毕设—QPSK的调制解调.zip_调制_调制解调_matlab例程

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/6265f1144f8811599e998b39/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6265f1144f8811599e998b39/bg1.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0"> 目 录</div><div class="t m0 x1 h4 y3 ff2 fs2 fc0 sc0 ls0 ws0">摘 要.......................................................................................................................................1</div><div class="t m0 x1 h5 y4 ff3 fs2 fc0 sc0 ls0 ws0">ABSTRACT...........................................................................................................................2</div><div class="t m0 x1 h4 y5 ff2 fs2 fc0 sc0 ls0 ws0">第 1 章 绪 论..........................................................................................................................4</div><div class="t m0 x2 h4 y6 ff3 fs2 fc0 sc0 ls0 ws0">1.1 课题背景、目的及意义...........................................................................................4</div><div class="t m0 x2 h4 y7 ff3 fs2 fc0 sc0 ls0 ws0">1.2 课题的主要内容.......................................................................................................5</div><div class="t m0 x2 h4 y8 ff3 fs2 fc0 sc0 ls0 ws0">1.3 本论文的结构安排...................................................................................................5</div><div class="t m0 x1 h4 y9 ff2 fs2 fc0 sc0 ls0 ws0">第 2 章 调制解调技术...........................................................................................................6</div><div class="t m0 x2 h4 ya ff3 fs2 fc0 sc0 ls0 ws0">2.1 常见的调制解调技术...............................................................................................6</div><div class="t m0 x2 h4 yb ff3 fs2 fc0 sc0 ls0 ws0">2.2 QPSK 技术................................................................................................................6</div><div class="t m0 x3 h4 yc ff3 fs2 fc0 sc0 ls0 ws0">2.2.1 QPSK 原理......................................................................................................6</div><div class="t m0 x3 h4 yd ff3 fs2 fc0 sc0 ls0 ws0">2.2.2 QPSK 实际应用............................................................................................11</div><div class="t m0 x2 h4 ye ff3 fs2 fc0 sc0 ls0 ws0">2.3 比较联系.................................................................................................................12</div><div class="t m0 x2 h4 yf ff3 fs2 fc0 sc0 ls0 ws0">2.4 QPSK 应用前景......................................................................................................12</div><div class="t m0 x1 h4 y10 ff2 fs2 fc0 sc0 ls0 ws0">第 3 章 MATLAB 简介........................................................................................................13</div><div class="t m0 x2 h4 y11 ff3 fs2 fc0 sc0 ls0 ws0">3.1 MATLAB 概貌..........................................................................................................13</div><div class="t m0 x3 h4 y12 ff3 fs2 fc0 sc0 ls0 ws0">3.1.1 MATLAB 的发展..........................................................................................13</div><div class="t m0 x3 h4 y13 ff3 fs2 fc0 sc0 ls0 ws0">3.1.2 Matlab 的主要功能.......................................................................................14</div><div class="t m0 x2 h4 y14 ff3 fs2 fc0 sc0 ls0 ws0">3.2 MATLAB 的优势及特点..........................................................................................15</div><div class="t m0 x3 h4 y15 ff3 fs2 fc0 sc0 ls0 ws0">3.2.1 Matlab 的优势...............................................................................................15</div><div class="t m0 x3 h4 y16 ff3 fs2 fc0 sc0 ls0 ws0">3.2.2 Matlab 