Cardinality improvement of Zero Cross Correlation (ZCC) code for OCDMA visible light communication system utilizing catenated-OFDM modulation scheme

In this paper, we proposed a new OCDMA-VLC system design utilizing new modulation scheme known as catenated-OFDM (orthogonal frequency division multiplexing) technique. The catenated-OFDM-OCDMA-VLC system is demonstrated by implementing Zero Cross Correlation (ZCC) code. ZCC code is the preferred code generation in OCDMA system as the effect of multiple access interference (MAI) can be cancelled out due to reduction in Phase Intensity Induced Noise (PIIN). In particular, the use of catenated-OFDM and its application in intensity modulation and direct detection fiber optic visible light communication link is theoretically investigated by taking into account all the noises contribute in the visible light spectrum. The theoretical results demonstrated that cardinality enhancement with doublefold, triplefold and fourfold increase in number of user for (Band = 2), (Band = 5) and (Band = 8) respectively compared to previous ZCC-VLC system designs. The results also indicates a good performance with high data rate up 10Gbps using proposed system which is predicted to be new considerable for upcoming OCDMA-VLC mobile communication system design.