基于认知无线电技术的系统级动态频谱分配方案(英文)-豆柴文库

您所在位置：网站首页 / 基于认知无线电技术的系统级动态频谱分配方案(英文).docx / 文档详情

在线预览结束，喜欢就下载吧，查找使用更方便

5 金币

下载文档

/ 3

下载提示

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

文本预览

基于认知无线电技术的系统级动态频谱分配方案(英文)
Introduction:
Therapidexpansionofwirelesscommunicationshasledtoanunprecedentedincreaseindemandforspectrumresources.Consequently,efficientspectrummanagementtechniquesareneededtocopewiththeincreasingdemand.Cognitiveradio(CR)emergedasapromisingtechnologytoeffectivelyutilizespectrumresourcesandaddresstheproblemofspectrumscarcity.InCRsystems,dynamicspectrumallocationisoneofthekeyapproachestoenableefficientspectrumutilization.Thispaperexploresthesystem-leveldynamicspectrumallocationschemebasedoncognitiveradiotechnology.
Background:
Cognitiveradiotechnologyisaninnovativesolutiontoimprovespectrumefficiencybyenablingopportunisticaccesstounderutilizedlicensedspectrum.Itcomprisesoftwokeyfeatures,namelyspectrumsensinganddynamicspectrumallocation.SpectrumsensingistheabilityofaCRdevicetodetectthepresenceofprimaryusers(PUs)inalicensedband,whereasdynamicspectrumallocationreferstotheallocationoffrequencybandstoCRusersinreal-timebasedontheircurrentspectrumrequirementsandavailability.
Thecognitiveradionetwork(CRN)employsadvancedtechniquessuchasspectrumsensing,channelestimation,trafficprediction,andradioresourcemanagementtoprovidetherequiredflexibilityandadaptabilitytooptimizespectrumallocationefficiently.Differentaspectsofdynamicspectrumallocationincludespectrumsensing,channelselection,modulationandcodingschemes,powerallocation,andinterferencemitigation.
DynamicSpectrumAllocation:
Basedonthecurrentspectrumallocationstatusanduserrequirements,cognitiveradiosystemscandynamicallyallocateunusedspectrumslicesfromlicensedbandstoCRusers.Thedynamicspectrumallocationcanbedonebasedondifferentstrategies,includingopportunisticspectrumaccess,spectrumtrading,spectrumsharing,andspectrumpooling.
OpportunisticSpectrumAccess:
OPSAisafundamentalconceptinCRNs,whichreferstotheopportunisticusageoftheunusedfrequencysegments,wherenoPUtransmissionisdetected.TheopportunisticspectrumaccessmodelenablesCRuserstoutilizetheunusedspectrumslotstemporarily.Inthismodel,CRusersactassecondaryuser