语言的特点.......................................................................................15</div><div class="t m0 x1 h4 y17 ff2 fs2 fc0 sc0 ls0 ws0">第 4 章 QPSK 调制解调设计..............................................................................................16</div><div class="t m0 x2 h4 y18 ff3 fs2 fc0 sc0 ls0 ws0">4.1 设计步骤.................................................................................................................16</div><div class="t m0 x2 h4 y19 ff3 fs2 fc0 sc0 ls0 ws0">4.2 QPSK 的调制解调..................................................................................................18</div><div class="t m0 x2 h4 y1a ff3 fs2 fc0 sc0 ls0 ws0">4.3 QPSK 在高斯噪声情况下调制解调......................................................................22</div><div class="t m0 x2 h4 y1b ff3 fs2 fc0 sc0 ls0 ws0">4.4 QPSK 抗噪声性能仿真..........................................................................................26</div><div class="t m0 x1 h4 y1c ff2 fs2 fc0 sc0 ls0 ws0">第五章 结论与总结.............................................................................................................28</div><div class="t m0 x1 h4 y1d ff2 fs2 fc0 sc0 ls0 ws0">参考文献..............................................................................................................................29</div><div class="t m0 x1 h4 y1e ff2 fs2 fc0 sc0 ls0 ws0">致 谢.....................................................................................................................................30</div><div class="t m0 x1 h4 y1f ff2 fs2 fc0 sc0 ls0 ws0">附录 1 代码..........................................................................................................................32</div></div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d 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<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6265f1144f8811599e998b39/bg2.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h4 y20 ff2 fs2 fc0 sc0 ls0 ws0">附录 2 外文文献及翻译......................................................................................................39</div><div class="t m0 x2 h4 y21 ff2 fs2 fc0 sc0 ls0 ws0">外文文献.......................................................................................................................39</div><div class="t m0 x2 h4 y22 ff2 fs2 fc0 sc0 ls0 ws0">中文翻译.......................................................................................................................43</div><div class="t m0 x1 h4 y23 ff2 fs2 fc0 sc0 ls0 ws0">附录 3 毕业设计任务书......................................................................................................46</div><div class="t m0 x1 h4 y24 ff2 fs2 fc0 sc0 ls0 ws0">附录 4 开题报告..................................................................................................................48</div><div class="t m0 x1 h4 y25 ff3 fs2 fc0 sc0 ls0 ws0">1.翻译外文资料。...............................................................................................................49</div><div class="t m0 x1 h4 y26 ff3 fs2 fc0 sc0 ls0 ws0">9～10 周：熟练运用仿真软件 MATLAB，系统整体设计，；......................................50</div></div><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a><a class="l" rel='nofollow' onclick='return false;'><div class="d m1"></div></a></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>

