Analysis of a DS-CDMA Return Link for Mobile Satellite Communications

  • Giovanni E. Corazza
  • Riccardo De Gaudenzi
Conference paper


Coded non-coherently demodulated DS-CDMA (Direct-Sequence Code Division Multiple Access) schemes are well suited for the uplink of forthcoming satellite-based personal communication systems. To enhance the coverage and the quality of service low Earth ortbiting (LEO) constellation are usually selected. This implies the presence of large Doppler effect that combined to the frequent mobile channel shadowing makes the uplink closure for hand-held terminals a very challenging task. In this paper the performance of M-ary orthogonal convolutionally coded DS-CDMA is analyzed in depth and its performance compared to the simpler coded differential BPSK scheme. The bit error rate bounds with or withouth satellite diversity and equal gain combining are evaluated over typical LEO satellite fading channels. Different coding rates and soft metrics are considered to optimize the channel performance.


Additive White Gaussian Noise Elevation Angle Code Rate Code Division Multiple Access Diversity Path 
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  1. 1.
    J.E.Hartleid, L.Casey, The Iridium system personal communications anytime, anyplace, Proc. 3rd Int. Mobile Sat. Conf., IMSC93, Pasadena, pp. 285–290, June 1993.Google Scholar
  2. 2.
    R.A. Wiedeman, A.J. Viterbi, “The Globalstar Mobile Satellite System for Worldwide Personal Communications”, Proc. 3rd Int. Mobile Sat. Conf., IMSC’93, Pasadena, pp. 291–296, June 1993.Google Scholar
  3. 3.
    C.J. Spitzer, “Odyssey Personal Communications Satellite System”, Proc. 3rd Int. Mobile Sat. Conf., IMSC’93, Pasadena, pp. 297–302, June 1993.Google Scholar
  4. 4.
    J. Singh, “Inmarsat-P–A Unique Telecommunications Venture”, Proc. AIAA/ESA Workshop on Intl. Coop. in Sat. Commun., ESTEC, Noordwijk, 27–29 March, pp. 45–48, 1995.Google Scholar
  5. 5.
    P. Monte, S. Carter, “The Globalstar Air Interface”, Proc. AIAA Satellite Communication Conference, San Diego, March, pp. 1614–1621, 1994.Google Scholar
  6. 6.
    K.S Gilhousen, I.M. Jacobs, R. Padovani, L.A. Weaver, “Increased Capacity Using CDMA for Mobile Satellite Communications”, IEEE Journal on Selected Areas in Communications, Vol. 8, No. 4, May 1990, pp. 503–514.CrossRefGoogle Scholar
  7. 7.
    A.J. Viterbi, A.M. Viterbi, E. Zehavi, “Perfomance of Power-Controlled Wide-band Terrestrial Digital Communications”, IEEE Trans. on Commun., Vol. 41, N. 4, pp. 559–569, Apr. 1993.CrossRefMATHGoogle Scholar
  8. 8.
    K.S. Gilhousen, I.M. Jacobs, R. Padovani, A.J. Viterbi, L.A. Weaver, C.E. Wheatley, “On the Capacity of a Cellular CDMA System”, IEEE Trans. on Veh. Technol., Vol. 40, N. 2, pp. 303–312, May 1991.CrossRefGoogle Scholar
  9. 9.
    A.J. Viterbi, “Principles of Spread Spectrum Communications”,Addison Wesley,1995.Google Scholar
  10. 10.
    J. Proakis, “Digital Communications”,second edition, Mc Graw Hill International Editions.Google Scholar
  11. 11.
    B.R. Voijcic, R.L. Pickoltz, L.B. Milstein, “Performance of DS-CDMA with Imperfect Power Control Operating over Low Earth Orbiting Satellite Link”, IEEE Journal on Selected Areas in Communications, Vol. 12, No. 4, May 1994, pp. 560–567.CrossRefGoogle Scholar
  12. 12.
    G.E. Corazza, F. Vatalaro, “A Statistical Model for Land Mobile Satellite Channels and Its Application to Nongeostationary Orbit Systems”, IEEE Trans. on Veh. Technol., Vol. 43, N. 3, pp. 738–742, Aug. 1994.CrossRefGoogle Scholar
  13. 13.
    Channel Fading for Mobile Satellite Communications Using Spread Spectrum Signalling and TDRSS“,ITU-R Study Group, Doc. WP 10–115/USA-[C], October 7, 1994.Google Scholar
  14. 14.
    H.F. Harmuth, “Transmission of Information by Orthogonal Functions”,Springer-Verlag: New York, 19721.CrossRefMATHGoogle Scholar
  15. 15.
    N. Ahmed, K.R. Rao, “Orthogonal Transforms for Digital Signal Processing”, Springer-Verlag, 1975.Google Scholar
  16. 16.
    G.E. Corazza, “On the Non-Central X2 Distribution and its Use in Coalmani cation Theory”,, submitted, 1995.Google Scholar
  17. 17.
    M. Abramowitz and I. A. Stegun (ed.), “Handbook of Mathematical Functions,” Dover, 1970.Google Scholar
  18. 18.
    G.E. Corazza, Analysis of the Return Link of a DS-CDMA Satellite Mobile System, ESA/ESTEC tech. rep., EWP n. 1849, Nov. 1995.Google Scholar
  19. 19.
    M. Schwartz, W.R. Bennet, S. Stein, “Communication Systems and Techniques”, McGraw-Hill: New York, 1966.Google Scholar
  20. 20.
    G.E. Corazza, “Closed-Form Distribution for Soft Differential Detection in Fast Rice Fading with Diversity”, submitted, 1996.Google Scholar
  21. 21.
    S. Kotz, N.L. Johnson, D.W. Boyd, “Series representations of distributions of quadratic forms in normal variables I. Central case”, Annals of Mathematical Statistics, Vol. 38, pp. 823–837, 1967.CrossRefMathSciNetGoogle Scholar
  22. 22.
    A.J. Viterbi, “Principles of Digital Communication and Coding”, McGraw-Hill: New York, 1979.MATHGoogle Scholar

Copyright information

© Springer-Verlag London Limited 1996

Authors and Affiliations

  • Giovanni E. Corazza
    • 1
  • Riccardo De Gaudenzi
    • 2
  1. 1.Department of Electronic EngineeringUniversity of Rome “Tor Vergata”RomaItaly
  2. 2.European Space AgencyEuropean Space Research and Technology CentreNoordwijkThe Netherlands

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