A novel iterative multiuser detector for complex modulation schemes

A novel multiuser detector for direct sequence code division multiple access is proposed. The receiver performs iterated soft decision interference cancellation (ISDIC) based on multiuser interference suppression filters designed for minimization of the mean-square error. Assuming a complex modulation format, we show that the multiuser interference becomes rotationally variant in the course of the iterations. Regarding this rotational variance in the design of the multiuser interference suppression filter, the presented iterative multiuser detector achieves significant performance gains compared with conventional ISDIC employing a standard minimum mean-squared error filter which is optimum only for rotationally invariant multiuser interference.

[1]  Dariush Divsalar,et al.  Improved parallel interference cancellation for CDMA , 1998, IEEE Trans. Commun..

[2]  Upamanyu Madhow,et al.  MMSE interference suppression for direct-sequence spread-spectrum CDMA , 1994, IEEE Trans. Commun..

[3]  A. Lampe.  An analytic solution to the performance of iterated soft decision interference cancellation for coded CDMA transmission over frequency selective fading channels , 2000, 2000 IEEE Sixth International Symposium on Spread Spectrum Techniques and Applications. ISSTA 2000. Proceedings (Cat. No.00TH8536).

[4]  Giacinto Gelli,et al.  Blind widely linear multiuser detection , 2000, IEEE Communications Letters.

[5]  H. Vincent Poor,et al.  Blind equalization and multiuser detection in dispersive CDMA channels , 1998, IEEE Trans. Commun..

[6]  Marco Lops,et al.  A new class of multiuser CDMA receivers based on the minimum mean-output-energy strategy , 2000, 2000 IEEE International Symposium on Information Theory (Cat. No.00CH37060).

[7]  Pascal Chevalier,et al.  Widely linear estimation with complex data , 1995, IEEE Trans. Signal Process..

[8]  Robert Schober,et al.  Receivers with widely linear processing for frequency-selective channels , 2003, IEEE Trans. Commun..

[9]  S. Verdú,et al.  Spectral efficiency of low-complexity multiuser detectors , 2000, 2000 IEEE International Symposium on Information Theory (Cat. No.00CH37060).

[10]  S. Haykin,et al.  Adaptive Filter Theory , 1986 .

[11]  David Tse,et al.  Linear multiuser receivers for multipath fading channels , 1999, Proceedings of the 1999 IEEE Information Theory and Communications Workshop (Cat. No. 99EX253).

[12]  Joseph R. Cavallaro,et al.  Iterative Multiuser Detection and Decoding , 1998 .

[13]  F. Tarkoy.  MMSE-optimal feedback and its applications , 1995, Proceedings of 1995 IEEE International Symposium on Information Theory.

[14]  David Tse,et al.  Linear Multiuser Receivers: Effective Interference, Effective Bandwidth and User Capacity , 1999, IEEE Trans. Inf. Theory.

[15]  T. Le-Ngoc,et al.  Impact of imperfect power control and channel estimation on the performance of multiuser detectors , 1999, Seamless Interconnection for Universal Services. Global Telecommunications Conference. GLOBECOM'99. (Cat. No.99CH37042).

[16]  David Tse,et al.  Effective interference and effective bandwidth of linear multiuser receivers in asynchronous CDMA systems , 2000, IEEE Trans. Inf. Theory.

[17]  R.R. Muller,et al.  Gaussian multiple-access channels with weighted energy constraint , 1998, 1998 Information Theory Workshop (Cat. No.98EX131).

[18]  Sofiène Tahar,et al.  Adaptive multistage parallel interference cancellation for CDMA , 1999, IEEE J. Sel. Areas Commun..

[19]  Bernard Fino,et al.  Multiuser detection: , 1999, Ann. des Télécommunications.

[20]  James L. Massey,et al.  Proper complex random processes with applications to information theory , 1993, IEEE Trans. Inf. Theory.

[21]  V. Marčenko,et al.  DISTRIBUTION OF EIGENVALUES FOR SOME SETS OF RANDOM MATRICES , 1967 .

[22]  Harry Leib,et al.  Maximizing SNR in improper complex noise and applications to CDMA , 1997, IEEE Communications Letters.

[23]  Johannes B. Huber,et al.  On improved multiuser detection with iterated soft decision interference cancellation , 1999, 1999 IEEE Communications Theory Mini-Conference (Cat. No.99EX352).

[24]  H. Vincent Poor,et al.  Iterative (turbo) soft interference cancellation and decoding for coded CDMA , 1999, IEEE Trans. Commun..

[25]  Sumei Sun,et al.  A matrix-algebraic approach to linear parallel interference cancellation in CDMA , 2000, IEEE Trans. Commun..