Abstract

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. In this work, 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.

© 2002 IEEE

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  1. T. D. C. Little and A. Ghafoor, "Network considerations for distributed multimedia object composition and communication", IEEE Network Mag. , vol. 4, pp. 32-49, Nov. 1990.
  2. J. G. Zhang, "Flexible optical CDMA networks using strict optical orthogonal codes for multimedia broadcasting and distribution applications", IEEE Trans. Broadcast., vol. 45, pp. 106-115, Mar. 1999 .
  3. S. Maric, O. Moreno and C. J. Corrada, "Multimedia transmission in fiber optical LAN's using optical CDMA", J. Lightwave Technol., vol. 14, pp. 2149-2153, Oct. 1996.
  4. T. Ohtsuki, "Performance analysis of direct-detection optical asynchronous CDMA systems with double optical hard-limiters", J. Lightwave Technol., vol. 15, pp. 452-457, Mar. 1997.
  5. H. Fathallah, L. A. Rusch and S. Larochelle, "Passive optical fast frequency hop CDMA communication system", J. Lightwave Technol., vol. 17, pp. 397-405, Mar. 1999.
  6. L. Chen, S. Benjamin, P. Smith and J. Sipe, "Ultrashort pulse reflection from fiber gratings: A numerical investigation", J. Lightwave Technol., vol. 15, pp. 1503-1512, Aug. 1997.
  7. E. Inaty, H. M. H. Shalaby and P. Fortier, "Multirate optical CDMA: System architecture and management", Ph.D. dissertation, Laval University, Quebec, QC, Canada,
  8. A. Lempel and H. Greenberger, "Families of sequences with optimal Hamming correlation properties", IEEE Trans. Inform. Theory, vol. 20, pp. 90-94, Jan. 1974.
  9. J. A. Salehi and C. A. Brackett, "Code division multiple-user techniques in optical fiber networks-Part I", IEEE Trans. Commun., vol. 37, pp. 824-833, Aug. 1989.
  10. L. Bin, "One-coincidence sequences with specified distance between adjacent symbols for frequency-hopping multiple access", IEEE Trans. Commun., vol. 45, pp. 408-410, Apr. 1997.
  11. A. A. Shaar and P. A. Davies, "A survey of one-coincidence sequences for frequency-hopped spread spectrum systems", IEE Proc., vol. 131, no. 7, pp. 719-724, Dec. 1984.
  12. L. Cooper, Applied Nonlinear Programming for Engineers and Scientists, Englewood, NJ: Aloray, 1974.

J. Lightwave Technol. (4)

S. Maric, O. Moreno and C. J. Corrada, "Multimedia transmission in fiber optical LAN's using optical CDMA", J. Lightwave Technol., vol. 14, pp. 2149-2153, Oct. 1996.

T. Ohtsuki, "Performance analysis of direct-detection optical asynchronous CDMA systems with double optical hard-limiters", J. Lightwave Technol., vol. 15, pp. 452-457, Mar. 1997.

H. Fathallah, L. A. Rusch and S. Larochelle, "Passive optical fast frequency hop CDMA communication system", J. Lightwave Technol., vol. 17, pp. 397-405, Mar. 1999.

L. Chen, S. Benjamin, P. Smith and J. Sipe, "Ultrashort pulse reflection from fiber gratings: A numerical investigation", J. Lightwave Technol., vol. 15, pp. 1503-1512, Aug. 1997.

Other (8)

E. Inaty, H. M. H. Shalaby and P. Fortier, "Multirate optical CDMA: System architecture and management", Ph.D. dissertation, Laval University, Quebec, QC, Canada,

A. Lempel and H. Greenberger, "Families of sequences with optimal Hamming correlation properties", IEEE Trans. Inform. Theory, vol. 20, pp. 90-94, Jan. 1974.

J. A. Salehi and C. A. Brackett, "Code division multiple-user techniques in optical fiber networks-Part I", IEEE Trans. Commun., vol. 37, pp. 824-833, Aug. 1989.

L. Bin, "One-coincidence sequences with specified distance between adjacent symbols for frequency-hopping multiple access", IEEE Trans. Commun., vol. 45, pp. 408-410, Apr. 1997.

A. A. Shaar and P. A. Davies, "A survey of one-coincidence sequences for frequency-hopped spread spectrum systems", IEE Proc., vol. 131, no. 7, pp. 719-724, Dec. 1984.

L. Cooper, Applied Nonlinear Programming for Engineers and Scientists, Englewood, NJ: Aloray, 1974.

T. D. C. Little and A. Ghafoor, "Network considerations for distributed multimedia object composition and communication", IEEE Network Mag. , vol. 4, pp. 32-49, Nov. 1990.

J. G. Zhang, "Flexible optical CDMA networks using strict optical orthogonal codes for multimedia broadcasting and distribution applications", IEEE Trans. Broadcast., vol. 45, pp. 106-115, Mar. 1999 .

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