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By Khalid Mahmood, Syed Muhammad Asad, Muhammad Moinuddin
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Keywords: DFE, MIMO, Equalization, LMS, Constrained optimization, MMSE.
A decision feedback equalizer (DFE) is a nonlinear equalizer which utilizes the previous detector assessment to mitigate the intersymbol interference (ISI) on received symbols. Alternatively, we can say that the distortion on the current symbol that was caused by previous symbols is eliminated. While linear equalizer (LE) can be employed on the channels where the ISI is not significantly present but in case when there is a severe ISI channel then DFE's have been effectively used to mitigate ISI. Different techniques have been proposed to improve the decision feedback equalization performance. In this paper we have reviewed some of the existing equalization techniques and have highlighted their performance gains.