Design of fractionally spaced equalizers

(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)
Subjects: Electrical
Department: College of Engineering and Physics > Electrical Engineering
Committee Advisor: Hassan, Essam E.
Committee Members: Bettayeb, Mammar and El-Hennawey, M. S.
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 14:05
Last Modified: 01 Nov 2019 14:01