DOA Estimation for MC-CDMA Uplink Transmissions

  • Antonio Alberto D’Amico
  • Michele Morelli
  • Luca Sanguinetti
Conference paper
Part of the Lecture Notes Electrical Engineering book series (LNEE, volume 1)

Abstract

We consider the uplink of an MC-CDMA network and assume that the base station is endowed with a uniform linear array. Transmission takes place over a multipath channel and the goal is the estimation of the directions of arrival (DOAs) of the signal from the active users. In a multi-user scenario difficulties are due primarily to the large number of parameters involved in the estimation of the DOAs which makes this problem much more challenging than in single-user transmissions. The solution we propose allows estimating the DOAs of different users independently, thereby leading to significant reduction in the system complexity. In the presence of multipath propagation, however, estimating the DOAs of a given user through maximum likelihood methods remains a formidable task since it involves a search over a multidimensional domain. Therefore, we look for simpler solutions and discuss two alternative schemes based on the SAGE and ESPRIT algorithms.

Keywords

Microwave Covariance 

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References

  1. [1]
    Z. Lei and T. J. Lim. Estimation of Directions of Arrival of Multipath Signals in CDMA Systems. 48:1022–1028, June 2000.Google Scholar
  2. [2]
    A. A. D’Amico, U. Mengali, and M. Morelli. Joint DOA and Channel Parameter Estimation for Code-Division Multiple-Access Systems. 2005.Google Scholar
  3. [3]
    M. Wax and A. Leshem. Joint Estimation of Time Delays and Directions of Arrival of Multiple Reflections of a Known Signal. 45:2477–2484, Oct. 1997.Google Scholar
  4. [4]
    A.-J. van der Veen, M. C. Vanderveen, and A. Paulraj. Joint Angle and Delay Estimation Using Shift-Invariance Techniques. 46:405–418, Feb. 1998.Google Scholar
  5. [5]
    L.C. Godara. Application of Antenna Arrays to Mobile Communications, Part II: Beam-Forming and Direction-of-Arrival Considerations. In Proceedings of IEEE, volume 85, pages 1195–1245, Aug. 1997.Google Scholar
  6. [6]
    L. Sanguinetti and M. Morelli. Channel Acquisition and Tracking for MC-CDMA Uplink Transmissions. IEEE Trans. Vehicular Technology, 55:956–967, May 2006.CrossRefGoogle Scholar
  7. [7]
    J. A. Fessler and A. O. Hero. Space-Alternating Generalized Expectation-Maximization Algorithm. 42:2664–2677, Oct. 1994.Google Scholar
  8. [8]
    R. Roy and T. Kailath. ESPRIT-Estimation of Signal Parameters Via Rotational Invariance Techniques. IEEE Trans. Acoustic, Speech, Signal Processing, ASSP-37:984–995, July 1989.Google Scholar
  9. [9]
    M. Morelli. Timing and Frequency Synchronization for the Uplink of an OFDMA System. 52:296–306, Feb. 2004.Google Scholar
  10. [10]
    P. Stoica and R. Moses. Introduction to Spectral Analysis. Englewood Cliffs, NJ: Prentice-Hall.Google Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • Antonio Alberto D’Amico
    • 1
  • Michele Morelli
    • 1
  • Luca Sanguinetti
    • 1
  1. 1.Department of Information EngineeringUniversity of PisaPisaItaly

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