Impact of estimation errors on multiuser detection in CDMA

A majority of multiuser detectors for CDMA are based on coherent detection where carrier frequency, carrier phase, transmission delays and channel characteristics are assumed known at the receiver. In a real system, these parameters must however be estimated based on the received signal. In this paper we investigate the impact of delay and channel estimation errors on the performance of multi-stage successive interference cancellation and limited tree-search detection. The estimation errors are modelled as zero-mean Gaussian random variables with the variance being a measure of the accuracy of the estimation.

[1]  T. J. Lim,et al.  One-shot filtering equivalence for linear successive interference cancellation in CDMA , 1997, 1997 IEEE 47th Vehicular Technology Conference. Technology in Motion.

[2]  Fu-Chun Zheng,et al.  On the performance of near-far resistant CDMA detectors in the presence of synchronization errors , 1995, IEEE Trans. Commun..

[3]  Sumei Sun,et al.  Performance comparison of multi-stage SIC and limited tree-search detection in CDMA , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[4]  Jack M. Holtzman,et al.  Analysis of a simple successive interference cancellation scheme in a DS/CDMA system , 1994, IEEE J. Sel. Areas Commun..

[5]  Lars K. Rasmussen,et al.  Limited Complexity Maximum-Likelihood Detection for CDMA , 1998 .

[6]  A. Svensson,et al.  Multi-stage interference cancellation in multi-rate DS/CDMA systems , 1995, Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications.

[7]  Lars K. Rasmussen,et al.  Mapping functions for successive interference cancellation in CDMA , 1998, VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151).

[8]  Lars K. Rasmussen,et al.  A near ideal noise whitening filter for an asynchronous time-varying CDMA system , 1996, IEEE Trans. Commun..

[9]  Steven D. Gray,et al.  Multiuser detection in mismatched multiple-access channels , 1995, IEEE Trans. Commun..

[10]  Stefan Parkvall,et al.  The Impact of Timing Errors on the Performance of Linear DS-CDMA Receivers , 1996, IEEE J. Sel. Areas Commun..

[11]  T. Aulin.  Optimal Trellis Decoding at Given Complexity , 1993, Proceedings. IEEE International Symposium on Information Theory.

[12]  S. Moshavi,et al.  Multi-user detection for DS-CDMA communications , 1996, IEEE Commun. Mag..

[13]  Craig K. Rushforth,et al.  Joint signal detection and parameter estimation in multiuser communications , 1993, IEEE Trans. Commun..

[14]  Lars K. Rasmussen,et al.  Near optimum tree-search detection schemes for bit-synchronous multiuser CDMA systems over Gaussian and two-path Rayleigh-fading channels , 1997, IEEE Trans. Commun..

[15]  John B. Anderson,et al.  Reduced-state sequence detection with convolutional codes , 1994, IEEE Trans. Inf. Theory.

[16]  Roger L. Peterson,et al.  Introduction to Spread Spectrum Communications , 1995 .

[17]  Peter Jung,et al.  Joint detection with coherent receiver antenna diversity in CDMA mobile radio systems , 1995 .

[18]  Lars K. Rasmussen,et al.  Breadth-first maximum likelihood detection in multiuser CDMA , 1997, IEEE Trans. Commun..