Abstract
In this paper, we propose the blind space-time high rate multi-user detector for synchronous uplink multi-rate Direct Sequence Code Division Multiple Access (DS-CDMA) systems with antenna array at the base station. By employing antenna array at the base stations, the spatial dimension is used efficiently to suppress co-channel interference and increase the capacity for multi-rate CDMA system. After low rate physical users in the system are modeled as corresponding high rate virtual users, we construct the space-time signature vectors of virtual users. And subspace projection algorithm is employed to estimate space-time signature vectors blindly. Then a soft-decision high rate multiuser detector is proposed based on the estimated signature vectors, which avoids estimating the ambiguous complex factors which are necessary in traditional blind detector. Numerical simulation results evaluate the performance in terms of Bit Error Rate (BER) for the proposed scheme. Simultaneously, it demonstrates that the system capability increases two times when using two-element antenna array.
Similar content being viewed by others
References
J. Juntti Markku. System concept comparisons for multirate CDMA with multiuser detection. Proc. of IEEE Vehicular Technology Conference, Ottowa, Canada, 1998, 36–40.
Zhihua Guo, Ben Letaief Khaled. Performance of multiuser detection in multirate DS-CDMA systems. IEEE Trans. on Communications, 51(2003)12, 1979–1983.
Mingxi Fan, Ceilidh Hoffmann, Kai-Yeung Siu. Error-rate analysis for multirate DS-CDMA transmission schemes. IEEE Trans. on Communications, 51(2003)11, 1897–1909.
M. Saquib, R. Yates, N. Mandayam. Decorrelating detectors for a dual-rate synchronous DS/CDMA channel. Proc. of IEEE Vehicular Technology Conference, Atlanta, GA, May 1996, 377–381.
L. Huang, F. C. Zheng, M. Faulkner. Space-time multirate blind multiuser detection for synchronous DS/CDMA systems. GLOBECOM’01, San Antonio, USA, 2001, 146–150.
Jinghong Ma, Jitendra K. Tugnait. Blind detection of multirate asynchronous CDMA signals in multipath channels. IEEE Trans. on Signal Processing, 50(2002)9, 2258–2272.
David J. Sadler, Athanassios Manikas. Blind reception of multicarrier DS-CDMA using antenna arrays. IEEE Trans. on Wireless Communications, 2(2003)6, 1231–1239.
Henry Stark, Yongyi Yang. Vector Space Projections. New York, Wiley Press, 1998, chapter 2.
Xiaodong Wang, H. Vincent Poor. Blind multiuser detection: a subspace approach. IEEE Trans. on Information Theory, 44(1998)2, 677–690.
Author information
Authors and Affiliations
Corresponding author
Additional information
Partially supported by the National Natural Science Foundation of China (No.60572046 & No.60502022) and the Research Fund for Doctoral Program of Higher Education of China (No.20020698024 & No.20030698027).
About this article
Cite this article
Zhang, Y., Yin, Q., Sun, R. et al. Blind detection for multi-rate DS-CDMA system with antenna array at the base station. J. of Electron.(China) 23, 820–824 (2006). https://doi.org/10.1007/s11767-005-0039-4
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/s11767-005-0039-4