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石家庄铁道大学四方学院毕业设计基于Simulink的16QAM调制解调系统的设计16QAMModulationDemodulationSystemDesignBasedonSimulink摘要16进制正交振幅调制技术(16QAM)是一种功率和带宽相对高效的信道调制技术，这种方式具有很高的频谱利用率，在调制进制数较高时，信号矢量集的分布也较合理，同时实现起来也较方便。因此在大容量数字微波通信系统、有线电视网络高速数据传输、卫星通信系统等领域得到了广泛应用。所以，16QAM应用起来容易实现，并有抗噪声性能强的优点。本文首先研究了QAM调制解调系统的工作原理。然后利用Simulink对16QAM调制系统进行仿真，通过分析信号加噪前后的星座图、眼图，以及信噪比变化条件下系统的误码率，从而分析16QAM系统性能。最后，为了证明16QAM是一种相对优越的调制解调系统，使其与2DPSK的误码率做比较。通过仿真实验的实现，证明了该系统满足设计要求，能够完成其系统的仿真，并能通过眼图、星座图、误码率来验证系统的性能。关键词：16QAM仿真2DPSK误码率AbstractHexadecimalorthogonalamplitudemodulationtechnology(16QAM)isakindofpowerandbandwidthrelativelyefficientchannelmodulationtechnology,thiskindofmeansisofhighfrequencyspectrumefficiencyinthemodulationsystemintoseveralhigh,thedistributionofthesignalvectorsetmorereasonablealsorealizerisemoreconvenientalso.Ithasbeenusedwidelyinfieldoflarge-capacitydigitalmicrowavecommunicationsystemshigh-speeddatatransmissioncabletelevisionnetworkandsatellitecommunications.So,16QAMapplicationupeasytoimplementandhavetheadvantagesofthestrongperformanceofthenoise.ThisarticlebrieflyintroducehowQAMmodulationanddemodulationsystemworks.Afterasimulationofthe16QAMmodulationsystem,throughtheanalysisofsignalisaddedanoiseoftheconstellationchart,beforeandaftereyechart,andsignal-to-noiseratiochangeconditionsthesystemBER,soastoanalyze16QAMandsystemperformance.Finally,inordertoprovethatthe16QAMisarelativelysuperiordemodulationsystem,makeitsand2DPSKBERcompare.ThroughthesimulationtestthesystemtosatisfythedesignrequirementscanperformitssystemsimulationandthroughtheeyechartconstellationchartBERtoverifytheperformanceofthesystem.Keywords:16QAMSimulation2DPSKBERI目录第1章绪论...................................................................................................................................11.1课题研究背景......................................................................................................................11.2国内外研究现状..................................................................................................................11.3主要研究内容......................................................................................................................2第2章正交振幅调制...................................................................................................................32.1正交振幅调制的概述..........................................................................................................32.2MQAM信号的星座图........................................................................................................42.3QAM的调制解调原理.......................................................................................................6第3章基于Simulink的16QAM调制解调系统实现与仿真...................................................73.116QAM调制模块的模型建立与仿真...............................................................................83.1.1信号源...........................................................................................................................83.1.2串并转换模块...............................................................................................................83.1.32/4电平转换模块.........................................................................................................93.1.4调制系统的实现.........................................................................................................113.216QAM解调模块的模型建立与仿真.............................................................................123.2.1相干解调.....................................................................................................................123.2.24/2电平判决...............................................................................................................123.2.3并串转换.....................................................................................................................13第4章16QAM系统性能分析..................................................................................................154.1眼图....................................................................................................................................154.2星座图................................................................................................................................164.3误码率................................................................................................................................184.416QAM与2DPSK系统性能比较...................................................................................19第5章16QAM的应用..............................................................................................................21第6章结论与总结.....................................................................................................................226.1本文总结............................................................................................................................226.2不足与展望........................................................................................................................22参考文献..................................................................................