光码分复用OCDMA系统码间干扰问题研究

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1、西南交通大学研究生学位论文光码分复用(,OCDlVlA)系统码间干扰问题研究年姓级二00哩丝名丁鲎申请学位级别专硕士业通堡墨堡：垦墨丝指导教师鲞鉴塾丝二OO七年四月西南交通大学硕士研究生学位论文第1J页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西南交通大学硕士研究生学位论文第lII页thecodeweightk．Otherwise，thebiterrorprobabilityofthesin出eOHLs

8、ystemhadminimumbecausethes