無線擴頻集成電路開發(fā)中信道編解碼技術(shù)研究與FPGA實現(xiàn).pdf

1、東南大學碩士學位論文無線擴頻集成電路開發(fā)中信道編解碼技術(shù)研究與FPGA實現(xiàn)姓名：黃文海申請學位級別：碩士專業(yè)：信號與信息處理指導教師：趙力20050401壘!!塑生AbStraCtThethesismainlydiscussestllechannelcodin∥decodingalgoritlImsofthedesignof山espreadspec仃1LmASICchipa11dresearchestheⅡuthalldmelhods“

2、FPGArealivanonreladvelvNowadays，tlleIEEE80211bstandardforwirelessareanetworksuggest印plyt11eSStechnlqueintonsphysicslayerundersuchcirclllllstallce，ittsofgreatsigllincancetodevclopthespreadspecⅡ1lmASICcIlipThespreadspcc虹Ll

3、m(SS)communicationsystemhassⅡDngabili哆ofresistinginte—brencethanthatofconserv撕oncommunic撕onsvstemsAnditalsohasthecharacterisbcsofIowprobabiliyofinterceptandmllltipleaccesssecurecommunicaⅡonThecharacteristicofwireIesschan

4、nelisveryin仃icacySo，channelcodingisanobligatoIyaIldveryimpoItaIltmethodsofc址p’improVedsteadinessWimtheunderstandofthet11eoryofspreadspec蟣lmcommunicadon，achallIlelcodingscheme—百eriescascadingcodeandt、viceinterlea“ng，isin仃

5、oducedinthepaperTheseriescascadingcodeismakeupofoutercodr(15，9，4)Recd—solomoncode，aIldi衄ercode一(3，l，2)convoluti伽alcodeTheinterleavingisb10ckinterleavingwllichdegrceis4Adetaileddiscussionofthebm伊domainiter撕ondecodingakori

6、tllmofReed—solomoncodeaIldtheⅥterbidecodingalg謝岫ofconv01utionalcodeisgivenAt1ast，thefouncIionsimulationofthechallIleledcode“decoderaIldthememodsofFPGArealivacionsarecompletedillthepeperItisshownbycomputcrsimulationthattl

7、lisch蛐elcodingschemecouldpreferablyimprovethesynb01errorrateofthesimula石onsystemTllisp印erisaITaI】gedasfollo、ving：ChapterlmailllyiIltroducest11ehistoryandbackgmllIldoftheSScommunica石onsystemandtIledeVelopmentrelatedtoSSAS

8、ICcllipatpresentintheworldItalsoin廿oducestheoutlineoftllesisChapter“ⅣodescribesthebaseprincipleoftheSScommunicationsystem，曲cludingthede商flibon，tIlemeorehcfoIlIldation，andclassmc撕onoftheSScommunlcationsystem，aIldmathemahc

9、alaspectofthedirectsequenceSS(DSSS)Ch印ter3ill打oducesthetheo姒classes，柚dcharacteristicofchannelcodingInChapter4，weca“_youttIleselectedchannelcodiIlgscheme，discusst11etheo吼encodingalgorimm，allddecodingalg耐thmofReed—Solomonc

10、odeandconVolutionalcodeAtlastofChapter4，wegivethcparametersoftheselectedch舢e1codingschemeThesymbole丌orrateoftllesyst。驢w矗hchamlelcodingiscaculatedbycomputersimulationinCh印ter5toshowtlleperfb加a11ceTheideaaIldsolubonsfordev

11、elopingtheSScommunic撕onsystemusingFPGAaregiveninthech印ter6ThesecⅡonin廿oducesthedevelopmentnowofFPGAandthetoolsfort11eprojectThentheanalysisandthelmplementdetailf打chaIlIlelcodin∥decodingmodules，both仃ansminer鋤dreceiverunit

12、，areglveninthesectionThesummaryofthetheslsaIldthepossibIeextensionsandlmprovementsbasedontheDSSSsystemarepresentedinthechapter7Keywords：SpreadspectmmcommunicationchannelcodingReed—S010moncodeconVolutionalcodeⅥterbidecodi