<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6265f1144f8811599e998b39/bg3.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x4 h6 y27 ff2 fs4 fc0 sc1 ls0 ws0">摘 要</div><div class="t m0 x5 h4 y28 ff2 fs2 fc0 sc0 ls0 ws0">在 21 世界信息飞速发展的时代，各个国家对通信行业的支持更是不遗余力。</div><div class="t m0 x1 h4 y29 ff2 fs2 fc0 sc0 ls0 ws0">当前我国 3G 行业正值蓬勃发展，国家又在大力倡导三网融合。各个运营商都在极</div><div class="t m0 x1 h4 y2a ff2 fs2 fc0 sc0 ls0 ws0">力扩展自己的业务。这也在为客户服务方面有了更高的要求、更高的质量。众所周</div><div class="t m0 x1 h4 y2b ff2 fs2 fc0 sc0 ls0 ws0">知，调制解调技术是信号传输的基本和核心。好的技术能够快速地传递用户信息，</div><div class="t m0 x1 h4 y2c ff2 fs2 fc0 sc0 ls0 ws0">并且有着高的准确性（即非常低的误码率）和可靠性。QPSK 调制解调技术以其高</div><div class="t m0 x1 h4 y2d ff2 fs2 fc0 sc0 ls0 ws0">的解调速率、低的误码率，在 CDMA 领域得到广泛应用。此项研究，对通信行业的</div><div class="t m0 x1 h4 y2e ff2 fs2 fc0 sc0 ls0 ws0">发展有着积极推进的作用，利于提高我国通信行业的技术水准，以便于更好的为国</div><div class="t m0 x1 h4 y2f ff2 fs2 fc0 sc0 ls0 ws0">家和人民服务。</div><div class="t m0 x5 h4 y30 ff2 fs2 fc0 sc0 ls0 ws0">论文分作五部分，第一章是绪论，简单阐述 QPSK 课题的研究背景以及课题内</div><div class="t m0 x1 h4 y31 ff2 fs2 fc0 sc0 ls0 ws0">容和整个论文的结构安排；第二章简单介绍了了 QPSK 调制解调的原理和方法，系</div><div class="t m0 x1 h4 y32 ff2 fs2 fc0 sc0 ls0 ws0">统阐述了最常见的 2ASK、2PSK、2FSK 的原理和方法，最后再对他们做一个系统</div><div class="t m0 x1 h4 y33 ff2 fs2 fc0 sc0 ls0 ws0">的比较，以便明白 QPSK 的优点和性能；第三章是对所用工具 MATLAB 做一个大概</div><div class="t m0 x1 h4 y34 ff2 fs2 fc0 sc0 ls0 ws0">的阐述，讲解了 MATLAB 的发展、性能、所用于语言，以及在各个领域的应用。为</div><div class="t m0 x1 h4 y35 ff2 fs2 fc0 sc0 ls0 ws0">后边编写程序做下准备、第四章针对此次课题 QPSK 的调制解调提出具体的方案，</div><div class="t m0 x1 h4 y36 ff2 fs2 fc0 sc0 ls0 ws0">按调制和解调的步骤，一步步编写出程序，然后，利用 MATLAB 工具对程序做出相</div><div class="t m0 x1 h4 y37 ff2 fs2 fc0 sc0 ls0 ws0">应的仿真，在仿真过程中加入噪声分析，最后在对它的误码率做一个研究；第五章</div><div class="t m0 x1 h4 y38 ff2 fs2 fc0 sc0 ls0 ws0">是对整个毕设的结论和总结，感悟自己在这一时间内的所学所感，对自己的努力做</div><div class="t m0 x1 h4 y39 ff2 fs2 fc0 sc0 ls0 ws0">一个回顾，以便在今后的生活和学习中，有更进一步的提高</div><div class="t m0 x5 h4 y3a ff5 fs2 fc0 sc0 ls0 ws0">首先介绍了 QPSK 的调制解调原理，接着提出了一种基于 MATLAB 的调制解调</div><div class="t m0 x1 h4 y3b ff2 fs2 fc0 sc0 ls0 ws0">方案，包括串并转换、电平转换、载波调制、信号合成、相干解调、抽样判决，和</div><div class="t m0 x1 h4 y3c ff2 fs2 fc0 sc0 ls0 ws0">并串转换一系列系统的设计，对 QPSK 的星座图和调制解调进行了仿真，并对系统</div><div class="t m0 x1 h4 y3d ff2 fs2 fc0 sc0 ls0 ws0">性能进行了分析，进而证明 QPSK 调制技术的优越性。</div><div class="t m0 x1 h4 y3e ff5 fs2 fc0 sc0 ls0 ws0">关键字：QPSK 调制解调 电平转换 相干解调 抽样判决 </div><div class="t m0 x6 h7 y3f ff3 fs5 fc0 sc0 ls0 ws0">1</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>

<div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6265f1144f8811599e998b39/bg4.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x7 h8 y40 ff1 fs4 fc0 sc0 ls0 ws0">Abstract</div><div class="t m0 x8 h9 y41 ff3 fs0 fc0 sc0 ls0 ws0">In the twenty-first century,the information in the era of rapid development of various countries in</div><div class="t m0 x1 h9 y42 ff3 fs0 fc0 sc0 ls0 ws0">the world, and the communications industry support is spare no effort. .Current, China 3G industry was</div><div class="t m0 x1 h9 y43 ff3 fs0 fc0 sc0 ls0 ws0">booming, and vigorously promote national integration in the. Various operators are trying to expand</div><div class="t m0 x1 h9 y44 ff3 fs0 fc0 sc0 ls0 ws0">their business. This is also for customer service had higher demand, higher quality. As everyone knows,</div><div class="t m0 x1 h9 y45 ff3 fs0 fc0 sc0 ls0 ws0">modulation and demodulation technology is the basic and core of signal transmission. Good technology</div><div class="t m0 x1 h9 y46 ff3 fs0 fc0 sc0 ls0 ws0">can rapidly transfer the user information, and with high accuracy (i.e., very low bit error rate ) and</div><div class="t m0 x1 h9 y47 ff3 fs0 fc0 sc0 ls0 ws0">reliability. QPSK modulation and demodulation technology for its high demodulation rate, low error</div><div class="t m0 x1 h9 y48 ff3 fs0 fc0 sc0 ls0 ws0">rate, have been widely applied in CDMA. In this study, the communications industry development has a</div><div class="t m0 x1 h9 y49 ff3 fs0 fc0 sc0 ls0 ws0">positive promotion role, help improve China's communication industry technical standards, in order to</div><div class="t m0 x1 h9 y4a ff3 fs0 fc0 sc0 ls0 ws0">better serve our country and our people.