可见光通信系统干扰消除技术研究

《可见光通信系统干扰消除技术研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、西安电子科技大学硕士学位论文IIABSTRACTABSTRACTWiththerapiddevelopmentofLED(LightEmittingDiode)technologyandtheincreasingdemandofhigh-speedwirelesscommunication,visiblelightcommunicationtechnologygraduallydevelops.Asanewtypeofwirelesscommunicationmeans,itobtainsthewideattentionofthedomesticandfo

2、reignresearchinstitutionsandscholars,providingaflexiblesolutionforwirelessbroadbandaccessandeffectivelyalleviatingtheincreasinglycrowedspectrumresourcesissuesinwirelesscommunication.Visiblelightcommunicationtechnologyisalsoappliedinintelligenttransportationsystem.WithLEDsastraffic

3、light,visiblelightcommunicationsystemprovidesanewsolutionforITStosolvecommunication.ThepaperisbasedonvisiblelightcommunicationforroadandvehiclewithLEDarray.ThelightsignalemittedbyLEDarrayisintensitymodulated,thereceivercapturesthetransmittingLEDimagesbyhigh-speedcameraanddemodulat

4、esoriginalinformation,completingthevisiblelightcommunication.Drawbackparticulartothesystemisinter-pixelinterference(IPI).DuetodiffusionofLEDandfinitepixelsizeofimagesensor,theLEDaffectsnotonlytheactualcorrespondingpixelbutalsoitssurroundingpixels.Wecallthisphenomenonas“inter-pixel

5、interference(IPI)”anditcausesdegradationinerrorrateperformance.Inthispaper,westudymainlymethodstoeliminatetheeffectofIPI.1.ThepaperproposestwofrequencydomainequalizationalgorithmstoeliminateIPI:zero-forcingfrequencydomainequalizationandminimummeansquareerrorfrequencydomainequaliza

6、tion.Andthebiterrorrate(BER)performanceinwhiteGaussiannoisechannelissimulated.ItcanbeseenthatthesetwofrequencydomainequalizationalgorithmscanbothimprovetheBERperformanceinaseriousIPI.Andbycomparingthesetwoalgorithms,itcanbeseenthatatlowSNR,MMSEequalizationisworsethanzero-forcingeq

7、ualizationinperformanceandathighSNR,MMSEequalizationisbetterthanzero-forcingequalizationinperformance.III西安电子科技大学硕士学位论文2.Thepaperproposesselectingequalizationalgorithm.NoequalizationisbetterthanequalizationinperformanceinalittleIPI.Forthissituation,thepaperpresentsaselectingequali

8、zationalgorithm.Selectingequaliza