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Title: Optical S-ALOHA/CDMA systems for multirate applications : architecture, performance evaluation, and system stability
Authors: Raad, Robert
Inaty, Elie 
Fortier, Paul
Shalaby, Hossam M. H.
Affiliations: Department of Electrical Engineering 
Department of Electrical Engineering 
Keywords: Fiber Bragg grating (FBG)
First exit time (FET)
Optical link layer
Overlapped code division multiple access (O-CDMA)
Slotted ALOHA
Variable bit rate
Variable processing gain (VPG) code division multiple access (CDMA)
Issue Date: 2006
Part of: IEEE journal of lightwave technology
Volume: 24
Issue: 5
Start page: 1968
End page: 1977
In this paper, a new multirate optical network based on a hybrid slotted-ALOHA (S-ALOHA)/overlapped code division multiple access (O-CDMA) system is proposed as an effective way of integrating multiclass traffic. The key issue in this proposal is to exploit the potential of the optical O-CDMA using fiber Bragg gratings when jointly used with the S-ALOHA protocol in a link layer. The newly proposed system is modeled using a general Markov chain from which both the system throughput and the average packet delay are derived. The system stability passing through a general finite user model is also envisaged. The system is then compared to the classical S-ALOHA/variable processing gain (VPG) CDMA system. Numerical results show that the proposed system outperforms the latter one, especially at high transmission rates. In addition, stability measures demonstrate that the overlapped system tends to be more stable than the VPG system.
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Electrical Engineering

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