A Novel Mapping Technique for an Adaptive Length of Codes in SAC-OCDMA Systems.

In this paper an adaptive mapping technique (AMT) is proposed for spectral amplitude coding-optical code division multiple access (SAC-OCDMA) system. The main purpose of the proposed technique is to construct codes whose length varies adaptively with the number of users. This task can be easily accomplished by successive offsets of the basic code matrix. The important benefit is that all the codes resulting from this technique have a zero cross-correlation property even if the basic code matrix doesn't check it. Therefore, the AMT technique effectively reduces both MAI and PIIN. SAC-OCDMA system employing AMT is mathematically analyzed and then numerically simulated using Matlab. The results show the improvement given by this mapping technique to the SAC-OCDMA system. It illustrate that the proposed mapping technique can supports more users with a higher bit rate compared to the existing mapping techniques in the literature. The advantages of this technique have made it a compelling candidate for future OCDMA applications. [ABSTRACT FROM AUTHOR]