New Method for the Construction of Optical Zero Cross Correlation Code Using Block Matrices in OCDMA-OFDM Systemn Code Using Blocks Matrices in OCDMA-OFDM System

Abstract

In order to increase the number of users and data rate, and to reduce the impact of multi access interference (MAI), this study proposes the optical code division multiple access (OCDMA) systems with orthogonal frequency division multiplexing modulation (OFDM) based on a new zero cross correlation (ZCC) code. The OCDMA, a new ZCC-OFDM suggested system, was compared to the OCDMA-FCC (Flexible Cross Correlation)-OFDM in terms of signal to noise ratio (SNR) and bit error rate (BER). The results showed that the proposed system with the new ZCC code improves the system capacity performance by increasing the number of simultaneous users (cardinality) up to approximately 120% as compared to SCM (subcarrier multiplexing) OCDMA-FCC, and up to 7% in comparison to OCDMA-FCC (Flexible Cross Correlation)-OFDM. The adopted system has superior performance by saving around -3 dBm of power at the receiver with better bit error rate in comparison to OCDMA-FCC-OFDM system. In addition, the resulting power due to the increased number of users using our proposed new ZCC code is less in comparison to the FCC code. This improvement is due to the effect of the good auto/cross correlation properties of the new ZCC code.