Differential and coherent decorrelating multiuser receivers for space-time-coded CDMA systems

Authors:
Hongbin Li;Jian Li
Affiliations:
Dept. of Electr. & Comput. Eng., Stevens Inst. of Technol., Hoboken, NJ;-
Venue:
IEEE Transactions on Signal Processing
Year:
2002

Citing 0
Cited 2

Blind channel estimation for space-time coded WCDMA

EURASIP Journal on Wireless Communications and Networking - Special issue on multiuser MIMO networks
Performance Analysis of Space-Time Coded CDMA System Over Nakagami Fading Channels with Perfect and Imperfect CSI

Wireless Personal Communications: An International Journal

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Abstract

Previously, we proposed a differential space-code modulation (DSCM) scheme that integrates the strength of differential space-time coding and spreading to achieve interference suppression and resistance to time-varying channel fading in single-user environments. In this paper, we consider the problem of multiuser receiver design for code-division multiple-access (CDMA) systems that utilize DSCM for transmission. In particular, we propose two differential receivers for such systems. These differential receivers do not require the channel state information (CSI) for detection and, still, are resistant to multiuser interference (MUI) and time-varying channel fading. We also propose a coherent receiver that requires only the CSI of the desired user for detection. The coherent receiver yields improved performance over the differential receivers when reliable channel estimates are available (e.g., in slowly fading channels). The proposed differential/coherent receivers are decorrelative schemes that decouple the detection of different users. Both long and short spreading codes can be employed in these schemes. Numerical examples are presented to demonstrate the effectiveness of the proposed receivers.