毕业设计_外文文献翻译.pdf

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1、学校代码：10128学号：201020205056本科毕业设计外文文（献翻译题目：PacketHandlingHardwareSupport学生姓名：学院：系别：专业：班级：指导教师：二〇一四年六月内蒙古工业大学本科毕业设计外文文献翻译PacketHandlingHardwareSupport参考文献：TexasInstruments.CC1101Low-PowerSub-1GHzRFTransceiver.www.ti.com.2013TheCC1101hasbuilt-inhardwaresupportforpacketorientedradioprotocols.Intransmitm

2、ode,thepackethandlercanbeconfiguredtoaddthefollowingelementstothepacketstoredintheTXFIFO:AprogrammablenumberofpreamblebytesAtwobytesynchronization(sync)word.Canbeduplicatedtogivea4-bytesyncword(recommended).ItisnotpossibletoonlyinsertpreambleoronlyinsertasyncwordACRCchecksumcomputedoverthedatafi

3、eld.Therecommendedsettingis4-bytepreambleand4-bytesyncword,exceptfor500kBauddataratewheretherecommendedpreamblelengthis8bytes.Inaddition,thefollowingcanbeimplementedonthedatafieldandtheoptional2-byteCRCchecksum:WhiteningofthedatawithaPN9sequenceForwardErrorCorrection(FEC)bytheuseofinterleavingand

4、codingofthedata(convolutionalcoding)Inreceivemode,thepackethandlingsupportwillde-constructthedatapacketbyimplementingthefollowing(ifenabled):PreambledetectionSyncworddetectionCRCcomputationandCRCcheckOnebyteaddresscheckPacketlengthcheck(lengthbytecheckedagainstaprogrammablemaximumlength)De-wh

5、iteningDe-interleavinganddecodingOptionally,twostatusbytes(seeTable27andTable28)withRSSIvalue,LinkQualityIndication,andCRCstatuscanbeappendedintheRXFIFO.1内蒙古工业大学本科毕业设计外文文献翻译Table27:ReceivedPacketStatusByte1(firstbyteappendedafterthedata)BitFieldNameDescription7:0RSSIRSSIvalueTable28:ReceivedPacket

6、StatusByte2(secondbyteappendedafterthedata)BitFieldNameDescription7CRC_OK1:CRCforreceiveddataOK(orCRCdisabled)0:CRCerrorinreceiveddata6:0LQIIndicatingthelinkqualityNote:RegisterfieldsthatcontrolthepackethandlingfeaturesshouldonlybealteredwhenCC1101isintheIDLEstate.1.DatawhiteningFromaradioperspecti

7、ve,theidealovertheairdataarerandomandDCfree.Thisresultsinthesmoothestpowerdistributionovertheoccupiedbandwidth.Thisalsogivestheregulationloopsinthereceiveruniformoperationconditions(ondatadependencies).Real