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1、CDMA2000系统微型直放站发信通道设计CDMA2000系统微型直放站发信通道设计摘要直放站是随着移动通信的发展而出现的一种无线通信设备。直放站的应用在第一代模拟移动通信网建立时就已经开始，随着移动通信技术向纵深发展，通信网络面临着一个如何提高网络覆盖质量的问题。直放站以低投入、低成本、相对短的建设周期和较好的网络质量提高了网络信号的覆盖率，已经成为无线网络覆盖中的重要设备。目前，第三代移动通信技术已成为国内外移动通信领域的研究热点，相应的射频技术也是通信领域的主要研究方向。本文首先总结3G的系统，特点及三种无线传输方案，然后介绍了CDMA2000的工作原理和体系结构，并对各种结构的相
2、关概念、主要特点、关键技术进行了简要说明，此外，还简单介绍了无线通信信道的基本原理及传播损耗模型。接着介绍了移动通信直放站的原理和CDMA直放站的技术指标。最后从项目所要求的增益、噪声等指标入手，详述本课题硬件方案，作可行性论证，选取合适的芯片与电路结构实现了CDMA直放站的射频发射单元，并总结设计中注意的问题。关键词：CDMA直放站；射频；硬件电路设计；低噪声放大器；功率放大器IIICDMA2000系统微型直放站发信通道设计AbstractAlongwiththedevelopmentofthemobilecommunication,repeaterisaradiocommunicat
3、ionequipment.Whenthe1stgenerationAnalogmobilecommunicationnetworkisestablished,theapplicationofrepeaterhadstarted，andasthemobilecommunicationtechnologyhasdevelopeddeeply,communicationnetworkmeetsaquestion,thatishowtoimprovethequalitywhichthenetworkcoverswith.Repeateradvancesthecoverageofnetworksi
4、gnalwithlowdevotion,lowcost，relativeshortbuildingcycleandpreferablenetworkquality,andithasbeenanimportantequipmenttoradionetworkcoverage.Atpresent,inthefieldofmobilecommunication,the3rdgenerationmobilecommunicationtechnology(3G)hasbecometheresearchhotspot,andtherelevantradiofrequencytechnologyisa
5、lsothemaininvestigativedirection.Inthispaper,itsummarizesthesystemstructureandfeaturesof3GandthreeprimarykindsofradiotransmissiontechnologyincludingCDMA2000firstly,andthenintroducestheworkprincipleandsystemstructureofCDMA2000detailedlyandconcretely,anditbrieflyexplainsthecorrelativeconception,pri
6、maryfeature,andkeytechnology.Besides,italsobrieflyintroducesthebasicprincipleandsometransmissionullagemodelsofwirelesscommunication.Whereafter,itintroducestheprinciplesofrepeaterusedinmobilecommunicationandtechnologyindexesofCDMARepeater.Finally,itproceedswiththeindexesofgain,noise,etc,whichrequi
7、redbytheitem,todiscussthehardwareschemeindetail,tomakefeasibleargumentation,andtochoosethesuitablechipandcircuitstructure.TheradiorepeatercellofselectedfrequencyacceptanceinCDMARepeaterhasbeenachieved.Otherwise,itsumsu
