Matrix analysis
Optimization by Vector Space Methods
Optimization by Vector Space Methods
Detection, Estimation, and Modulation Theory: Radar-Sonar Signal Processing and Gaussian Signals in Noise
Robust constrained linear receivers for CDMA wireless systems
IEEE Transactions on Signal Processing
Lagrange/Vandermonde MUI eliminating user codes forquasi-synchronous CDMA in unknown multipath
IEEE Transactions on Signal Processing
Performance analysis of the minimum variance beamformer
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Sufficient conditions for the local convergence of constant modulusalgorithms
IEEE Transactions on Signal Processing
IEEE Transactions on Wireless Communications
Performance of blind and group-blind multiuser detectors
IEEE Transactions on Information Theory
IEEE Communications Magazine
Group-blind multiuser detection for uplink CDMA
IEEE Journal on Selected Areas in Communications
Partial sampling MMSE interference suppression in asynchronous multicarrier CDMA system
IEEE Journal on Selected Areas in Communications
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We consider the problem of blind (i.e., without training sequences) linear mitigation of multiple-access interference in the uplink of quasi-synchronous multicarrier code-division multiple-access (MC-CDMA) systems. In the first part of the paper, we present the analytical performance assessment of the recently proposed blind two-stage multiuser detector, whose synthesis requires only the knowledge of the spreading code of the desired user. The analysis allows one to evaluate the actual performance when the receiver's parameters are estimated by resorting to a finite data record. Based on this analysis, in the second part of the paper, we propose to improve the performance of the two-stage detector by adding a quadratic constraint in the first stage synthesis, which exploits the knowledge of the spreading codes of the active users within the cell of interest. It is shown analytically that incorporation of such a quadratic constraint improves the receiver robustness against errors in the estimated statistics of the received data, although it slightly reduces the interference suppression capabilities of the two-stage detector. The effectiveness of the proposed receiver is further corroborated by computer simulation results.