Underwater acoustic communication systems suffer from the channel impairments which results in time spreading of the transmitted signal. In underwater environment, multiple replicas of the transmitted signal are received at the receiver through different paths, which causes significant Inter-Symbol Interference (ISI). Decision Feedback Equalizers (DFE) was utilized to overcome this type of inte...

Signals when pass through a channel undergo various forms of distortion, most common of which is Inter-symbol-interference, so called ISI. Inter-symbol interference induced errors can cause the receiver to misinterpret the received samples. Equalizers are important parts of receivers, which minimizes the linear distortion produced by the channel. If channel characteristics are known a priori, t...

Conventional versions of linear multiuser detectors (MUD) are not feasible in the wideband code division multiple access (WCDMA) downlink due to the use of long scrambling sequences. As an alternative, linear channel equalizers restore the orthogonality of the spreading sequences lost in frequency-selective channels, thus, suppressing multiple access interference (MAI) in the WCDMA downlink. In...

Linear adaptive equalizers are widely used in wireless communication systems in order to reduce the effects of the channel distortion. Various researchers have used linear block equalizers for different modulations techniques. In this paper the BER performance of different M-PSK and M-QAM modulations with the block based LMS and RLS linear equalizers are compared over the flat and frequency sel...

This paper introduces adaptive fuzzy equalizers with variable step size for broadband power line (PL) communications. Based on delta-bar-delta and local Lipschitz estimation updating rules, feedforward, and decision feedback approaches, we propose singleton and nonsingleton fuzzy equalizers with variable step size to cope with the intersymbol interference (ISI) effects of PL channels and the ha...

Due to non-linear channel behaviour, the bit error rate at the receiver side increases and receiver is not able to recognize the signal levels. Equalizer play an important role is such situations and is designed to have an impulse response which is reciprocal to the response of the channel, hence resulting in an overall linear response. As channel response is not static in nature, so equalizer ...

Recently, novel equalizer structures combining traditional transversal equalizers and neural networks have been introduced for adaptive discrete-signal detection. It has been shown that the equalizer performance can be improved using neural networks, especially in compensating nonlinear distortions. In addition to noise and nonlinear distortions various interfering signals may be present. In th...

This paper presents performance analysis of an adaptive Volterra/Hybrid equalizer in a nonlinear magneto-optic data storage channel. In a data storage system, nonlinear intersymbol interference (ISI) is one of the limiting factors for high storage density. Volterra and Hybrid (combination of linear and Volterra) equalizers are proposed and developed for compensation of nonlinear ISI. The use of...

This paper presents some results and conjectures dealing with channel equalization. For several possible equalizers, the following question is considered: if the equalizer output sequence has identical statistics to the input signal sequence, has the equalizer correctly converged? 1. THE PROBLEM DOMAIN Many communication signal processing problems envisage a transmitted sequence a0 a1, ... draw...