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

Volume

23

Issue

10

fYear

2005

Firstpage

3339

Lastpage

3346

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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2005.856287

Filename

1522422