移动通信中射线跟踪算法理论与实现的分析

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1、北京邮电大学硕士学位论文移动通信中射线跟踪算法理论及实现的研究关键字：射线跟踪移动通信虚拟源二叉树电波传播预测模型北京邮电大学硕士学位论文移动通信中射线跟踪算法理论及实现的研究RESEARCHOFRAYTRACINGTHEORYANDI迮ALIZATION烈MOBILECOMMUNICATlolNSYSETMABSTRACTPredictionofradiopropagationplaysaveryimportantroleindesignandprogrammingwirelesscommunicationnetw

2、orkinmodemmobilecommunication．Withthefastdevelopmentofdigitalmobilecommunication，andthebestuseoffrequencyspectrum，thesizeofurbancellisgettingsmaller,whichiscalledmicrocellular．Sothestatisticalcomparabilityofdifferentcellfadesawayandthepreviousempiricalpredictio

3、nmodelofradiopropagationwhichbasedonalargeamountofexperimentaldataCallnotbeused．Thereforeanewaccuratepredictionmodelmustbeestablishedtoanalyzetheradiopropagationinmicrocellular．Combiningwithphysicaloptics(PO)，geometrytheoryofdiffraction(GTD)anduniformtheoryofdi

4、ffraction(UTD)，raytracingcanpreciselyandefficientlyfindthepathsofrays，analyzemultipatheffectandcalculatevariouschannelparameters．Raytracingisamethodwhichfitsforpredictingtheradiopropagationinamicrocellular．北京邮电大学硕士学位论文移动通信中射线跟踪算法理论及实现的研究Thispaperprovide!effecti

5、vetracingme。。。‘forpredictionoflluspaperprovidesalletlectlveraytracingmethodforDredictionotmierocelhlarradiopropagation，whichiscalledaraytracingmethodbasedonvirtualsourcebinarytree．ThealgorithmUSeSasimpleandeffectivebinarytreetostoretheinformationofemissionsourc

6、e，reflectionsourceanddiffractionsourceandcallsearchtheaccurateraypathsfromsendingsettoreceivingmachineinacomplexscenariobytraversingthebinarytree．Besides,someacceleratemethodsareusedinthealgorithmtoimprovetheefficiencyofraytracing．Thisalgorithmisonekindofinvers

7、ealgorithms，butitalsocontainstheadvantageofdirectalgorithms．Ithastheaccuracyofinversealgorithmsandthecoverageareaofdirectalgorithms．ThealgorithmisrealizedwithVC++6．0inthispaper．Thispaperhascountedtheelectricwavepropagationpathlossinamieroeelhlarenvironmentmodel

8、andtheresultsverifythevalidityoftheraytracingmethod．KEYWORDS：raytracingmobilecommunicationvirtualsourcebinarytreepredictionmodelofradiopropagation北京邮电大学硕士学位论文移动通信中射线跟踪算法理论及实