Multiuser Detection
Digital Beamforming in Wireless Communications
Digital Beamforming in Wireless Communications
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Blind separation of synchronous co-channel digital signals using anantenna array. I. Algorithms
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
IEEE Transactions on Wireless Communications
IEEE Communications Magazine
Overloaded array processing with spatially reduced search joint detection
IEEE Journal on Selected Areas in Communications
An iterative list-based multiuser detector for overloaded receivers in a rayleigh fading channel
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
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A wireless communication system is overloaded when the number of transmitted signals exceeds the number of receive antennas. The presence of the resulting cochannel interference (CCI) under overload causes linear detection techniques to perform poorly. We develop a unified approach to the separation and detection of the user signals for an overloaded system using a novel iterative list-based multiuser detector. It combines a linear preprocessor with a nonlinear list detector and approximates optimum joint maximum-likelihood detection at lower complexity. Complexity savings are achieved by first, exploiting the spatial separation of the users to mitigate CCI in the preprocessor stage and second, by estimating residual CCI in the following list detection stage. The proposed list detection algorithm is applied to receivers with either a uniform circular array or a uniform linear array. The preprocessor is implemented using either a special purpose spatial filter to mitigate the CCI or maximumratio diversity combining to achieve diversity gain. Simulation results and a complexity analysis indicate that the approach is suitable for practical application.