Journal of Communications and Networks

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Improved Blind Multipath Estimation for Long Code DS-CDMA

  • Published : 2005.09.01
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Abstract

This paper proposes a blind channel estimation scheme for long code direct sequence code division multiple access (DS­CDMA) systems with multipath fading channels. This scheme combines the advantages of Toeplitz displacement and correlation matching methods to achieve improved performance. The basic idea is to remove the effects of noise and interferences with Toeplitz displacement operation and then estimate the multi path channel parameters with the correlation matching method. Simulation results are presented to show that the proposed scheme provides better MSE performance and robustness against the near-far problem.

Keywords

References

  1. E. H. Dinan, B. Jabbari, and G, Mason, 'Spreading codes for direct sequence CDMA and wideband CDMA cellular networks,' IEEE Commun. Mag., vol. 36, no. 9, pp. 48-54, 1998
  2. K. Tang, P. H. Siegel, and L. B. Milstein, 'A comparison of long code versus short spreading sequences in coded asynchronous DS-CDMA systems,' IEEE J. Select. Areas Commun., vol. 19, no. 8, pp. 1614-1624, 2001 https://doi.org/10.1109/49.942522
  3. A. J. Weiss and B. Friedlander, 'Channel estimation for DS-CDMA down-link with aperiodic spreading codes,' IEEE Trans. Commun., vol. 47, no. 10, pp. 1561-1569, 1999 https://doi.org/10.1109/26.795824
  4. M. Torlak, B. L. Evans, and G. Xu, 'Blind estimation of FIR channels in CDMA systems with aperiodic spreading sequences,' in Proc. 31st Asilomar Conf. Signals, Syst., Comput., vol. 1, Nov. 1997, pp. 495-499
  5. S. Buzzi and H. V. Poor, 'Channel estimation and multiuser detection in long-code DS/CDMA systems,' IEEE J. Select. Areas Commun., vol. 19, no.8, pp.1476-1487, 2001 https://doi.org/10.1109/49.942510
  6. Z. Xu and M. K. Tsatsanis, 'Blind channel estimation for long code multiuser CDMA systems,' IEEE Trans. Signal Processing, vol. 48, no. 4, pp. 988-1001, 2000 https://doi.org/10.1109/78.827533
  7. A. M. V. Tripathi and V. Veeravalli, 'Channel acquisition for wideband CDMA signals,' IEEE J. Select. Areas Commun., vol. 18, no. 8, pp. 1483-1495, 2000 https://doi.org/10.1109/49.864012
  8. C. Escudero, U. Mitra, and D. Siock, 'A Toeplitz displacement method for blind multipath estimation for long code DS-CDMA signals,' IEEE Trans. Signal Processing, vol. 49, no. 3, pp. 654-665, 2001 https://doi.org/10.1109/78.905897