Multirate optical fast frequency hopping CDMA system using power control

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 multi...

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Bibliographic Details
Published in:Journal of lightwave technology 2002-02, Vol.20 (2), p.166-177
Main Authors: Inaty, E., Shalaby, H.M.H., Fortier, P., Rusch, L.A.
Format: Article
Language:English
Subjects:
Applied sciences
Bit rate
Bragg gratings
Code Division Multiple Access
Exact sciences and technology
Fiber gratings
Fiber optics
Frequency
Frequency hopping
Interference
Multiaccess communication
Multimedia
Multiple access interference
Optical attenuators
Optical fiber networks
Optical fibers
Power control
Preserves
Quality of service
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
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Summary: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.
ISSN:0733-8724
1558-2213
DOI:10.1109/50.983229