Title :
Time-varying versus time-invariant finite-length MMSE-DFE on stationary dispersive channels
Author :
Al-Dhahir, Naofal
Author_Institution :
Corp. Res. & Dev., Gen. Electr. Co., Schenectady, NY, USA
fDate :
1/1/1998 12:00:00 AM
Abstract :
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
Keywords :
FIR filters; Gaussian noise; decision feedback equalisers; filtering theory; intersymbol interference; least mean squares methods; time-varying channels; FIR filter; ISI; ISI channels; additive Gaussian noise; block-processing; decision feedback equalizer; filter length; innovations error sequence; intersymbol interference; minimum-mean-square-error DFE; near-optimal performance; performance; stationary dispersive channels; throughput loss; time-invariant finite-length MMSE-DFE; time-varying finite-length MMSE-DFE; Additive noise; Decision feedback equalizers; Dispersion; Finite impulse response filter; Gaussian noise; Helium; Intersymbol interference; Technological innovation; Throughput; Time factors;
Journal_Title :
Communications, IEEE Transactions on
