Performance Improvement of Optical Multiple Access CDMA Network Using a New Three-Dimensional (Spectral/Time/Spatial) Code

• Published in: Wireless personal communications Vol. 118; no. 4; pp. 2675 - 2698
• Main Authors: Alayedi, Mohanad, Cherifi, Abdelhamid, Hamida, Abdelhak Ferhat, Bouazza, Boubakar Seddik, Aljunid, Syed Alwee
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2021; Springer Nature B.V
• Subjects: Code Division Multiple Access; Communication networks; Communications Engineering; Computer Communication Networks; Cross correlation; Engineering; Networks; Noise; Noise intensity; Optical communication; Shot noise; Signal,Image and Speech Processing; Thermal noise; OCDMA; Bit error rate; Phase induced intensity noise (PIIN); Three dimensional single weight zero cross correlation (3D-SWZCC)
• ISSN: 0929-6212; 1572-834X
• DOI: 10.1007/s11277-021-08149-0

In this paper, a novel code named three dimensional single weight zero cross correlation (3D-SWZCC) code has been developed for spectral/time/spatial (S/T/S) encoding in non coherent optical code division multiple access (OCDMA) systems. This novel code is based on one dimensional (1D) and two dimensional (2D) SWZCC code already proposed. According to simulation results, it is really observed that 3D-OCDMA systems employing SWZCC code can resist against both thermal noise and phase induced intensity noise in other words; shot noise can be totally neglected. Mover, the proposed code can improve the system capacity up to 6, 8 and 2.98 times and save the receiver power level to reach − 8.39 dBm and − 1.5 dBm going by from (1D) to (2D) to (3D) respectively as well as this code has outperformed the already existing codes such 3D-perfect difference (3D-PD), 3D-perfect difference/multi diagonal (3D-PD/MD) and 3D-dynamic cyclic shift (3D-DCS/MD) and 3D-MD codes in terms of system’s capacity 4.82, 4.13, 3.75 and 1.29 times respectively that satisfies the optical communication networks requirements. In accordance with simulation results, 3D-OCDMA system based on SWZCC code achieves good performance and meets optical communication requirements due to low BER and high Q-factor it provides, equal to 10 - 27 and 10 dB respectively for 1 Gbps data rate and a distance of 50 km up to 70 km.