简介:AnopticalPPM-CDMAcommunicationsystemwithanopticalhard-limiterinfrontofthecorrelatorofareceiverisproposedinordertoreducemulti-userinterference.Theperformanceofthesystemisevaluatedwhentheeffectsofbothmulti-userinterferenceandphotodetectorshotnoiseareconsidered.Anupperboundonthebiterrorrateisderived.ThecomparisonoftheperformanceoftheabovereceiverwiththatoftheopticalPPM-CDMAsystemwithoutanopticalhard-limiterismade.Simulationresultsshowthattheperformanceofthesystemwithanopticalhard-limiterissuperiortothatoftheconventionalone.