Performance Analysis of Blind Channel Estimation for Precoded Multiuser Systems

  • Xu, Zhengyuan (Department of Electrical Engineering, University of California)
  • 발행 : 2002.09.01

초록

Precoder has been shown to be able to provide source diversity and design flexibility. In this paper we employ precoding techniques for block transmission based on a multirate filterbank structure. To accommodate multiuser communication with variable data rates, different precoders with corresponding coefficients and up/down sampling rates are used. However, due to unknown multipath distortion, different interferences may exist in the received data, such as multiuser interference, intersymbol interference and interblock interference. To estimate channel parameters for a desired user, we employ all structured signature waveforms associated with different symbols of that user and apply subspace techniques. Therefore better performance of channel estimator can be achieved than the conventional subspace method based only on the signature of the current symbol. The delay for that user can also be jointly estimated. Channel identifiability conditions and asymptotic channel estimation error are investigated in detail. Numerical examples are provided to justify the proposed method. gest either multicode (MC) or multiple processing gain (MPG) mechanism [2], while requiring data rates to be integral multiples of some basic low-rate. In order to support variable rate transmission however, a comprehensive scheme needs to be investigated.

키워드

참고문헌

  1. T. Rappaport, Wireless Communications, Prentice Hall, Upper Saddle River, NJ,1996
  2. M. Juntti, 'System concept comparisons for multirate CDMA with multiuser detection,' Proc. VTC'98, vol.l, Ottawa, Canada, May 1998, pp.36-40
  3. P. Vaidyanathan, Muttirate Systems and Fitter Banks, Prentice Hall, Englewood Cliffs, NJ, 1993
  4. A. Scaglione, S. Barbarossa, and G. Giannakis, 'Filterbank transceivers optimizing information rate in block transmissions over dispersive channels,' IEEE Trans. Inform. Theory, vol. 45, no. 3, pp. 1019-1032, Apr. 1999 https://doi.org/10.1109/18.761338
  5. A. Scaglione, G. Giannakis, and S. Barbarossa, 'Redundant filterbank precoders and equalizers, Part II: Blind channel estimation, synchronization,and direct equalization,' IEEE Trans. Signal Processing, vol. 47, no. 7, pp.2007-2022, July 1999 https://doi.org/10.1109/78.771048
  6. J. Proakis, Digital Communications, 3rd ed., McGraw-Hill, New York, 1995
  7. A. Scaglione, G. Giannakis, and S. Barbarossa, 'Redundant filterbank precoders and equalizers, Part I: Unification and optimal designs,' IEEE Trans. Signal Processing, vol. 47, no. 7, pp. 1988-2006, July 1999 https://doi.org/10.1109/78.771047
  8. X. Xia, 'New preceding for intersymbol interference cancellation using nonmaximally decimated multirate filterbanks with ideal FIR equalizers,' IEEE Trans. Signal Processing, vol. 45, no. 10, pp. 2431-2441, Oct. 1997 https://doi.org/10.1109/78.640709
  9. J. Yang and S. Roy, 'On joint transmitter and receiver optimization for multiple-input-multiple-output (MIMO) transmission systems,' IEEE Trans. Commun., vol. 42, no. 12, pp.3221-3231, Dec. 1994 https://doi.org/10.1109/26.339844
  10. Z. Xu, 'Blind channel estimation for precoded variable bit-rate multiuser systems,' Proc. 34th Asilomar Conf. on Signals, Systems, and Computers (Asilomar'00), vol. 2, Pacific Grove, CA, Oct. 29-Nov. 1, 2000, pp. 1273-1277
  11. A. J. Van Der Veen, 'Blind subspace-based uplink receiver algorithm for wideband CDMA,' Proc. IEEE VTC'99, vol. 1, Amsterdam, Netherlands, Sept. 19-22, 1999, pp.176-180
  12. P. Loubaton and E. Moulines, 'On blind multiuser forwardlink channel estimation by the subspace method: Identifiability results,' IEEE Trans. Signal Processing, vol. 48, no. 8, pp. 2366-2376, Aug. 2000 https://doi.org/10.1109/78.852017
