Please use this identifier to cite or link to this item:
Title: Performance comparison between S-ALOHA and R3T protocols for multirate OFFH-CDMA systems in optical packet networks
Authors: Inaty, Elie 
Raad, Robert
Fortier, Paul
Shalaby, Hossam M. H.
Affiliations: Department of Electrical Engineering 
Department of Electrical Engineering 
Issue Date: 2006
Part of: Journal of optical netwoking
Volume: 5
Issue: 12
Start page: 927
End page: 936
We discuss two newly proposed multiple-access control (MAC) protocols for multirate optical code-division multiple access (OCDMA) networks. The first protocol is slotted ALOHA/optical fast-frequency-hopping code-division multiple access (S-ALOHA/OFFH-CDMA), and the second is round-robin receiver-transmitter/optical fast-frequency-hopping code-division multiple access (R3/OFFH-CDMA). Our main subject is to exploit the potential of the optical fast-frequency-hopping CDMA using a fiber Bragg grating when jointly used with two different MAC protocols in a link layer as an effective way of integrating multirate traffic. The system throughput and the average packet delay are compared for both systems. It is shown that S-ALOHA is better than R3T when the user's activity and the offered load are high, whereas R3T is better for smaller values. Both protocols can be competitive in terms of the system throughput, with the advantage going to the R3T protocol at a moderate offered load. However, the R3T protocol suffers a higher delay mainly because of the presence of additional modes. Finally, the overlapped OCDMA system always outperforms the variable processing gain (VPG) OCDMA system regardless of the protocol used.
Type: Journal Article
Appears in Collections:Department of Electrical Engineering

Show full item record

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.