直序扩频技术的仿真与应用

文档编号:TX407  文档字数:14521,页数:37 附开题报告，中文献综述，外文翻译

摘  要
 扩展频谱通信，它与光纤通信、卫星通信，一同被誉为进入信息时代的三大高技术通信传输方式。
 在本文中主要研究了扩频通信中的直序扩频通信。直序扩频技术是目前使用比较广泛的一种扩频技术，由于它在发送端用扩频码序列进行扩频调制，在接收端用相关解调技术，使其具有许多窄带通信难于替代的优良性能。
 本文主要阐述了直序扩频技术的基本原理以及实现扩频的关键技术——伪随机序列，并叙述了伪随机序列的产生、性质，讲述了直序扩频的调制与解调，同时研究了在Systemview系统下的仿真实现，以及它的未来发展趋势。
关键词　直序扩频； 伪随机序列
ABSTRACT
 Expand the frequency chart correspondence ( Spread Spectrum Communication), fiber optic Communication the and satellite Communication are three advanced transfer mode in communication in the information age
 Studied the keeping of Spread Spectrum correspondence inside preface Spread Spectrum correspondence primarily in this text.Keeping the preface Spread Spectrum technique is good function that more extensive a kind of Spread Spectrum technique in current usage, because of it is sending out to carry to proceed with the Spread Spectrum code preface row the Spread Spectrum makes, at receive to carry to use related the solution adjusts the technique, making its have many narrow take the correspondence difficult in act for.
 This text expatiates to keep the technical and basic principle in Spread Spectrum in preface and realizes the key technique —— of the Spread Spectrum primarily false with machine preface row, and describe false with the creation, kind of the machine preface row, related to keep the preface Spread Spectrum make with solve to adjust, undering the system of Systemview studied at the same time of imitate true now, and it of future development trend.

Keyword: Direct sequence spread spectrum，PN sequence

 目  录
中文摘要...................................................Ⅲ
英文摘要...................................................Ⅲ
引言........................................................1
1直序扩频概述
1.1 现代通信的安全需要......................................2
1.2 直序扩频的发展历史......................................2
1.3 本文的主要内容和工作......................................2
2直序扩频的基本理论和概念
2.1扩展频谱通信概述.........................................3
2.2直序扩频通信概述 .........................................5
2.3直序扩频信号的发送与接收...................................6
2.4直序扩频系统的性能.......................................8
2.5直序扩频在工程中的实际应用...............................10
3 PN码的产生
3.1扩频码序列..............................................11
3.2 m序列..................................................13
4 基与Systemview 的直序扩频系统的仿真与实现
4.1 Systemview仿真系统概述..................................17
4.2直序扩频系统仿真.........................................19
4.3 MSK与PSK仿真对比.......................................28
5 扩频技术的总结与展望
5.1工作总结.................................................29
5.2扩频技术的发展趋势.......................................29
5.3超宽带技术................................................29
5.4多载波调制技术...........................................29
5.5软件无线电.............................................. .30
结论........................................................31
致谢 .......................................................32
参考文献......................................................33

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