QAM傳輸系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)

[摘 要]正交振幅調(diào)制QAM是一種相位和振幅聯(lián)合控制的數(shù)字調(diào)制技術(shù)。它應(yīng)用范圍非常廣泛，不僅在移動(dòng)通信領(lǐng)域而且在有線電視傳輸、數(shù)字視頻廣播、衛(wèi)星通信等領(lǐng)域都得到廣泛應(yīng)用。本文深入研究QAM調(diào)制解調(diào)的基本原理、系統(tǒng)結(jié)構(gòu)及性能參數(shù)，實(shí)現(xiàn)QAM調(diào)制解調(diào)系統(tǒng)的Simulink仿真及性能分析；詳細(xì)分析模擬信號(hào)數(shù)字化的基本理論及實(shí)現(xiàn)方法，實(shí)現(xiàn)差分脈碼調(diào)制的Simulink仿真及性能比對(duì)；基于上述理論構(gòu)建模擬信源QAM傳輸系統(tǒng)，并利用Matlab/Simulink進(jìn)行建模仿真及性能驗(yàn)證。仿真結(jié)果表明，所構(gòu)建的QAM數(shù)字傳輸系統(tǒng)可以實(shí)現(xiàn)模擬信號(hào)良好的傳輸。
[關(guān) 鍵 詞] 數(shù)字傳輸；正交振幅調(diào)制；差分脈碼調(diào)制；建模仿真


Design and Simulation of QAM System
Communcation Engineering Major Lin Long

Abstract : Quadrature amplitude modulation is a joint-controlled digital modulation technology of phase and amplitude. It is widely used not only in the mobile communication field, but also in other fields, such as wire television transmission field, digital video broadcasting, satellite communication, etc... This paper studies the basic principles of QAM modulation and demodulation, then simulates the whole 16QAM system and discusses performances of system by the simulink toolbox. This paper also analyses the basic principles and implementation method on digitalizing analog signals, then simulates the DPCM system and contrasts performances of system. At last, this paper designs a QAM transmission system of analog sources, then simulates the whole transmission system and comparing performances of system. The simulation shows analog signals can be transmitted correctly in the system designed in this paper.
Key words: digital transmission; quadrature amplitude modulation; differential pulse code modulation; model and simulate
目 錄
1引言 1
1.1 課題研究背景及意義 1
1.1.1 調(diào)制在通信系統(tǒng)中的作用 1
1.1.2 數(shù)字調(diào)制解調(diào)技術(shù)現(xiàn)狀與發(fā)展 2
1.2 QAM調(diào)制解調(diào)技術(shù)在數(shù)字通信領(lǐng)域的應(yīng)用優(yōu)勢(shì)
1.3 仿真軟件介紹
1.4 論文主要內(nèi)容及結(jié)構(gòu)安排
2 QAM調(diào)制解調(diào)技術(shù)研究及Simulink仿真
2.1 QAM調(diào)制
2.1.1 QAM調(diào)制原理
2.1.2 QAM調(diào)制性能
2.1.3 QAM星座圖
2.2 QAM解調(diào)
2.3 QAM調(diào)制解調(diào)系統(tǒng)的Simulink仿真
2.3.1 16QAM調(diào)制解調(diào)系統(tǒng)的Simulink仿真
2.3.2 64QAM調(diào)制解調(diào)系統(tǒng)的Simulink仿真
2.4 MQAM調(diào)制解調(diào)系統(tǒng)性能仿真分析
2.4.1頻帶利用率分析
2.4.2 誤碼率分析
2.4.3 功率利用率分析
2.5 本章小結(jié)
3模擬信號(hào)數(shù)字化研究及Simulink仿真
3.1 脈沖編碼調(diào)制
3.2 差分脈沖編碼調(diào)制
3.2.1 DPCM編解碼基本原理
3.2.2 最佳預(yù)測(cè)器
3.2.3 DPCM的系統(tǒng)性能分析
3.3 DPCM的Simulink仿真
3.4 信道誤碼對(duì)語(yǔ)音質(zhì)量影響的仿真分析
3.4.1 最佳預(yù)測(cè)器抽頭系數(shù)的確定
3.4.2 構(gòu)建測(cè)試模型及仿真
3.4.3 與PCM話音解碼對(duì)比分析
3.5本章小結(jié)
4 QAM傳輸系統(tǒng)的構(gòu)建與仿真
4.1 構(gòu)建QAM傳輸系統(tǒng)
4.1.1 模擬信源數(shù)字通信系統(tǒng)模型
4.1.2 QAM傳輸系統(tǒng)的模型
4.2 QAM傳輸系統(tǒng)的仿真
4.3 應(yīng)用實(shí)例的仿真
4.4本章小結(jié)
結(jié)論及尚存在的問(wèn)題
參考文獻(xiàn)
致謝