扩频通信中伪随机序列的研究与仿真

扩频通信中伪随机序列的研究与仿真(任务书,开题报告,外文翻译,论文15000字)
摘要
扩频通信是提高信息传输可靠性的一种特殊的通信方式，即把基带信号扩展到很宽的频率范围内来传递。伪随机码由于其良好的随机特性和易于产生复制等特点，广泛应用于扩频通信中的扩频码中。
本文主要的研究目的是扩频通信中伪随机序列的仿真与研究，主要研究了伪随机序列中的m序列、M序列和Gold序列的相关知识。详细论述了序列的产生、性质和相关特性，其中，m序列的相关性最好，Gold序列次之，但是在产生数量方面，m序列的数量要远远少于其它两个序列。因此，Gold序列等组合序列被广泛应用于码分多址等技术中。在仿真分析方面，本文主要通过Simulink仿真对三种序列进行了序列发生器的搭建，成功生成了三种码型发生器，并与标准码型发生器作为对比验证了码型的正确性。另外，用频谱仪测出三种码型的频谱特性，通过比较，得出m码的频谱特性优于其它两种码型的结论。
关键词：扩频通信；m序列；M序列；Gold序列；Simulink仿真
 
Abstract
Spread spectrum communication is a special way to improve the reliability of information transmission, that is, to extend the baseband signal to a wide frequency range for transmission. Pseudo-random codes are widely used in spread spectrum communication because of their good random characteristics and easy replication.
The main purpose of this paper is to simulate and study the pseudo-random sequence in spread spectrum communication. The knowledge of M sequence, M sequence and Gold sequence in pseudo-random sequence is mainly studied. The generation, properties and correlation characteristics of sequences are discussed in detail. Among them, m sequence has the best correlation, followed by Gold sequence, but in terms of the number of M sequence, the number of m sequence is far less than the other two sequences. Therefore, combination sequences such as Gold sequences are widely used in code division multiple access (CDMA) technology. In the aspect of simulation analysis, this paper mainly builds three sequence generators through Simulink simulation, and successfully generates three code generators, which are compared with standard code generators to verify the correctness of code types. In addition, the spectrum characteristics of three types of codes are measured by spectrum analyzer. By comparison, it is concluded that the spectrum characteristics of M code are superior to those of the other two types of codes.
Key words:Spread spectrum communication; m sequence; M sequence; Gold sequence ; Simulink simulation

目录
第1章 绪论    1
1.1 研究背景、目的和意义    1
1.2 研究现状、发展趋势及应用领域    2
1.3 论文研究内容和结构    3
第2章 伪随机序列的原理与特性    4
2.1 伪随机编码的基本概念    4
2.1.1 序列的相关函数    4
2.1.2 伪随机序列的定义与性质    5
2.1.3 线性反馈移位寄存器    6
2.2m序列    7
2.2.1m序列的产生    8
2.2.2m序列的性质    8
2.3 M序列    10
2.3.1 M序列的产生    10
2.3.2 M序列的性质    12
2.4 Gold序列    12
2.4.1 Gold序列的产生    12
2.4.2 Gold序列的性质    13
第3章 伪随机序列的仿真    15
3.1 m序列的仿真    15
3.1.1 仿真平台的搭建    16
3.1.2 运行结果分析    18
3.2 M序列的仿真    21
3.2.1 仿真平台的搭建    21
3.2.2 运行结果分析    21
3.3 Gold序列的仿真    23
3.3.1 仿真平台的搭建    23
3.3.2 运行结果分析    24
第4章 总结与展望    26
4.1 总结    26
4.2 展望    27
参考文献    28
致 谢    29