基于分段代价函数的新双模式空间分集均衡器-论文.pdf

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1、JournalofNanchangInstituteofTechnologyISSN1674-007608／14PP44—48Voloume33，Number1，February2014Newdual--modeSpatialDiversityEqualizerbasedonsegmentcostfunctionGAOHuijuan，HEXueqiang，DAIGuoxing2(1．SchoolofInformationEngineering；2．ScholofInternationalEducation，N

2、anchangInstituteofTechnology，Nanchang330099，China)Abstract：Inthispaper，anewdual·modeSpatialDiversityEqualizer(SDE)basedonsegmentcostfunctionisproposedtovemomesignalfadingandinter-symbolinterference(ISI)simultaneously．ThekeyalgorithmoftheproposedSDEconsistso

3、ftheconstantmodulusalgorithm(CMA)basedonsegmentcostfunctionandthemulti—modulusalgorithm．Forthehigh．orderQAMsignals，theproposedSDEcanobtainlowersteady—statemeansquareerrorandfasterconvergenceratecomparingwith山etraditionalSDE．Theeficiencyoftllemethodisprovedb

4、ycomputersimulationsinunderwateracousticchannels．Keywords：spatialdiversityequalizer；segmentcostfunction；constantmodulusalgorithm1Intl0ducti0nWhenthedigitalsignalsaretransmittedoverbandlimitedunderwateracousticchannels，thereisaseriouslyproblem，i．e．theinter-s

5、ymbolinterference(ISI)．Traditionally，thechannelequalizationisusedtoovercometheISI．andrecoverthetransmittedsymbolsaccurately．AndaneficientmethodtoovercomeISIinunderwateracousticchannelsisspatialdiversityusedinconjunctionwithadaptiveequalization，whichiscaledS

6、patialDiversityEqualizationorSpatialDiversityEqualizer(SDE)．AnoptimumSDEusinglinearordecisionfeedbackequalizationhasbeenpresentedbyBalabanandSalz¨-2j．Thenumericalresultsshowthatthedualdiversitycombiningandequ。zationcanprovideabouttwoorders—of-magnitudeimpro

7、vementintheaverageerrorrateorinoutageprobability．VenkataramanhasanalyzedthreeclassesofSDEstructures．andproposedanewonewhichhaslowercomputa—tionalcomplexityandbetterperformance．InRef．[4—6]，SDEshavebeenappliedtounderwatercommunication，DTVandwirelesscommunicat

8、ionrespectively．AndrecentlytheSDEisusedinwaveletneuralnetwork【．orthogo—nalwavelettransformation[81andunderwateracousticcommunicationswithadaptiveMMSEturboequalization[．Itisnotedthatthevastmajorityofexi