毕业设计（论文）-基于TTL门电路扩频码发生器仿真设计与电路实现精选.doc

摘 要 本毕业设计主要研究了三种扩频码（m序列，M序列和Gold序列）特性及其发生装置，并对其进行仿真和电路实现。扩频码是实现扩频系统的扩频运算的主要方式。从理论上讲，用纯随机序列来扩展信号的频谱是最理想的，但是接收端必须复制同一个随机序列，由于随机序列的不可复制性，因此在工程中，无法使用纯的随机序列，而改为采用为随机序列。在本论文中首先后分别种 关键字：扩频码；m序列；M序列；Gold序列  Abstract This graduation design is mainly studied the three kinds of spread spectrum code (m sequence, M sequence and Gold sequence) characteristics and generator, and carries on the simulation and circuit implementation. Spread spectrum code is the main way to realize spread spectrum system spread spectrum operations. Theoretically, with pure random sequence to extend the signal spectrum is the most ideal, but the receiver must replicate the same random sequence, as a result of random sequence is replication, therefore, in the project cant use pure random sequence, and instead used in random sequence. In this thesis, first of all, briefly expounds the research status quo of pseudo-random sequence and its related meaning, then introduces the development history of pseudo-random sequence, research methods and research tools. Then according to the requirements of project design three kinds of commonly used respectively pseudo-random sequence generator circuit and use Multisim circuit simulation, finally make a practical circuit and test, so as to complete the design of the generator. Key words: Spread spectrum code; m sequence; M sequence; Gold sequence  目 录 摘 要 I Abstract II 1 绪 论 1 1.1 课题研究意义及背景 1 1.2 国内外研究状况 2 1.3 扩频码发展历史 4 1.4 仿真工具Multisim简介 5 2 m序列伪随机码 7 2.1 伪随机码 7 2.1.1 伪随机码定义 7 2.1.2 伪随机码性质 7 2.2 m序列定义 8 2.3 m序列伪随机码的性质 8 2.3.1 平衡性 9 2.3.2 移位可加性 9 2.3.3 游程特性（游程分布的随机性） 9 2.3.4 自相关特性 9 2.4 m序列的产生方法 10 2.5 m序列仿真设计实现 12 3 M序列伪随机码 14 3.1 M序列定义 14 3.2 M序列随机码性质 14 3.2.1 M序列的随机特性 14 3.2.2 M序列相关特性 15 3.3 M序列的产生方法 15 3.4 M序列仿真设计实现 18 4 Gold序列伪随机码 22 4.1 Gold序列定义 22 4.2 m序列优选对 22 4.3 Gold序列伪随机码性质 22 4.3.1 平衡性 22 4.3.2 自相关特性 23 4.3.3 互相关特性 23 4.4 Gold序列产生方法 23 4.5 Gold序列仿真设计实现 24 5 硬件调试结果 26 结 论 29 致 谢 30 参考文献 31 附录A 英文原文 32 附录B 中文翻译 39 附录C 元器件表 50 绪 论 课题研究意义及背景 随着信息化社会进程的不断深