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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 Multirate 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 | Abstract: | 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. |
URI: | https://scholarhub.balamand.edu.lb/handle/uob/2330 | Ezproxy URL: | Link to full text | Type: | Journal Article |
Appears in Collections: | Department of Electrical Engineering |
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