New code with non-zero cross correlation for spectral amplitude coding optical code-division multiple-access systems

Abstract

This paper presented the novel of a new class of code with Non-Zero Cross-Correlation for SpectralAmplitude Coding in Optical Code Division Multiple Access (OCDMA) systems. A new code namely Modified NonZero Cross Correlation Code (MNZCC). MNZCC code can be constructed easily for a given number of users K, weights and for a given cross correlation (Ȝmax). The proposed code was demonstrated in simulation using OptiSys. 6.0 to observe the system performance. The results shown, that, the proposed code has superior performance in term of spectrum efficiency and reducing the effect of MAI and suppressing the effects of PIIN, with better bit error probability. The results are obtained for the MNZCC were compared with others existing optical codes such as DW code.

Optical millimeter wave generation utilizing stimulated brillouin scattering for radio over fiber system

“…Considering the radio-frequency carrier signal as an analog signal, which make up the laser modulation an analog signal too. If frequency conversion is utilized, the modulation may occur at radio signal frequency or any intermediate frequency [3][4].…”

Comparative analysis of FBGs as encoders for optical CDMA systems

“…Further, the code has better performance within the presence of noise. The method of generating a family of zero crosses correlation for given values of k (number of users) and w (weight of the code) consists of the following steps [13]:…”

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

“…The challenges that can see in OCDMA system are improved cardinality, suppress phase induced intensity noise PIIN, and mitigate multiple access interference MAI [2]. However a proper design of 2-D OCDMA could result in auto-correlation with minimum or zero side lobe and cross-correlation small than 1-D OCMA [3].…”