通信工程毕业设计的论文外文翻译一个新的协作频谱感知算法认知无线电络.doc

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1、...毕业设计（论文）外文参考资料及译文译文题目：一个新的协作频谱感知算法认知无线电网络　　　　　学生：学　　号：专　　业：通信工程所在学院：龙蟠学院指导教师：田甜职　　称：讲师2011年12月1日.......说明：要求学生结合毕业设计（论文）课题参阅一篇以上的外文资料，并翻译至少一万印刷符（或译出3千汉字）以上的译文。译文原则上要求打印（如手写，一律用400字方格稿纸书写），连同学校提供的统一封面及英文原文装订，于毕业设计（论文）工作开始后2周完成，作为成绩考核的一部分。ANewCooperativeSpectrumSensingAlgorithmforCognitiveRadioNet

2、worksAbstract—spectrumsensingisacriticalphaseinbuildingacognitiveradionetwork.However,thebandwidthforreportingsecondaryusers’sensingresultswillbeinsufficient,whenthenumberofsecondaryuserisverylarge.Inthispaper,weproposeanewcooperativespectrumsensingalgorithmtoalleviatethebandwidthproblemofreporting

3、channel.Comparedwithconventionalmethod,onlythesecondaryuserswithreliableinformationareallowedtoreporttheirsensingresults.Whennouserwithreliableinformation,onlythesecondaryuserwithhighestreputationwillreportitssensingresult.Simulationresultsshowthatouralgorithmachievesbettersensingperformanceandthea

4、veragenumberofsensingbitsdecreasegreatly.Keywords—cognitiveradio;cooperativespectrumsensing;doublethreshold;reputationⅠ.INTRODUCTIONDuetotheincreasinglydevelopmentofwirelessapplications,moreandmorespectrumresourcesareneededtosupportnumerousemergingwirelessservice.However,recentmeasurementsbyFederal

5、CommunicationCommission(FCC)haveshownthat70%oftheallocated.......spectruminUSisnotutilized[1].Inordertoincreasetheefficiencyofspectrumutilization,cognitiveradiotechnologywasrecentlyproposed[2],[3].Arequirementofcognitiveradiosisthattheirtransmissionshouldnotcauseharmfulinterferencetoprimaryusers.Na

6、mely,thesecondaryuserscanusethelicensedspectrumaslongastheprimaryuserisabsent.However,whentheprimaryusercomesbackintooperation,thesecondaryusersshouldvacatethespectruminstantlytoavoidinterferencewiththeprimaryuser.Accordingly,spectrumsensingisacrucialphaseinbuildingacognitiveradiosystem.Oneofthegre

7、atchallengesofimplementingspectrumsensingisthehiddenterminalproblemwhichcausedbythefadingofthechannelsandtheshadowingeffects.Inordertodealwiththehiddenterminalproblem,cooperativespectrumsensinghasbeenstudie