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Title: Multirate optical fast frequency hopping CDMA system using power control
Authors: Inaty, Elie 
Shalaby, Hossam M. H.
Fortier, Paul
Rusch, Leslie A
Affiliations: Department of Electrical Engineering 
Keywords: Fiber Bragg grating (FBG)
Multimedia network
Multirate optical frequency hopping code division multiple access(OFFH-CDMA)
Power control function
Issue Date: 2002
Part of: IEEE journal of lightwave technology
Volume: 20
Issue: 2
Start page: 166
End page: 177
This paper addresses the problem of real-time multimedia transmission in fiber-optic networks using code division multiple access (CDMA). We present a multirate optical fast frequency hopping CDMA (OFFH-CDMA) system architecture using fiber Bragg gratings (FBGs). In addition, we argue that, in multimedia applications, different services have different quality of service (QoS) requirements; hence, the user only needs to use the minimum required power to transmit the signal, such that the required signal-to-interference ratio (SIR) is met. We show that a variable bit rate optical communication system with variable QoS can be implemented by way of power control with great efficiency. Present-day multirate optical CDMA systems concentrate on finding the code structure that supports a variable rate system, neglecting the importance of the transmission power of active users on the multiple access interference (MAI) and, therefore, on the system capacity. We assign different power levels to each rate through a power control algorithm using variable optical attenuators, which minimizes the interference and, at the same time, provides variable QoS constraints for different traffic types. Although we are using a code family that preserves good correlation properties between codes of different lengths, simulations show a great improvement in the system capacity when power control is used.
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Electrical Engineering

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