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1、QPSK调制与解调的软件实现摘要：随着移动通信技术的发展，以前在数字蜂窝系统中采用FSK、ASK、PSK等调制方式，逐渐被许多优秀的调制技术所替代，其中四相移相键控QPSK技术是无线通信技术中比较突出的一种二进制调制方法。本文主要介绍了QPSK调制与解调的实现原理框图，重点研究了用MATLAB软件中的SIMULINK仿真功能对QPSK调制与解调这一过程如何建立仿真模型，通过对仿真模型的运行，得到了信号在QPSK调制与解调调过程中的信号时域变化图。通过该软件实现方式，可以大大提高设计的灵活性，节约设计时间，提高设计效率，从而缩
2、小硬件电路设计的工作量，缩短开发周期。关键词：数字蜂窝系统，四相移相键控，调制，解调。Thegeneralstaff(1employeesinadditiontovicepresident,director,manager,deputymanagerandspecialpositionsoutsidethecontractperiod)toresign,togive10daysnotice,theprojectmanagerordepartmentmanager,administrativepersonneldepartme
3、ntorrelevantresponsiblepersonfortherelevantvisaafterdepartureprocedures;inadditiontogeneralstaffpersonneloutsidethecontractperiodofturnovermustsubmittheresignationreport,amonthaheadofschedule,theadministrativepersonneldepartment,generalmanagerofvisabeforeseparation
4、procedures;probationemployeesshallpayinadvance5resignationreport,theprojectmanagerordepartmentmanagerandadministrativepersonneldepartmentvisabeforedeparture;positiveafterspecialreasonsdidnotsignacontractwithreferencetogeneralemployeesThroughthestaffQPSKmodulationan
5、ddemodulationofsoftwareimplementationAbstract：Asmobilecommunicationstechnology,andpreviouslyintheadoptionofdigitalcellularsystem,ASK,FSKPSKmodulation,etc.Graduallybeenmanyexcellentmodulationtechnologysubstitution,wherefourphase-shiftkeyingQPSKtechnologyisawirelessc
6、ommunicationstechnologyinabinarymodulationmethod.ThisarticleprimarilydescribesQPSKmodulationanddemodulationoftheimplementationoftheprincipleofblockdiagrams,focusesontheMATLABSIMULINKsoftwareemulationinonQPSKmodulationanddemodulationtheprocesshowtobuildasimulationmo
7、del,throughtheoperationofsimulationmodel,IgetsignalinQPSKmodulationanddemodulationadjustmentprocessdomainchangefigure.Thesoftwareimplementation,candramaticallyimprovethedesignflexibility,savingdesigntime,increaseefficiency,designtoreducetheworkloadofhardwarecircuit
8、design,andshortenthedevelopmentcycle.Keywords：Digitalcellularsystem,QPSK,modulation,demodulation.Thegeneralstaff(1employeesinadditiontovicepresid
