Title :
Experimental and theoretical analysis of the optimum decision threshold for varying numbers of active users in a 2-D time-wavelength asynchronous O-CDMA system
Author :
Saghari, Poorya ; Gholizadeh, R. ; Abrishami, Hamed ; Pakbaznia, E. ; McGeehan, John E. ; Nezam, S. M Reza Motaghian ; Willner, Alan E.
Author_Institution :
Dept. of Electr. Eng. - Syst., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
We experimentally demonstrate the existence of an optimal decision threshold in an optical code-division-multiple-access (O-CDMA) system and show its relation to the number of active users. Our results show that tuning the decision threshold in an O-CDMA receiver to an optimal point based on the number of active users improves receiver sensitivity by > 3 dB. We also demonstrate a monitoring scheme to estimate the number of active users in an O-CDMA system using harmonics of RF clock tones.
Keywords :
code division multiple access; optical fibre communication; optical receivers; 2-D time-wavelength asynchronous O-CDMA system; RF clock tones; optical code-division-multiple-access; optimal decision threshold; receiver; Interference; Monitoring; Multiaccess communication; Optical fiber networks; Optical pulses; Optical receivers; Optical sensors; Optical tuning; Student members; Two dimensional displays; 2-D O-CDMA; Code division multiple access (CDMA); decision threshold; distributions; interference; optical CDMA (O-CDMA); optical communication; optical networking; optical orthogonal codes (OOCs); performance measurement; threshold; two-dimensional (2-D) CDMA;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.856287
