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Design of fractionally spaced equalizers

Zerguine, Azzedine (1990) Design of fractionally spaced equalizers. Masters thesis, King Fahd University of Petroleum and Minerals.

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English Abstract

The main idea of equalization is simply to compensate for nonideal characteristics by additional filtering. An equalizer is, then, an adaptive filter that is capable of high-speed digital signaling over slowly varying, band limited channels whose impulse responses are unknown at the receiver. The fractionally-spaced equalizer is superior to the synchronous equalizer, and this is in its ability to be not affected by aliasing problems and independent of the sampler phase. However, for a given time span NT, a synchronous equalizer will need N tap coefficients, while (2N) tap coefficients are needed for a fractionally-spaced equalizer with tap spacing T/2. This will result in a great amount of computations needed to update the tap coefficients every symbol period, an important drawback of the fractionally-spaced equalizer. In this thesis, we introduce an idea where a compromise between performance and complexity, for both equalizers, is presented. The idea consists of setting some of the tap coefficients of a fractionally-spaced equalizer with tap spacing T/2, to zero. The zerotap coefficients are neither updated nor entered in the computational process, thus leading to simplified algorithms.



Item Type:Thesis (Masters)
Date:January 1990
Date Type:Completion
Subjects:Electrical
Divisions:College Of Engineering Sciences > Electrical Engineering Dept
Creators:Zerguine, Azzedine
Committee Advisor:Hassan, Essam E.
Committee Members:Bettayeb, Mammar and El-Hennawey, M. S.
ID Code:10464
Deposited By:KFUPM ePrints Admin
Deposited On:22 Jun 2008 17:05
Last Modified:30 Apr 2011 15:38

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