基于块FFT的TD-SCDMA联合检测技术的比较研究(英文)-豆柴文库

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基于块FFT的TD-SCDMA联合检测技术的比较研究(英文)
Introduction
Time-divisionsynchronouscodedivisionmultipleaccess(TD-SCDMA)technologyisoneofthe3Gmobilecommunicationtechnologies.Comparedwithother3Gtechnologies,TD-SCDMAhasuniqueadvantagesintermsofspectrumefficiency,supportforhigh-speedmovement,anddelaycharacteristics.OneofthemostcriticalissuesinTD-SCDMAsystemsisjointdetectionintheuplink.Duetothemultipathfadingandinterference,thedetectionofsignalsfromdifferentusersisachallengingproblem.FastFouriertransform(FFT)-basedjointdetectionalgorithmshavebeenwidelyusedinTD-SCDMAsystems.Inthispaper,wecomparetheperformanceoftwoFFT-basedjointdetectionalgorithms,namely,OSIC-FFTandSP-FFT.
OSIC-FFT
Orderedsuccessiveinterferencecancellation(OSIC)isaclassicjointdetectionalgorithminTD-SCDMAsystems.InOSIC,usersareorderedaccordingtotheirsignal-to-interference-plus-noiseratio(SINR),andaredetectedonebyone.Duringthedetectionofeachuser,interferencefromthepreviousdetectedusersiscancelledbyOSIC.InOSIC-FFT,theFFTisusedtoacceleratethecalculationofthecorrelationbetweenusersignalsandtheinterference-plus-noisesignals.
ThebasicideaofOSIC-FFTcanbesummarizedasfollows.First,thereceivedsignalistransformedfromthetimedomaintothefrequencydomainbyFFT.TheFFTresultsarethenusedtocalculatethepowerofeachuser'ssignalandinterference-plus-noisesignalineachfrequencybin.Usersarethenorderedbasedontheiraveragepower.Duringthedetectionprocess,theFFTisusedtocalculatethesmallcorrelationbetweenthesignalofthedetecteduserandtheinterference-plus-noisesignalineachfrequencybin.TheFFTisalsousedtocalculatethenewinterference-plus-noisesignalafterthedetectionofeachuser.Thewholedetectionprocesscanbeexpressedasarecursivealgorithm,whichconvergestotheoptimalsolution.
SP-FFT
Simultaneousperturbationstochasticapproximation(SPSA)isastochasticoptimizationalgorithmthatcanbeusedtosolvenonlinearoptimizationproblems.InSP-FFT,SPSAisusedtooptimizethedetectionweightsofjointdetectioninTD-SCDMAsystems.TheFFTisusedtoacceleratethecalculationofthecorrelationbetweenusersigna