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In this paper we propose a minimum mean-square error (MMSE) decision feedback (DF) time-varying (TV) finite impulse response (FIR) equalizer for doubly-selective (time-and frequency-selective) channels. We use the basis expansion model (BEM) to approximate the doubly-selective channel and to design the TV FIR DFE. This allows us to turn a large design problem into an equivalent small design problem, containing only the BEM coefficients of the doubly-selective channel and the BEM coefficients ofdoi:10.1109/glocom.2003.1258638 dblp:conf/globecom/BarhumiLM03 fatcat:2b422zu5b5c4jppis3uznq7qqm