IR
基于MC-CDMA的室内可见光通信系统设计与性能分析
Project Number61461026
贾科军
Abstract在室内可见光通信中,码间干扰和背景噪声极大地限制了系统的传输速率,降低了系统的性能。CDMA多址接入能力强抗干扰性好,OFDM在抗多径效应引起的码间干扰有固有优势。因此,课题拟引入多载波CDMA技术在室内环境下的LED多用户可见光通信中开展研究。首先针对光OFDM调制方法的多样性,对光OFDM调制方法及性能对比研究,结合扩频序列特性,提出一种光O-OFDM-CDMA系统。在此系统下,对因为要得到正实数序列和非理想LED所引起的非线性削波噪声的统计特性和对系统性能影响进行研究;其次,研究降低峰均比来减小削波噪声和LED非线性失真的方法。在此基础上,基于正交互补序列集与准正交序列构造准正交互补序列集,提高系统接入能力和降低多用户干扰。通过理论分析与仿真对提出方案的可行性和优越性进行论证。【英文摘要】Intheindoorvisiblelightcommunicationsystem,thetimedispersionoftheopticalwirelesschannelsetupamajorthroughputlimitingfactorforthtsystemsbecauseofthesevereinter-symbolinterferenceathighdatarates,andtheadditivebackgroundnoisedegradestheperformanceofthesystem.Codedivisionmultipleaccess(CDMA)isastrongcandidatetosupportmulti-usersservice.AwellknownmodulationtechniquewithaninherentrobustnesstomultipathdispersionistheOrthogonalfrequency-divisionmultiplexing(OFDM)transmissionscheme.ThereforethisworkproposesforindoorvisiblelightcommunicationsystemcombinesOFDMsignalswithCDMAmulti-usercapabilities.Firstly,becauseofthediversityofopticalOFDM,wewillresearchtheperformancecomparisonbetweendifferentmethods.So,wewillproposetheexcellentcombinestheCDMAwithopticalOFDM.Secondly,intheopticalMC-CDMAsystemthetimedomainsignalenvelopisutilizedtomodulatetheLED.Forthispurpose,thesignalneedstoberealandnon-negative.Thusclippingthesignalatzeroinducesthenon-linearnoise,andwewillstudythestatisticcharacteristicsandanalysestheinfluencingfactorofthesystem.ThenthePAPRreductiontechniquesareusedtodegradetheclippingnonlinearnoiseinopticalMC-CDMA.Thenthequasi-orthogonalcomplementarysequencesaredesignedbasedontheorthogonalcomplementarysequencesandquasi-orthogonalsequences.Finally,wewillconducttheoreticalanalysesandsimulationexperimentstofurthersupportourpoints.
Subtype地区科学基金项目
Project Source国家自然科学基金
2015-01
End Date2018-12
MOST Discipline Catalogue12 - 信息科学 ; 1201 - 电子学与信息系统
Host Institution兰州理工大学
Project Funding430000.0
CountryCN
Language中文
Document Type项目
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/64702
Collection兰州理工大学
Recommended Citation
GB/T 7714
贾科军.基于MC-CDMA的室内可见光通信系统设计与性能分析.2015.
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