【正文】 數(shù)據(jù)及多媒體等在內(nèi)的多種業(yè)務(wù)技術(shù)仍然是移動通信技術(shù)發(fā)展的主要方向。從那時起，移動通信的發(fā)展大體可分為三代，即模擬移動通信系統(tǒng)、數(shù)字移動通信系統(tǒng)和現(xiàn)代移動通信系統(tǒng)。與之對應(yīng)，人們對通信業(yè)務(wù)有了更高層次和更高質(zhì)量的要求，這對通信業(yè)務(wù)的容量產(chǎn)生了巨大的沖擊，同時對通信網(wǎng)傳遞信息的能力提出了更高的要求。關(guān)鍵詞：CDMA，通信原理，系統(tǒng)仿真，matlab西北工業(yè)大學(xué)明德學(xué)院本科畢業(yè)設(shè)計論文IIABSTRACT CDMA technology is based on the principle of spread spectrum technology, will need to transfer information and data with a certain bandwidth, the bandwidth is much larger than the information with a highspeed bandwidth, modulated pseudorandom code, and then sent by the carrier modulation. MATLAB simulation software for the use modulation of CDMA munication system simulation, the baseband signal sources and the adoption of modulation of CDMA munication system to receive the frequency diagram. Simulation results show that in the absence of background noise, at thereceiving end be able to restore the integrity of the input signal. CDMA munication system proves the correctness of simulation this paper, CDMA munication systems principle part of the research, including systems theory model, it is estimated part of mathematic model simulation.KEY WORDS：CDMA ，conmmunication principle，system simulation，matlab西北工業(yè)大學(xué)明德學(xué)院本科畢業(yè)設(shè)計論文1第一章 緒 論 移動通信系統(tǒng)的發(fā)展概況 隨著信息的高速發(fā)展，人類社會進入了一個前所未有的信息量急劇增長的信息時代。證明了 CDMA 通信系統(tǒng)仿真模型的正確性。 利用 MATLAB 仿真軟件對 CDMA 通信中調(diào)制系統(tǒng)進行仿真，得到基帶信號源與通過 CDMA 調(diào)制系統(tǒng)的接收信號的頻譜圖。 本科畢業(yè)設(shè)計論文題 目 CDMA 通信原理及系統(tǒng)仿真 _ 專業(yè)名稱 通信工程 學(xué)生姓名 王豐雷 指導(dǎo)教師 王魯杰 畢業(yè)時間 2022 年 7 月 西北工業(yè)大學(xué)明德學(xué)院本科畢業(yè)設(shè)計論文目 錄摘 要 ..............................................................................................................................IABSTRACT.................................................................................................................II第一章 緒 論 ........................................................................................................1 移動通信系統(tǒng)的發(fā)展概況 .......................................................................................................1 模擬移動通信系統(tǒng)（1G） ....................................................................................................1 數(shù)字移動通信系統(tǒng)（2G） ....................................................................................................2 現(xiàn)代移動通信系統(tǒng)（3G） ....................................................................................................2 CDMA 技術(shù)國內(nèi)外發(fā)展狀況 ......................................................................................................2 CDMA 系統(tǒng)的特點與優(yōu)勢 .............................................................................................................3 移動通信系統(tǒng)的多址方式 ...................................................................................................3 CDMA 多址技術(shù)的優(yōu)點 ..........................................................................................................4 本文的主要內(nèi)容安排 ....................................................................................................................5第二章 基本理論分析 ................................................................................................7 CDMA 技術(shù)基礎(chǔ) ..........................................................................................................................7 CDMA 技術(shù)基本原理 ..........................................................................................................7 擴頻通信系統(tǒng) .......................................................................................................................7 CDMA 碼序列 ....................................................................................................................10 卷積編碼、塊交織 .............................................................................................................10 CDMA 系統(tǒng)的物理層技術(shù) ........................................................................................................14 CDMA2022 物理層 ............................................................................................................14 WCDMA 物理層 ................................................................................................................16 TDSCDMA 系統(tǒng)的物理層 ...............................................................................................17 本章小結(jié) .....................................................................................................................................17第三章 CDMA 在不同訓(xùn)練序列下的調(diào)制解調(diào)過程 ............................................19 調(diào)制解調(diào)的概念 .........................................................................................................................19 CDMA 信道調(diào)制 ........................................................................................................................22 反向信道調(diào)制 .....................................................................................................................22西北工業(yè)大學(xué)明德學(xué)院本科畢業(yè)設(shè)計論文 前向信道的調(diào)制 .................................................................................................................23 CDMA 系統(tǒng)干擾分析 ........................................................................................................24 本章小結(jié) .......................................................................................................................................26第四章 CDMA 通信系統(tǒng)中基于 SIMULINK 的系統(tǒng)仿真 ..................................27 SIMULINK 簡介 ...............................................................................................27 典型的模型結(jié)構(gòu) ...................................................................................................................28 Simulink 仿真過程 .............................................................................................................28 QPSK 調(diào)制解調(diào)系統(tǒng)仿真圖如下 ..............................................................................................29 本章小結(jié) .............................