白噪聲發(fā)生器的設(shè)計(jì)

通信工程論文編號(hào):TX374  論文字?jǐn)?shù):11398,頁(yè)數(shù):34

目錄

摘要 I
ABSTRACT II
第1章 引言 1
 1.1 背景 1
 1.2研究?jī)?nèi)容 2
第2章 設(shè)計(jì)原理 3
 2.1 m序列原理 3
 2.2 m序列的性質(zhì) 4
 2.3 白噪聲發(fā)生器的總體設(shè)計(jì)框圖 6
第3章 白噪聲發(fā)生器軟件設(shè)計(jì) 7
 3.1 總體設(shè)計(jì) 7
 3.2 m序列的產(chǎn)生 7
 3.2.1 VHDL語(yǔ)言介紹 7
 3.2.2 m序列源程序 8
 3.3 系統(tǒng)仿真及分析 10
 3.3.1 MAX+PLUS II介紹 10
 3.3.2仿真波形及分析 13
第4章 白噪聲發(fā)生器的硬件設(shè)計(jì) 15
 4.1芯片簡(jiǎn)介 15
 4.2 原理圖設(shè)計(jì) 19
 4.3 焊接與調(diào)試 22
第5章 結(jié)論 27
致謝 28
參考文獻(xiàn) 29
附錄 源程序 30

摘要

 白噪聲是指功率譜密度在整個(gè)頻域內(nèi)均勻分布的噪聲，是一種在現(xiàn)實(shí)通信系統(tǒng)中普遍存在的噪聲信號(hào)。為了對(duì)通信系統(tǒng)的性能進(jìn)行準(zhǔn)確的測(cè)試和分析，技術(shù)人員需要一種能夠在實(shí)驗(yàn)室條件下模擬真實(shí)通信環(huán)境的裝置。白噪聲發(fā)生器正是應(yīng)此而生。
 本文通過(guò)對(duì)白噪聲產(chǎn)生原理的分析，提出了一種基于可編程邏輯器件實(shí)現(xiàn)偽隨機(jī)序列的方法，給出了硬件設(shè)計(jì)電路圖，VHDL的程序和m序列仿真波形。此實(shí)現(xiàn)方法具有硬件設(shè)計(jì)簡(jiǎn)單、成本低等優(yōu)點(diǎn)。同時(shí)由于CPLD有可重復(fù)編程的特點(diǎn)，可以對(duì)它進(jìn)行在線修改，便于設(shè)備的調(diào)試和運(yùn)行。

關(guān)鍵詞： 白噪聲，m序列，CPLD,VHDL語(yǔ)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