毕业设计（论文）-UWB通信系统的TH-PPM信号产生与接收研究.doc

2014 届毕业设计说明书

UWB通信系统的TH-PPM信号产生与接收
研究
院、部: 电气与信息工程
学生姓名:
指导教师: 职称实验师
专业: 电子信息工程
班级: 电子1002班
完成时间: 2014年5月28日
摘要
UWB超宽带技术是近年来在国际上兴起的最超前的无线通信技术,它被看作是无线电技术的的一个巨大的历史性变革。超宽带无线通信是一种不需要使用载波的通信方式,它只要采取持续时间极短的纳秒级(甚至比1ns还小)脉冲就可以进行通信,它也被称为时域通信(Time Domain)、脉冲无线电(Impulse Radio)或者是无载波(Carrier free)。正常的通讯系统经过发送射频载波对信号进行调制,但UWB通信系统则例外,它没有选用发射载波,却是通过利用持续时间极短(甚至达到纳秒级)的窄脉冲方式来传输数据,并且数据传输速率能够超过几百Mbps。与传统的载波调制通信形式比拟具备抗多径衰落、功耗小、成本低等许多方面的优点。
本题目重要研究了超宽带通信系统的TH-PPM信号的产生与接收,介绍了UWB通信系统的基础、信道模型、TH-PPM信号的产生方法及发射机计划、TH-PPM信号的接收方法而且特别提出了RAKE接收机。在文章的最后一部分,对TH-PPM信号系统整体仿真和分析,仿真用的是MATLAB中的simulink。同时,也简单了介绍了一下simulink的特点。
其实,在本文选取仿真软件时,有两种选择,FPGA和MATLAB。但是对于FPGA不是太熟,所以选择了MATLAB。
关键字:超宽带;RAKE接收机;TH-PPM
ABSTRACT
UWB is the most advanced munication technology in the recent years in the world and it is realized as a great revolutionary evolevnt of wireless munication municate with the signal which is a very short pulse and does not need carrier is also called Impulse Radio,Carrier free and Time domain system modulate signal by sending a radio frequency carrier municational system which does not use carrier,but the very short duration form of narrow pulse transmission the velocity of data transmission can reach more than several hundred megabits per pared with the traditional carrier munication mode ,it has so many advantages .For example ,we can realize it,olny spending little , low consumption and resistance to multipath fading are also its distinctive aspect.
The subject mainly researches the munication system production of TH-PPM signal and it also introduces the munication system,channel model,TH-PPM signal generation method and transmitter scheme,TH-PPM signal receiving method and the RAKE reciver is specially the end of the article,I simulate and analyse TH-PPM signal I use simulink in MATLAB to simulate the whole the same time,I introduce the chara