Abstract
A direct sequence (DS) spread spectrum code division multiple access (CDMA) communication system is considered where several users transmit data symbols over different multipath channels. The main objective of this work is the proposal of a sequential algorithm for joint parameter estimation and multiuser data detection. The computationally prohibitive maximization of the log-likelihood function is replaced by a sequential scheme using the multistage detector for recovering the data symbols and the expectation-maximization algorithm for estimating the channel parameters. The performance of the resulting multiuser receiver is evaluated via Monte Carlo simulations using both synthetic as well as measured channel impulse responses. A comparison of the performance with analytical expressions for the single-user single-path case shows that the proposed system is capable of eliminating the near-far effect existing in conventional DS/CDMA systems.
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References
S. VerdÚ, “Adaptive multiuser detection”, in Proc. of the IEEE Third Int. Symp. on Spread Spectrum Techniques and Applications (ISSSTA’ 94), Vol. 1, (Oulu, Finland), pp. 47–50, Jul. 4–6 1994.
S. VerdÚ, “Minimum probability of error for asynchronous Gaussian multiple-access channels”, IEEE Trans. Inform. Theory, Vol. IT-32, pp. 85–96, Jan. 1986.
R. Lupas and S. VerdÚ, “Near-far resistance of multiuser detectors in asynchronous channels”, IEEE Trans. Commun., Vol. COM-38, pp. 496–508, Apr. 1990.
M.K. Varanasi and B. Aazhang, “Multistage detection in asynchronous code-division multiple-access communications”, IEEE Trans. Commun., Vol. COM-38, pp. 509–515, Apr. 1990.
Y.C. Yoon, R. Kohno and H. Imai, “A spread-spectrum multiaccess system with cochannel interference cancellation for multipath fading channels”, IEEE J. Select. Areas Commun., Vol. SAC-11, pp. 1067–1075, Sept. 1993.
A. Duel-Hallen, “Afamily of multiuser decision-feedback detectors for asynchronous code-division multiple-access channels”, IEEE Trans. Commun., Vol. COM-43, pp. 421–434, Feb./Mar./Apr. 1995.
Z. Xie, C.R. Rushforth and R.T. Short, “Multiuser signal detection using sequential decoding”, IEEE Trans. Commun., Vol. COM-38, pp. 578–583, May 1990.
A. Klein and P.W. Baier, “Linear unbiased data estimation in mobile radio systems applying CDMA”, IEEE J. Select. Areas Commun., Vol. SAC-11, pp. 1058–1066, Sept. 1993.
L.B. Nelson and H.V. Poor, “Iterative multiuser receivers for CDMA channels: An EM-based approach”, IEEE Trans. Commun., to appear.
M. Honig, U. Madhow and S. VerdÚ, “Blind adaptive multiuser detection”, IEEE Trans. Inform. Theory, Vol. IT-41, pp. 944–960, July 1995.
A. Duel-Hallen, J. Holtzman and Z. Zvonar, “Multiuser detection for CDMA systems”, IEEE Personal Communications, pp. 46–58, Apr. 1995.
H.V. Poor, “On parameter estimation in DS/SSMA formats”, in Lecture Notes in Control and Information Sciences - Advances in Communications and Signal Processing, pp. 59–70, Springer-Verlag, 1989.
Y. Steinberg and H.V. Poor, “Sequential amplitude estimation in multiuser communications”, IEEE Trans. Inform. Theory, Vol. IT-40, pp. 11–20, Jan. 1994.
T. K. Moon, Z. Xie, C.K. Rushforth and R.T. Short, “Parameter estimation in a multiuser communication system”, IEEE Trans. Commun., Vol. COM-42, pp. 2553–2560, Aug. 1994.
P. Jung and B. Steiner, “A joint detection CDMA mobile radio system concept developed within COST 231”, in Proc. 45th IEEE Vehicular Technology Conference, Vol. 1, (Chicago, IL), pp. 469–473, July 25–28 1995.
Z. Xie, C.K. Rushforth, R.T. Short and T.K. Moon, “Joint signal detection and parameter estimation in multiuser communications”, IEEE Trans. Commun., Vol. COM-41, pp. 1208–1216, Aug. 1993.
R.A. Iltis and L. Mailaender, “An adaptive multiuser detector with joint amplitude and delay estimation”, IEEE J. Select. Areas Commun., Vol. SAC-12, pp. 774–785, June 1994.
B. Aazhang, B.-P. Paris and G. Orsak, “Neural networks for multiuser detection in code-division multiple-access communications”, IEEE Trans. Commun., vol. COM-40, pp. 1212–1222, July 1992.
M. Feder and J.A. Catipović, “Algorithms for joint channel estimation and data recovery - application to equalization in underwater communications”, IEEE J. Oceanic Eng., Vol. OE-16, pp. 42–55, Jan. 1991.
U. Fawer and B. Aazhang, “A multiuser receiver for code division multiple access communications over multipath channels”, IEEE Trans. Commun., Vol. COM-43, pp. 1556–1565, Feb./Mar./Apr. 1995.
H.V. Poor, An Introduction to Signal Detection and Estimation. New York, NY: Springer-Verlag, 1988.
J.G. Proakis, Digital Communications. New York, NY: McGraw-Hill, 2nd ed., 1989.
A.P. Dempster, N.M. Laird and D.B. Rubin, “Maximum likelihood from incomplete data via the EM algorithm”, J. Royal Statist. Soc., Ser. B, Vol. 39, no.1, pp. 1–38, 1977.
S. VerdÚ, “Computational complexity of optimum multiuser detection”, Algorithmica, Vol. 4, No.3, pp. 303–312, 1989.
M. Feder and E. Weinstein, “Parameter estimation of superimposed signals using the EM algorithm”, IEEE Trans. Acoust., Speech, Signal Processing, Vol. ASSP-36, pp. 477–489, Apr. 1988.
J.M. Mendel, Lessons in Digital Estimation Theory. Englewood Cliffs, NJ: Prentice-Hall, 1987.
J.M. Ortega and W.C. Rheinboldt, Iterative Solution of Nonlinear Equations in Several Variables. New York, NY: Academic Press, 1970.
A. Radović and B. Aazhang, “Iterative algorithms for joint data detection and delay estimation for code division multiple access communication systems”, in Proc. of the 31st Annual Allerton Conference on Communication, Control, and Computing, (Allerton House, Monticello, IL), pp. 1–10, Sept. 29-Oct. 1 1993.
D. Dahlhaus, A. Radović and B. H. Fleury, “Joint parameter estimation and data detection for DS/SSMA systems operating in time-dispersive channels”, in Proc. of the 2nd ITG Fachtagung Mobile Kommunikation’ 95, (Neu Ulm, Germany), pp. 323–330, Sept. 1995.
M.B. Pursley and H.F.A. Roefs, “Numerical evaluation of correlation parameters for optimal phases of binary shift-register sequences”, IEEE Trans. Commun., Vol. COM-27, pp. 1597–1604, Oct. 1979.
J.E. Padgett, C.G. Günther and T. Hattori, “Overview of wireless personal communications”, IEEE Commun. Magazine, Vol. 33, pp. 28–41, Jan. 1995.
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Dahlhaus, D., Fleury, B.H. & Radović, A. A Sequential Algorithm for Joint Parameter Estimation and Multiuser Detection in DS/CDMA Systems with Multipath Propagation. Wireless Personal Communications 6, 161–178 (1998). https://doi.org/10.1023/A:1008848721645
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DOI: https://doi.org/10.1023/A:1008848721645