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ID:32131654
大小:7.36 MB
页数:54页
时间:2019-01-31
《关于stm32的室内led可见光通信系统分析》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、山东大学硕士学位论文ABSTRACTWiththedevelopmentofall—opticalcommunicationtechnologyandpeople’Sgrowingdemandsforbroadbandmobilecommunications.thewirelessopticalcommunicationtechnologyhasbeenagreatconcern.Ithasalargeinformationcapacity,lowcost,flexibilityandeasymaintena
2、nce.Itisabroadbandwirelessaccesstechnologythatcombineswirelesscommunicationstechnologyandopticalcommunicationtechnology.Lightsignalsworkastheinformationcarrierandatmosphereworksastheinformationtransmissionmediumtotransmitlightsignals.Sincethe20thcentury,the
3、semiconductorlightingtechnologyhasdevelopedveryrapidly.Itisknownasthe”greenlight”.LEDshavemanyadvantagesoverincandescentlightsourcesincludinglowerenergyconsumption,longerlifetime,improvedphysicalrobustness,smallersize,andfasterswitching.Itworksasthelightsou
4、rceoftheopticalcommunicationsystembecauseofitsshortresponsetime,high-speedlight-emittingresponseandhigh-speedmodulation.GermanphysicistHaratdHaasandhisteaminUniversityofEdinburghinventedapatentedusingtheLEDlighttechnology.Theinvisiblenetworksignaldependento
5、nasmalllampbecomes”visible”networksignal.Visiblelightcommunicationssignalsworkbyswitchingbulbsonandoffwithinnanoseconds,whichistooquicklytobenoticedbyhumaneyes.Inthispaper,anindoorLEDvisiblelightcommunicationsystemisdesignedusingLEDasacommunicationsource.So
6、urcetransmittedthroughserialcommunicationtotheMCUwhereitismodulated.Themodulatedelectricalsignalsworkbyswitchingbulbsonandoffwithinnanoseconds,whichistooquicklytobenoticedbythehumaneye.Theopticalsignalprojectedonthephotodetectorthroughfreespace,theFresnelle
7、nsandthefilter.Thephotodetectorconvertsthereceivedopticalsignalintoanelectricalsignal.Afterequalization,judgmentsanddecodingprocesstorestoretheinformationtransmittedtothecomputeronthereceivingend.Afterreductionanddecodingprocess,theelectricalsignalistransfe
8、rredtothecomputer.Thispaper山东大学硕士学位论文analyzestheprincipleoftheindoorLEDvisiblelightcommunicationsystem,designstheoverallprogramandcompleteserialdatacommunicationsection,poweramplificationsection,thedri
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