Feedback equalization for fading dispersive channels

Fading channels: information-theoretic and communications aspects

“…In such cases, the decisionfeedback equalizer (DFE) provides a computationally efficient albeit suboptimum, alternative [483]. The basic idea in decision-feedback equalization is that once an information symbol has been detected, the ISI that it causes on future symbols may be estimated and subtracted out prior to symbol detection.…”

Introduction of Frequency-Domain Signal Processing to Broadband Single-Carrier Transmissions in a Wireless Channel

“…The idea that the previous decisions are used to cope with the ISI problem was first introduced in [17] and was later extended in [18] to minimize the mean square error (MSE) between the decision variable and the transmitted symbol. The optimum equalizer assuming ideal decision feedback is a matched filter to the channel [18]. The optimum DFE technique was derived in [19] and [20].…”

A channel subspace post-filtering approach to adaptive equalization

“…Adaptive equalizers using a decision feedback type structure (22) have been shown to be successful when used in receivers for UWA communications particularly when estimates of the channel impulse response are used to adapt the taps of the equalizer (31,34). Despite the significant progress made in past decade or so in designing adaptive algorithms for UW A communication systems, there are stil many underwater acoustic channels over which such algorithms are unable to establish reliable communications.…”