Matched Filters with Interference Suppression Capabilities for DS-CDMA

This paper considers the design of near-far resistant matched filters (MFs) for direct-sequence code-division multiaccess (DS-CDMA) systems. We show how additional information on the individual powers and chip delays of locked users, that is available at the base station, can be exploited for the design of these MFs. The proposed receiver can specifically reduce the effects of the locked interferers at the expense of a partial increase in complexity over the conventional MF. Furthermore, this detection technique is a link between the linear minimum mean squared error (MMSE) centralized multiuser detector and the decentralized noise-whitening MF. Numerical results for the rectangular chip pulse illustrate the signal-to-noise ratio (SNR), near-far resistance, and bit-error rate (BER) improvement that the proposed MF yields over the conventional MF and noise-whitening MF.

[1]  L. B. Milstein,et al.  Theory of Spread-Spectrum Communications - A Tutorial , 1982, IEEE Transactions on Communications.

[2]  Asrar U. H. Sheikh,et al.  Decision feedback equalization for CDMA in indoor wireless communications , 1994, IEEE J. Sel. Areas Commun..

[3]  Craig K. Rushforth,et al.  A Family of Suboptimum Detectors for Coherent Multiuser Communications , 1990, IEEE J. Sel. Areas Commun..

[4]  H. Vincent Poor,et al.  Single-user detectors for multiuser channels , 1988, IEEE Trans. Commun..

[5]  M.B. Pursley,et al.  Crosscorrelation properties of pseudorandom and related sequences , 1980, Proceedings of the IEEE.

[6]  Mahesh K. Varanasi.  Group sequence detection for the asynchronous Gaussian code-division multiple-access channel , 1994, 1994 IEEE GLOBECOM. Communications: Communications Theory Mini-Conference Record,.

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

[8]  Scott L. Miller.  An adaptive direct-sequence code-division multiple-access receiver for multiuser interference rejection , 1995, IEEE Trans. Commun..

[9]  Sergio Verdú,et al.  Near-far resistance of multiuser detectors in asynchronous channels , 1990, IEEE Trans. Commun..

[10]  Sergio Verdú,et al.  Minimum probability of error for asynchronous Gaussian multiple-access channels , 1986, IEEE Trans. Inf. Theory.

[11]  Sergio Verdu,et al.  Recent progress in Multiuser Detection , 1989 .

[12]  Branka Vucetic,et al.  Adaptive receiver structures for asynchronous CDMA systems , 1994, IEEE J. Sel. Areas Commun..

[13]  Harry Leib,et al.  Matched filtering in improper complex noise and applications to DS-CDMA , 1995, Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications.

[14]  J. M. Holtzman,et al.  DS/CDMA successive interference cancellation , 1994, Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94).

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

[16]  Zoran Zvonar,et al.  Multiuser detection for CDMA systems , 1995, IEEE Wirel. Commun..

[17]  E. A. Geraniotis,et al.  Error Probability for Direct-Sequence Spread-Spectrum Multiple-Access Communications - Part II: Approximations , 1982, IEEE Transactions on Communications.

[18]  Laurence B. Milstein,et al.  A noise-whitening approach to multiple access noise rejection .I. Theory and background , 1994, IEEE J. Sel. Areas Commun..

[19]  Behnaam Aazhang,et al.  Multistage detection in asynchronous code-division multiple-access communications , 1990, IEEE Trans. Commun..