的在于通过信道纠错码中的级联码仿真试验,为 UWB 信道纠错码提供试验和实践依据,为考察 UWB 通信系统的信道编码纠错能力提供参考依据。
本文通过在 QuartusII 软件上进行级联纠错码的编写和仿真,编写了级联码的编解码程序(卷积码+交织+RS 码),并加以仿真,测试了单独的 RS 码纠错能力和级联码纠错能力(卷积码+交织+RS 码),仿真和分析了二者之间的差距,给出实际 UWB 系统中级联纠错的方法。本文的研究内容主要包括以下几个方面:
(1) 采用横向对比方法,分析 UWB 系统和 DVB-T、DVB-D,建立系统
分析模型,并研究诸模型的异同。
(2) 研究卷积码,采用维特比 Viterbi 译码方法设计,纠随机错误能力, 满足了译码设备简单的需求。
(3) 通过设计交织和解交织,解决集群出错问题。
(4) 根据 RS 码特性,分析突发性错误纠错方法,给出 RS 码编译码方法。
本文中由实验和仿真得到的结论反映了信道编码中的级联纠错码的实际模型和应用特性,为信道纠错码在复杂 UWB 系统中的进一步应用提供了理论基础;RS 码与卷积码和交织技术并联组合的纠错方法对降低信道编码的错误率、提高纠错能力、满足通信需要具有一定的参考价值。
关键词信道纠错码;UWB;级联码;Quartus;FPGA
Abstract
As a result of the inherent noise and the fading feature, added to ings of the storage media, as well as the appearances of the munication service and new information business, clients require better more quality for information transmission service and transmission rate. The channel coding improves the reliability for the code transmission procedure, meanwhile the tranditional code theory provides inadequate study and evidence for the munication system.
This thesis aims at establishing an practical FEC model for hannel coding through experiments and simulations, supply a reliable basid for
UWB。
This thesis includes some basic contents, which contain the edition and simulation of the source code for the Cascade Code, to design the RS code, interleaver technology and convolution code separately, meanwhile simulate them,