  13. G. Giannakis et al., 'AMOUR-generalized multicarrier transceivers for blind CDMA regardless of multipath,' IEEE Trans. Commun., vol. 48, no.12, pp.2064-2076, Dec.2000 https://doi.org/10.1109/26.891217
  14. Z. Liu and G. Giannakis, 'Space-time block-coded multiple access through frequency-selective fading channels,' IEEE Trans. Commun., vol.49, no. 6, pp. 1033-1044, June 2001 https://doi.org/10.1109/26.930633
  15. E. Moulines et al., 'Subspace methods for the blind edentification of multichannel FIR filters,' IEEE Trans. Signal Processing, vol. 43, no. 2, pp.516-525, Feb.1995 https://doi.org/10.1109/78.348133
  16. S. Bensley and B. Aazhang, 'Subspace-based channel estimation for code division multiple access communication Systems,' IEEE Trans. Commun., pp. 1009-1020, Aug. 1996
  17. M. Torlak and G. Xu, 'Blind multiuser channel estimation in asynchronous CDMA systems,' IEEE Trans. Signal Processing, vol. 45, no. 1, pp. 137-147,Jan. 1997 https://doi.org/10.1109/78.552212
  18. X. Wang and H. Poor, 'Blind multiuser detection: A subspace approach,' IEEE Trans. Inform. Theory. vol. 44, no. 2, pp. 677-690, Mar. 1998 https://doi.org/10.1109/18.661512
  19. X. Wang and H. Poor, 'Blind equalization and multiuser detection in dispersive CDMA channels,' IEEE Trans. Commun., vol. 46, no. 1, pp. 91-103, Jan. 1998 https://doi.org/10.1109/26.655407
  20. M. Tsatsanis and Z. Xu, 'Performance analysis of minimum variance CDMA receivers,' IEEE Trans. Signal Processing, vol. 46, no. 11, pp.3014-3022, Nov. 1998 https://doi.org/10.1109/78.726814
  21. Y. Hua and T. Sarkar, 'Perturbation analysis of the TK method for harmonic retrieval problem,' IEEE Trans. Acoustics, Speech, and Signal Processing, vol. 36, no. 2, pp. 228-240, Feb. 1988 https://doi.org/10.1109/29.1515
  22. F. Li, H. Liu, and R. Vaccaro, 'Performance analysis for DOA estimation algorithms: Unification, simplification, and observations,' IEEE Trans. Aerospace and Etectron. Systems, vol. 29, no. 4, pp. 1170-1184, Oct. 1993 https://doi.org/10.1109/7.259520
  23. M. Viberg and B. Ottersten, 'Sensor array processing based on subspace fitting,' IEEE Trans. Signal Processing, vol. 39, no. 5, pp. 1110-1121, May 1991 https://doi.org/10.1109/78.80966
  24. W. Qiu and Y. Hua, 'Performance analysis of the matrix pair method for blind channel identification,' IEEE Trans. Inform, theory, vol. 43, no. 4, pp.1245-53, July 1997 https://doi.org/10.1109/18.605588
  25. E. Aktas and U. Mitra, 'Complexity reduction in subspace-based blind channel identification for DS/CDMA systems,' IEEE Trans. Commun., vol.48, no. 8, pp. 1392-1404, Aug. 2000 https://doi.org/10.1109/26.864176
  26. B. Friedlander and A. Weiss, 'On the second-order statistics of the eigen vectors of sample covariance matrices,' IEEE Trans. Signal Processing, vol.46, no.11, pp. 3136-3139, Nov. 1998 https://doi.org/10.1109/78.726832
  27. G. Golub and C. Van Loan, Matrix Computations, 2nd edition, The Johns Hopkins University Press, Baltimore, MD, 1989
  28. Z. Xu, 'Asymptotically near-optimal blind estimation of multipath CDMA channels,' IEEE Trans. Signal Processing, vol. 49, no. 9, pp. 2003-2017, Sept. 2001 https://doi.org/10.1109/78.942629
  29. Z. Wang and G. Giannakis, 'Wireless multicarrier communications,' IEEE Signal Processing Mag., vol. 17, no. 3, pp. 29-48, May 2000 https://doi.org/10.1109/79.841722
  30. M. Juntti, 'Performance of multiuser detection in multirate CDMA systems,' Wireless Personal Communications, vol. 11, no.3, pp.293-311, Dec. 1999 https://doi.org/10.1023/A:1018628807970
  31. U. Mitra, 'Comparison of maximum-likelihood-based detection for two multirate access schemes for CDMA signals,' IEEE Trans. Commun., vo1.47, no.l, pp.64-77, Jan. 1999 https://doi.org/10.1109/26.747814
  32. G. Stewart and J. Sun, Matrix Perturbation Theory, Academic Press, San Diego, CA, 1990
  33. P. Lancaster and M. Tismenetsky, The Theory of Matrices, 2nd edition, Academic Press, San Diego, CA, 1985