Performance results for optimum demodulation of optical code division multiple access (CDMA) signals are obtained. Upper and lower bounds on minimum probability of symbol error for a K-user, symbol-asynchronous optical CDMA system with optical orthogonal codes (OOCs) are derived and evaluated. An asymptotic efficiency defined relative to the performance in known interference is introduced. The results obtained exhibit the asymptotic efficiency of optimum demodulation and suggest the existence of a significant performance gap between the optimum receiver and the conventional correlation receiver even in mild near-far environments.
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