基于AT89S52的FSK調(diào)制解調(diào)器設(shè)計

通信工程論文編號:TX382  論文字?jǐn)?shù):14064,頁數(shù):45

目錄

摘要 I
ABSTRACT II
第1章 引言 1
 1.1 背景 1
 1.2 研究內(nèi)容 2
第2章 系統(tǒng)分析及設(shè)計總體方案 3
 2.1 調(diào)制解調(diào)器概述 3
 2.2 系統(tǒng)總體規(guī)劃 3
 2.3 系統(tǒng)設(shè)計思路 4
 2.4 系統(tǒng)特點 5
第3章 電路的設(shè)計與實現(xiàn) 6
 3.1 設(shè)計概述 6
 3.2 串口通信電路 7
 3.2.1 RS232簡介 7
 3.2.2 MAX232簡介 8
 3.2.3 8051單片器UART簡介 8
 3.2.4電路設(shè)計及仿真 9
 3.3 調(diào)制電路 10
 3.3.1 AT89S52簡介 10
 3.3.2 調(diào)制算法簡介 11
 3.3.3 調(diào)制程序簡介 12
 3.4 D/A轉(zhuǎn)換電路 13
 3.4.1 DAC0832簡介 13
 3.4.2 電路設(shè)計及仿真 16
 3.5 低通濾波電路 17
 3.5.1 電路設(shè)計及仿真 17
 3.6 整形運放電路 19
 3.6.1 TL084簡介 19
 3.6.2 穩(wěn)壓二極管簡介 19
 3.6.3 電路設(shè)計及仿真 20
 3.7 解調(diào)電路 21
 3.7.1 AT89S52單片機(jī)定時/計數(shù)器2簡介 21
 3.7.2 解調(diào)程序簡介 22
第4章 實際電路焊接和調(diào)試 24
 4.1 概述 24
 4.2 串口通信電路調(diào)試 24
 4.3 D/A轉(zhuǎn)換電路調(diào)試 25
 4.4 濾波電路調(diào)試 25
 4.5 調(diào)制電路調(diào)試 26
 4.5.1 調(diào)制電路基本調(diào)試 27
 4.5.2 特定信號調(diào)制輸出測試 27
 4.6 整形運放電路調(diào)試 29
第5章 結(jié)束語 30
致謝 31
參考文獻(xiàn) 32
附錄A 調(diào)制源代碼 33
附錄B 解調(diào)源代碼 36
附錄C 原理圖 40
附錄D 實物圖 41

摘要

 基于FSK調(diào)制方式的通信系統(tǒng)具有調(diào)頻信號容易產(chǎn)生，系統(tǒng)設(shè)備相對簡單，而且抗干擾能力優(yōu)秀的特點。同時基于MCS-51系列單片機(jī)的系統(tǒng)設(shè)計具有電路結(jié)構(gòu)簡單，性能穩(wěn)定，研究成本低等優(yōu)點。本文介紹了一種基于AT89S52實現(xiàn)FSK調(diào)制解調(diào)器的設(shè)計方法，該系統(tǒng)由FSK調(diào)制器、解調(diào)器、串口通信電路、D/A轉(zhuǎn)換電路，低通濾波器以及整形電路組成。軟件設(shè)計在Keil中完成，硬件仿真在Proteus和Multisim中完成。最終在通用板上完成了硬件調(diào)試，驗證了設(shè)計的可行性。

關(guān)鍵詞：MCS-51，F(xiàn)SK，調(diào)制，解調(diào)

ABSTRACT

 It is apt to produce frequency modulation signals of FSK communication system. The system equipment is simple. It owns an outstading characteristic of anti-interference. The system based on MCS-51 Microcontroller has simple circuit, structure stable performance and low research cost. This article describes the implementation based on AT89S52 FSK modem design. The system consists of FSK modulator, demodulator, serial communication circuit, D/Aconverter circuit, low pass filter, and waveformshaping circuit is completed in the Keil software design, hardware simu- lation completed in Proteus and Multisim. The system is finally tested on a general board and its design feasibility is also verified.

 Keywords: MCS-51, FSK, Modulation, Demodulation