HSDPA中F-HARQ技术的FPGA实现-豆柴文库

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HSDPA中F-HARQ技术的FPGA实现
Introduction
High-SpeedDownlinkPacketAccess(HSDPA)isa3Gmobilecommunicationtechnologythatisdesignedtoprovidehigh-speeddatatransferratesonthedownlinkofthecellularnetwork.HSDPAusesarangeofadvancedtechniquestoachievehighthroughput,suchashigher-ordermodulation,adaptivemodulationandcoding,andfastHybridAutomaticRepeatRequest(HARQ)retransmission.HARQiscrucialforachievinghighthroughputinHSDPAbecauseitenablesthebasestationtoquicklyretransmitanymissingdatapackets.
Inthispaper,wewillfocusontheFPGAimplementationofFastHARQ(F-HARQ)technologyintheHSDPAsystem.WewilldiscussthesignificantadvantagesofFPGAimplementationofthistechnology,itsarchitecture,anditschallenges.
F-HARQArchitecture
FastHybridAutomaticRepeatRequest(F-HARQ)technologyisavariantofhybridARQ(HARQ)whichisusedtoimprovetheperformanceofHSDPAnetworks.Thistechnologyusesthefeedbackfromthereceivertoretransmittheerroneouspacketsimmediatelywhilethetransmissionofthesubsequentpacketsisstillinprogress.Thisresultsinasignificantreductionindelayandimprovestheoverallthroughputofthesystem.
F-HARQtechnologyisimplementedintwostages:CombinerandDecoder.TheCombinerstagecombinesthenewdatawiththepreviouslytransmitteddatatocreateanewpacket.TheDecoderstagethendecodesthepacketusingthechannelcodingtechniquesandchecksfortheerrorsinthereceiveddata.
FPGAImplementationofF-HARQTechnology
FPGAtechnologyhasbeenwidelyusedinwirelesscommunicationsystemsduetoitshigh-speedprocessingcapabilities,flexibleconfigurations,andlowpowerconsumption.FPGAimplementationofF-HARQtechnologyoffersseveraladvantagesoverotherapproaches,suchasASICs(ApplicationSpecificIntegratedCircuits)andDSPs(DigitalSignalProcessors).
OneofthesignificantadvantagesofFPGAimplementationistheflexibilityintheconfigurationanddesign.UnlikeASICs,FPGAallowsforeasymodificationsandchangesinthedesigntoimprovetheperformanceofthesystem.Italsooffersflexiblemodulardesign,whichismoresuitableforHSDPAsystems.
AnotheradvantageofFPGAimplementationisthelowpowerconsumption.AsFPGAconsumeslesspower