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1、本科毕业设计（20届）基于MC1496的2DPSK调制解调器设计摘要调制解调器（modem）是数字通信技术中的一个重要组成部分。随着通信技术日新月异的发展，尤其是数字通信的快速发展越来越普及，数字通信广泛应用于单位企业和个人家庭中。对于学习有关该技术专业的学生来说，需要对调制解调器的工作原理和工作次序作更好的了解，这样对自己的工作和学习也有更多的帮助，所以课题选择了设计基于MC1496的2DPSK调制解调系统。论文根据技术要求和功能要求设计各单元电路，包括时钟电路、调制模块中的信号源产生电路、差分编码电路和2PSK调制电路，以及解调模块
2、中的延时电路、噪声源电路、带通滤波器、乘法器、低通滤波器、抽样判决器以及码反变换电路；利用protel软件画出各模块电路图；然后在电路板上安装、焊接所设计的电路；再对所焊的电路进行调试、测量，作好有关的数据、波形。最后完成符合要求的2DPSK调制解调器。关键词：数字通信；差分移相键控（2DPSK）；MC1496AbstractWiththerapiddevelopmentofcommunicationtechnology,especiallytherapidadoptionofdigitalcommunication,theresear
3、chersputonitsrelevanttechnologyofgreatinterest.Inordertomakethedigitalsignaltransferintheband-passchannel,itmustmodulatethecarrierwaveusingdigitalsignal,anditsmodulationmodeissimilartothatofanalogsignal.Throughthechanneltransmission,themodulatedsignalscanreturntodigitals
4、ignalsafterdemodulationatthereceiver.Therefore,medulationanddemodulationtechnologyareimportantmeansofrealizingthemoderncommunication,andtheypromotetherapiddevelopmentofcommunication.Modemisanimportantpartofdigitalcommunicationtechnology,andwidelyusedinenterprisesandindiv
5、idualfamilies.Toourstudentsthatlearnabouttheprofessionaltechnology,weshouldhaveabetterunderstandingofmodem’sworkingprincipleandworkingorder,itwillalsodohelptoourworkandstudy.Therefore,inthesubjectitwilldesignthe2DPSKdemodulationsystembaseingonMC1496.Thesubjectadoptshardw
6、aredesignwithsoftwaresimulation,designseachunitcircuitaccordingtothetechnicalrequirementsandfunctiondiagram,Includingclockmodule,demodulationmodulecircuitand2PSKdifferentialcodingmodulationanddemodulationmodulecircuitandthedelaycircuitandnoisecircuit,band-passfilter,onti
7、me-multiplier,low-passfilter,samplingjudgmentdeviceandyardsinversetransformcircuit;dependsonthesituationtosimulateandmodificate,andthenformstheentiresystemcircuit.Thenweshouldinstallandweldthedesignedcircuitonthecircuitboard,anddebugandmeasuretheweldingcircuit,recordthed
8、atasandwaveforms.Atlast,itwillaccomplishthedesirable2DPSKmodem.Keywords:digitalcommunication;differenti
