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1、西南交通大學(xué)研究生學(xué)位論文光碼分復(fù)用(,OCDlVlA)系統(tǒng)碼間干擾問題研究年姓級(jí)二00哩絲名丁鱟申請(qǐng)學(xué)位級(jí)別專碩士業(yè)通堡墨堡：墾墨絲指導(dǎo)教師鲞鑒塾絲二OO七年四月西南交通大學(xué)碩士研究生學(xué)位論文第1J頁AbstractFiber-opticalcodedivisionmultipleaccess(OCDMA)systemisOneofresearchinghotspotandstandbyschemeinopticalcommunicationnetworks，becauseitcansupplyevenmorebandwidthandmorerapidsi
2、gnaldisposalspeedthanelectricalsystems．TherearemanywaysaccountfortheimpactofMAX9forexample，thechoosingofaddresses：OOC’S，primecodesandimprovedcodes，Manchester'scodes，andSOon；Alsoitcanincreasingdifferentopticalparts：opticalswitchesandopticalhardlimiters(0Hl乒Thisarticlewouldputforward
3、resolvedwaysinallusiontoopticalreceiverforeliminatingMAl．Thedoubleopticalhard-limiterswereproposedforoptimizingsystem'stransferperformance．Thenthebiterrorprobabilityfortheopticalsystemswasimprovedmuchhighly．TheidiographicworksareFirst,indomainamplitudecodeopticalCDMAsystem，itwasuse
4、dopticalorthogonalcodes(ooc’S1asaddressanddetectingdirectly,consideringhotandAPDnoise．Throughnumericalanalysis，thispaperpresentstherelationsofOOCparameters，user’Snumber,throughputopticalpowerandthesystem’Sbiterrorprobability．ThispaperproposedreceiverwithdoubleOHLcomparingwiththerec
5、eiverwithoutorwithonlyOHLonthebitenrorprobability．Secengdly,indomainamplitudecodeopticalCDMAsystem，Itwasusedbysinglemodefiber(sMf)anddispersivecompensatefiber①CV)fordiminishinggroupdispersionandMAI．Thelast，infrequency—hopping／time·speadingopticalCDMAsystem，usingcodesbasedOnOOC’Sand
6、analyzingMAIinallusiontoabovesystemmodel．Throughnumericalanalyzing,theeffectofgroupdispersion，theavailablemeasurescanbeproposedforimprovingperformance．Theresultsshowed：thebiterrorprobabilityoftheOCDMAsystem’Sreceiverwithoutandwithonly0HLWascontiguousanddescendedlittle，SOitWaspropos
7、edthedecoderwithdoubleOHUSforimprovingthesystem'sperformance．Thebitel'fOrprobabilityofsystemwithdoubleOHL，Swasmuchsmallerthanthesingleandhadminimumofthetwosystemswhenaccessinguser’snumberNWasbiggerthan西南交通大學(xué)碩士研究生學(xué)位論文第lII頁thecodeweightk．Otherwise，thebiterrorprobabilityofthesin出eOHLs
8、ystemhadminimumbecausethes
