资源描述：
《TDD模式下基带信号的位同步算法在DSP上的实现》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、AbstractAbstractTDD(TimeDivisionDuplexing),correspondingtoFDD,isonekindofLTEtechnology.It’sakindofduplexmodeofcommunicationsystem,receivingandtransmittingatthedifferentslotsinthesamefrequencychannel,separatingchannelsofreceivingandtransmittingbyguaranteeingthetime.TDDhasgreatadvant
2、ageonit’sflexibilitythatnothingcancomparewith.Itneedsonlyoneasymmetricfrequencyband,anditcanmakefulluseoftheradiospectrum.TherealtimedemodulationofaQPSKsignalwiththesampleratebetween1Mbpsand2Mbpsisrequiredinthissubject,usingavarietyofdemodulationtechniquestofinallyrecoverythesendin
3、gdata,whileatthesametimekeeptheBERandframeloss7ratetobelessthan10ataswitchingrateof4KHz,whenthere’snonoiseorotherinterference.MATLAB,CCSandothersoftwaretoolsareusedforsimulationinthissubject,andDM6437isusedintheemulationandtheoptimizationofthecode.weusethesymbolsynchronizationtech
4、nologytobuildthewholebasebanddemodulationsystem，removethesymboltimingerrorproducedbythedifferentsamplingtimeofthesendingendandthereceivingend.ThetraditionalGardneralgorithmisusedinsymbolsynchronization,andalsoimprovedonthisbasis.Atlast,evaluatingtheperformanceofthewholesystembyaser
5、iesoferrorcomputing.TheexperimentiscompletedonDM6437,andcache,DMAareenabledinthisalgorithmforoptimizing,sothatthesystemcandemodulateatasamplerateof3Mbps,7whilethebiterrorrateandframelossrateisabout10inboththestateofnoiseofnohigherthan20dBandthestateofphaseerrorofnohigherthan5°.Key
6、words:TDD,symbolsynchronization,DM6437,CCS-II-万方数据目录目录第一章绪论................................................................................................................11.1研究背景及意义..............................................................................................11.1.1
7、研究背景..............................................................................................11.1.2研究意义..............................................................................................11.2国内外发展现状.....................................................................
8、.........................2
