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Allpass forward equalizer for decision feedback equalization

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2 Author(s)
McEwen, Peter A. ; Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA ; Kenney, J.G.

An allpass forward equalizer (APFE) for use with decision feedback equalization (DFE) is described, The APFE has poles, unlike the normally implemented FIR (finite impulse response) forward equalizer; equalizers with poles can provide superior performance or reduced hardware complexity when compared to all-zero equalizers, but can have local optima and are more difficult to design. A theoretical basis for the allpass is presented and a systematic design procedure is described. It is shown that there are no local optima in a sufficient region about the global optimum such that adaptation is feasible. A performance vs. complexity advantage is shown for the APFE relative to the FIR forward equalizer, and implementation as a continuous-time filter is proposed

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Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )