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Time-varying versus time-invariant finite-length MMSE-DFE on stationary dispersive channels

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1 Author(s)
Al-Dhahir, N. ; Corp. Res. & Dev., Gen. Electr. Co., Schenectady, NY, USA

A time-varying structure and a time-invariant structure for the finite-length minimum-mean-square-error decision feedback equalizer (MMSE-DFE) are presented and their performances are compared on a stationary channel impaired by intersymbol interference (ISI) and additive Gaussian noise. The time-varying structure has an innovations error sequence but incurs a throughput loss on ISI channels because of its block-processing nature. Conditions under which the time-invariant structure exhibits near-optimal performance are described. Both structures converge to the canonical MMSE-DFE of Cioffi et al. (see ibid., vol.43, p.2582-94, 1995 and vol.43, p.2595-2604, 1995) as their filters' lengths become infinite

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Communications, IEEE Transactions on  (Volume:46 ,  Issue: 1 )