A constant-modulus algorithm for blind multiuser detection in DS-CDMA systems with antenna array

Abstract

Blind multiuser detectors based on the constant modulus (CM) criterion have shown significant resistance to the spreading code estimation error in its demodulation. In this paper, we consider a CM-based blind adaptive multiuser detector which utilizes the spatial diversity provided by an antenna array to improve the demodulation performance. Our analysis and simulation results show that the introduction of an antenna array leads to a substantial improvement in the demodulation performance and, compared with the constrained minimum output energy (CMOE) space-time blind adaptive multiuser detector, the proposed detector shows robustness to the signature code inaccuracy.