Performance analysis of modified prime-hop codes for OCDMA systems with multiuser detectors

This article presents the performance analysis of modified prime-hop codes (MPHCs) proposed by Wen et al. for optical code division multiple access (OCDMA) systems with multiuser detectors. MPHCs have many advantages over prime-hop codes (PHCs), including low complexity of hardware implementation, low power loss and better performance. The systems using MPHCs would benefit from these advantages under a heavy traffic load. To enhance the performances of MPHCs, the multiuser detectors are utilized to mitigate the negative effect of multiple access interference (MAI) in this study. With a combinatorial approach, the performances of the systems using MPHCs and PHCs are analyzed and compared with one another. The factors to be considered in degrading the system performance include MAI, additive optical intensity noise, and the Poisson characteristics of the optical direct detection process. The numeric results indicate that the systems using MPHCs perform much better than those using PHCs, especially with multiuser detectors.