Allpass forward equalizer for decision feedback equalization

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...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1995-11, Vol.31 (6), p.3045-3047
Main Authors: McEwen, P.A., Kenney, J.G.
Format: Article
Language:English
Subjects:
Applied sciences
Decision feedback equalizers
Electronics
Energy consumption
Exact sciences and technology
Finite impulse response filter
Hardware
Interference cancellation
Intersymbol interference
Magnetic devices
Magnetic recording
Other magnetic recording and storage devices (including tapes, disks, and drums)
Poles and zeros
Quantum computing
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
White noise
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Summary: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.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.490264