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Title: On the cutoff rates of a multiclass OFFH-CDMA system
Authors: Inaty, Elie 
Shalaby, Hossam M. H.
Fortier, Paul
Affiliations: Department of Electrical Engineering 
Keywords: Cutoff rate
Fiber Bragg grating (FBG)
Multimedia network
Optical frequency-hopping code-division multiple access (OFFH-CDMA)
Overlapping coefficient
Issue Date: 2005
Part of: IEEE transaction on communications
Volume: 53
Issue: 2
Start page: 323
End page: 334
We consider an optical code-division multiple-access (OCDMA) network that supports multiple traffic classes. Each class has different processing gain and performance requirements. In this paper, a new method is proposed to analyze the cutoff rates for a multiclass, multirate optical frequency-hopping code-division multiple-access system using fiber Bragg gratings and direct detection. This approach exploits the linear structure of passive OCDMA systems and the nominal time required to accomplish the encoding-decoding operations in such systems. A system model is presented and analyzed, based on a newly introduced bit-overlap procedure. An expression for the cutoff rate of a single-class system is derived. In addition, for a multiclass system, an expression that relates the cutoff rates of the offered classes is introduced, and it is called the service curve. It is shown that for a required quality of service guarantee, a number of active users, and a given probability of hit, the system's data rate can be increased beyond the nominal limit imposed by the physical constraint of the encoder-decoder set.
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Electrical Engineering

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