摘要
Thispaperfocusesontheissueofcollaborativespectrumsensingincognitiveultrawideband(CUWB)impulseradio.Weemployenergy-basedsignaldetectionmethodandapplytheNeyman-Pearson(NP)decisionruletodeterminetheoptimumthreshold.Twocooperativespectrumsensingschemesaredevelopedinthispaper.Thedecisionfusionschemeisbasedonharddecision,inwhicheachcooperatingcognitiveuser(CU)sendsitsownlocaldecisiontothefusioncenter(FC).TheFCthenmakesafinaldecisionaccordingtothemajorityvotingrule.Alternatively,thedatafusionschemeisbasedonsoftdecision,inwhicheachlocalCUsendsitsobservedvaluedirectlytotheFC.TheFCcombinesthesevalues,comparestoathresholdandthenmakesthefinaldecision.Theperformancesofbothschemesarestudiedbyusinganalyticaltoolsandcomputersimulations.Thereceiveroperatingcharacteristics(ROC),whichrevealtheprobabilityofdetectionversusfalse-alarmcurve,areemployedtoevaluatethesystemperformanceunderdifferentscenarios.SimulationresultsdemonstratethatthedatafusionschemeoutperformsthedecisionfusionschemeandverifythatthecollaborativespectrumsensinghaspracticalimportanceinCUWBnetworks.
出版日期
2015年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
