Comparative Analysis of Different Performance Enhancement Techniques in 2-D Atmospheric OCDMA System

In this paper, a comparative analysis of various performance enhancement techniques in two-dimensional (2-D) atmospheric optical code division multiple access (OCDMA) system is studied in presence of beam divergence, multiple access interference (MAI), noise and atmospheric turbulence. Lognormal and gamma-gamma probability density functions (pdfs) are considered for evaluating fading process due to atmospheric turbulence. Further, double hard limiters, spatial diversity and error correcting code (ECC) are used for performance improvement of the 2-D atmospheric OCDMA system. Double hard limiters and ECC improve performance substantially as compared to spatial diversity. In addition, double hard limiters are cost-effective than the spatial diversity and ECC. Thus, double hard limiters are superior to the other performance improvement techniques in 2-D atmospheric OCDMA system.