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Basis expansion models and diversity techniques for blind identification and equalization of time-varying channels

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2 Author(s)
Giannakis, G.B. ; Dept. of Electr. Eng., Virginia Univ., Charlottesville, VA, USA ; Tepedelenlioglu, C.

The time-varying impulse response of rapidly fading mobile communication channels is expanded over a basis of complex exponentials that arise due to Doppler effects encountered with multipath propagation. Blind methods are reviewed for estimating the bases' parameters and the model orders. Existing second-order methods are critiqued and novel algorithms are developed for blind identification, direct, zero-forcing equalization and minimum mean square error (MMSE) equalization by combining channel diversity with temporal (fractional sampling) and/or spatial diversity which becomes available with multiple receivers. Illustrative simulations are also presented

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Proceedings of the IEEE  (Volume:86 ,  Issue: 10 )