</div><div class="t m0 x9 h9 y4b ff3 fs0 fc0 sc0 ls0 ws0">The paper is divided into five parts, the first chapter is the introduction, introduced QPSK the</div><div class="t m0 x1 h9 y12 ff3 fs0 fc0 sc0 ls0 ws0">research background of the subject and topic content and the organization of this thesis; the second</div><div class="t m0 x1 h9 y4c ff3 fs0 fc0 sc0 ls0 ws0">chapter briefly introduces the QPSK modulation and demodulation principle and method, the system</div><div class="t m0 x1 h9 y4d ff3 fs0 fc0 sc0 ls0 ws0">elaborated the most common 2ASK,2PSK,2FSK principle and method, finally to make one a systematic</div><div class="t m0 x1 h9 y4e ff3 fs0 fc0 sc0 ls0 ws0">comparison, in order to understand the advantages of QPSK and performance; the third chapter is on the</div><div class="t m0 x1 h9 y4f ff3 fs0 fc0 sc0 ls0 ws0">tool used MATLAB do probably explain, explain the development of MATLAB, performance, is used</div><div class="t m0 x1 h9 y50 ff3 fs0 fc0 sc0 ls0 ws0">for the language, as well as in the various fields of application. For behind the program do preparation,</div><div class="t m0 x1 h9 y51 ff3 fs0 fc0 sc0 ls0 ws0">in the fourth chapter the task of modulation and demodulation of QPSK put forward the concrete</div><div class="t m0 x1 h9 y52 ff3 fs0 fc0 sc0 ls0 ws0">scheme according to the modulation and demodulation, step, step by step preparation procedures, and</div><div class="t m0 x1 h9 y53 ff3 fs0 fc0 sc0 ls0 ws0">then, using MATLAB tools to make the corresponding simulation program, in the process of simulation</div><div class="t m0 x1 h9 y54 ff3 fs0 fc0 sc0 ls0 ws0">adding noise analysis, at last on its bit error rate do a study; Chapter fifth is on the whole complete set of</div><div class="t m0 x1 h9 y55 ff3 fs0 fc0 sc0 ls0 ws0">conclusions and summary, feeling myself at this time what are, on their own to do a review, so that in</div><div class="t m0 x1 h9 y56 ff3 fs0 fc0 sc0 ls0 ws0">the future life and study, has further improved</div><div class="t m0 x1 h9 y57 ff3 fs0 fc0 sc0 ls0 ws0"> First, the article will introduce the QPSK modulation and demodulation principle, then proposed</div><div class="t m0 x6 h7 y3f ff3 fs5 fc0 sc0 ls0 ws0">2</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>

<div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6265f1144f8811599e998b39/bg5.jpg"><div class="c x0 y1 w2 h2"><div class="t m0 x1 h9 y58 ff3 fs0 fc0 sc0 ls0 ws0">one kind based on the MATLAB modulation and demodulation of the program, including the string and</div><div class="t m0 x1 h9 y59 ff3 fs0 fc0 sc0 ls0 ws0">the conversion, conversion, carrier modulation, signal synthesis, coherent demodulation, sample</div><div class="t m0 x1 h9 y5a ff3 fs0 fc0 sc0 ls0 ws0">sentences and string conversion, and a series of system design, the QPSK constellation diagram and the</div><div class="t m0 x1 h9 y5b ff3 fs0 fc0 sc0 ls0 ws0">modulation and demodulation of the simulation, and the performance of the system are analyzed, and</div><div class="t m0 x1 h9 y5c ff3 fs0 fc0 sc0 ls0 ws0">then proved the superiority of QPSK modulation technology.</div><div class="t m0 x1 h9 y5d ff3 fs0 fc0 sc0 ls0 ws0">Keyword: QPSK Modulation and Demodulation Level Conversion </div><div class="t m0 x1 h9 y5e ff3 fs0 fc0 sc0 ls0 ws0"> Coherent Demodulation The sample Sentences</div><div class="t m0 x6 h7 y3f ff3 fs5 fc0 sc0 ls0 ws0">3</div></div></div><div class="pi" data-data='{"ctm":[1.611850,0.000000,0.000000,1.611850,0.000000,0.000000]}'></div></div>