基于fpga的dmr系统4-cpfsk调制器的研究与实现word格式论文.docxVIP

山东科技大学硕士学位论文摘要摘要当今专用无线通信系统正处于迅速发展的时期，其主要用于单位的调度指挥、组呼等方面。随着移动通信技术和数字信号处理技术的发展，专用无线通信系统正逐步经历由模拟通信向数字通信的转变。DMR(DigitalMobileRadio)标准是欧洲电信标准协会(ETSI)正在完善的必威体育精装版的专用数字无线移动通信标准。相较于之前的集群通信系统，DMR具有技术简单，成本较低，并且支持从模拟通信到数字通信的过渡等优点。当前DMR系统的发展无论在国内还是国外都处于起步阶段。我们应该抓住机会在技术上与国际保持同步，改善我国数字集群通信的发展现状。本文首先介绍了DMR系统物理层的一些关键技术，包括DMR空中接口协议，帧结构，同步与定时等。接着详细介绍了DMR标准规定的四电平连续相位频移键控(4-CPFSK,ContinuousPhaseFrequencyShiftKeying)调制解调技术以及数字滤波器的设计方法。然后本文重点论述了DMR标准4-CPFSK调制器的FPGA实现，用VerilogHDL建模来实现各个模块的功能，包括成型滤波，上采样，相位积分等。最后用Matlab对4-CPFSK调制器进行建模并仿真分析，用硬件描述语仿真软件ModelSim对Verilog模块进行功能验证。关键词：专用无线通信系统，DMR，连续相位频移键控，4-CPFSK，FPGAAbstractTrunkingCommunicationSystemisoneofthemostrapidlygrowingspecialmobilecommunicationsystem.It’susuallyusedasagroupmobiledispatchingsystemforspecialmobilecommunicationpurpose.Duringthedevelopmentofmobile communicationtechnologyanddigitalsignalprocessingtechnology,trunkingsystemis transferring fromanalogsystemtodigitalsystem.DMRisthelatestdigitalmobilecommunicationsystemtheETSI(EuropeanTelecommunicationStandardsInstitute)isimproving.Comparedwiththetrunkingcommunicationsystembefore,DMRhasanadvantageofsimpletechnology,lowcost,andsupportingtransitionfromanalogcommunicationtodigitalcommunication.Atpresent,thedevelopmentofDMRsystemisinthebeginningstagebothathomeandabroad.Weshouldseizetheopportunitytokeeppacewithinternationaltechnology,improvepresentsituationofourdigitaltrunkingcommunicationdevelopment.ThispaperfirstintroducessomephysicalkeytechnologiesofDMRsystem,includingDMRairinterfaceagreement,framestructure,synchronousandtiming,etc.ThenintroducesthefourlevelContinuousPhaseFrequencyShiftKeying(4-CPFSK)modulationanddemodulationtechnology,andthedesignmethodofdigitalfilter.Thenthispaperdiscussesmainlythe complementationofDMRstandard 4-CPFSKmodulatorbased onFPGA,withVerilogHDLmodelingtoimplementthe functionofeachmodule,includingshapingfilter,upsample,phaseintegral,etc.FinallyusedMatlabtomodelandsimulatethe4-CPFSKmodulator,andusedhardwaredescriptionlanguagesimulationtoolModelSimtoverifytheVer