ISSN : 1796-2021
Volume : 2    Issue : 3    Date : May 2007

Prime Code Efficiency in DS-OCDMA Systems using Parallel Interference Cancellation
Claire Goursaud-Brugeaud, Anne Julien-Vergonjanne and Jean-Pierre Cances
Page(s): 51-57
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In this paper, we are studying the Prime Codes (PC) efficiency, in direct Sequence Optical Code
Division Multiple Access system (DS-OCDMA) using Parallel Interference Cancellation receiver
(PIC). We develop the analytical expression of the error probability upper bound in the chip
synchronous case, for PC. The main result of our work is that the PIC receiver totally suppresses
the effect of Multiple Access Interference (MAI) for Prime Codes, and leads to an error free O-CDMA
link in the noiseless case, for whichever employed PC. Simulation results are presented to validate
the theoretical analysis. We also show that the PIC receiver permits reducing the required code
length for a given Bit Error Rate compared to the Conventional Correlation Receiver. Finally, we
compare the PC to the Optical Orthogonal Codes (OOC), and show that the use of PC allows a
significant reduction of the required SNR.

Index Terms
Optical Code Division Multiple Access (OCDMA), Prime Codes, Parallel Interference Cancellation