白噪声发生器的设计

论文编号:TX374  论文字数:11398,页数:34

摘要

 白噪声是指功率谱密度在整个频域内均匀分布的噪声，是一种在现实通信系统中普遍存在的噪声信号。为了对通信系统的性能进行准确的测试和分析，技术人员需要一种能够在实验室条件下模拟真实通信环境的装置。白噪声发生器正是应此而生。
 本文通过对白噪声产生原理的分析，提出了一种基于可编程逻辑器件实现伪随机序列的方法，给出了硬件设计电路图，VHDL的程序和m序列仿真波形。此实现方法具有硬件设计简单、成本低等优点。同时由于CPLD有可重复编程的特点，可以对它进行在线修改，便于设备的调试和运行。

关键词： 白噪声，m序列，CPLD,VHDL语言

ABSTRACT
 
 The white noise, which is refers to the power spectral density in the entire frequency range the uniform distribution noise, is a kind of the universal existence noise signal in the reality communications system. To carry on the accurate test and the analysis to communications system's performance，the technical personnel need  to be able to simulate the real environment of communication under the laboratory condition. White noise generator is to be born here.
 This article through the analysis of white noise principle Proposes to realize the pseudo-random sequence method based on the programmable logical component,which has given the hardware circuit diagram, VHDL language and m sequence simulation waveform. This method has the hardware design to achieve a simple and low cost.Because CPLD has the characteristic which can be Repeat programming and the online revision , is advantageous for equipment's debug and runing.
 Keywords: white noise, m sequence ,CPLD, VHDL language

目录

摘要 I
ABSTRACT II
第1章 引言 1
 1.1 背景 1
 1.2研究内容 2
第2章 设计原理 3
 2.1 m序列原理 3
 2.2 m序列的性质 4
 2.3 白噪声发生器的总体设计框图 6
第3章 白噪声发生器软件设计 7
 3.1 总体设计 7
 3.2 m序列的产生 7
 3.2.1 VHDL语言介绍 7
 3.2.2 m序列源程序 8
 3.3 系统仿真及分析 10
 3.3.1 MAX+PLUS II介绍 10
 3.3.2仿真波形及分析 13
第4章 白噪声发生器的硬件设计 15
 4.1芯片简介 15
 4.2 原理图设计 19
 4.3 焊接与调试 22
第5章 结论 27
致谢 28
参考文献 29
附录 源程序 30