甘青半干旱地区大气湍流对无线光通信的影响及信道估计方法研究
Project Number61465007
曹明华
Abstract甘青半干旱地区由于日照时间长、降水量少蒸发量大、昼夜温差大和存在沙尘暴等因素,造成当地的大气湍流环境与国内其他地区有很大差异。而大气湍流导致的无线光通信接收端光强的起伏现象,会严重影响通信的有效性和可靠性。为此,本课题针对甘青半干旱地区的大气湍流,研究无线光通信系统受到的影响及其改善措施。依据湍流信道中光信号受到的影响,推导出该地区的光强起伏特性、脉冲展宽与时延,得到单光束传输时光强的概率分布函数;建立适合于甘青半干旱地区的湍流信道模型,并分析其性能;根据建立的信道模型,分别提出基于训练序列、隐训练序列和依赖数据的隐训练序列的光信道估计方案,并对其中的估计算法、训练序列的设计与选择、叠加训练序列的分离、最佳功率分配等关键技术进行研究。结合PPM调制信号的特点,提出改进方案。该项目取得的研究成果为甘青半干旱地区无线光通信技术的应用与推广提供理论依据。【英文摘要】TheatmosphericturbulenceenvironmentofGansuandQinghaisemi-aridareasismuchdifferentfromthatofotherareasduetomanyfactors,suchasthelongsunshinetime,theprecipitationdeficitandalargerevaporation,thelargetemperaturedifferencebetweendayandnightandrepeatedlyduststormseveryyear.Itwillseriouslyaffectthevalidityandreliabilityofopticalwirelesscommunicationbytheturbulencecausedintensityfluctuationphenomenon.Therefore,thisprojectwillinvestigateitsinfluencetowirelessopticalcommunicationsystemsandfindsomeimprovingmeasurestoovercometheatmosphericturbulenceinthesemi-aridarea.Accordingtotheeffectofopticalsignalinturbulentchannel,wewillderivetheintensityfluctuationcharacteristics,thepulsespreadanddelaypropertiesandtheprobabilitydistributionfunctionofsingle-beamopticaltransmissionintensityinthesemi-aridregion;Establishaturbulentchannelmodelsuitableforthesemi-aridareaandanalyzeitsperformance.Accordingtotheestablishedchannelmodel,threekindsofopticalchannelestimationschemeswillbeinvestgated,whicharetrainingsequencescheme,superimposedtrainingschemeanddata-dependentsuperimposedtrainingscheme.Thekeytechnologiesliketheestimationalgorithms,thedesignoftrainingsequence,theseparationofsuperimposedtrainingsequenceandtheoptimalpowerallocationwillbedisscussedMoreover,weshallputforwardtheimprovementschemeaccordingtothecharacteristicsofthePPMmodulationsignal.Theachievementsofthisprojectwillprovidetheoreticalbasisfortheapplicationandpromotionforthewirelessopticalcommunicationtechnologyinsemi-aridareaofGansuandQinghaiprovince.
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 ; 1205 - 光学和光电子学
Host Institution兰州理工大学
Project Funding470000.0
CountryCN
Language中文
Document Type项目
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/64700
Collection计算机与通信学院
Recommended Citation
GB/T 7714
曹明华.甘青半干旱地区大气湍流对无线光通信的影响及信道估计方法研究.2015.
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