期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2016
卷号：94
期号：1
出版社：Journal of Theoretical and Applied
摘要：The performance of the incoherent OCDMA system is affected by the multiple access interference (MAI) as well as the phase induced intensity noise (PIIN). A new code structure of the two-dimensional (2-D) code family for OCDMA network system employs the wavelength/time (W/T) coding technique is proposed. By utilizing good cross-correlation properties from both one dimensional (1-D) Flexible Cross Correlation (FCC) and 1-D Modified Double Weight (MDW) codes, this new proposed hybrid code effectively suppresses the PIIN and eliminate MAI. The values of BER have been used to analyze and evaluate the performance of the system based on different data rates (1Gbps and 2.5Gbps). The analysis deliberates the influence of data rates over the number of simultaneous users and effective power. It was found that the increasing of data rates will degrade the quality of the decoded signal due to the rise of the MAI. The numerical results reveal that the performance of the proposed system can be enhanced and support much more simultaneous users compared to 2-D Perfect Difference (PD) and 2-D Diluted Perfect Difference (DPD) codes. In fact, the cardinality of the proposed code indicates the improvements of more than twice as compared to the 2-D PD code. Additionally, the code flexibility of this proposed system also been analyzed. It demonstrates the number of timing chip, N significantly plays a major role in the improvement of performance and the cardinality of the system. The results presented here reveals the importance of data rates and code flexibility in optimizing the system performance.
