Code for spectral amplitude coding optical CDMA systems

Unipolar codes for spectral-amplitude-coding optical CDMA systems based on projective geometries

“…Two such classes of OOC, namely MFH [3], [6], [7], and MQC [4], [6], [7], have been proposed recently. However, our code families have much larger flexibility in choosing the number of users.…”

“…It was initially proposed in [1], however, with neither specific construction nor a specific application. In [4], the PGs were proposed for SAC optical CDMA systems, but no construction was given, and finally in [6], two PG constructions [8] were proposed with not necessarily ideal in-phase cross correlation (the example , , given in [6] has the in-phase cross correlation equal to three.) The first construction given in [6] requires solving a system of equations in Gallois field ( -a prime power, ).…”

Performance Evaluation Analysis of Wavelength/Time 2-D Modified Double Weight Code in OCDMA

“…2-D MDW code which have fixed in-phase spectral crosscorrelation equal to '1' signature sequences to reduce the effect of PIIN and removing MAI and offers an enhanced performance for the family of MDW codes [9]. 2-D MDW code is envisioned as a possible solution to overcome the limitation of 1-D wavelength -time OCDMA codes that improved a high numbers of users a result BER improvement [10].…”

Feasibility Study of SOA-Based Noise Suppression for Spectral Amplitude Coded OCDMA

“…Beat-noise reduction in SAC OCDMA systems has been investigated by a number of groups [9]- [11] who have focused on developing code families with minimal in-phase cross correlation between channels in order to reduce the total amount of interchannel beating at each detector. This is achieved by generating codes with reduced weight (the number of "ones" in each code sequence) relative to code length.…”