Reduced bandwidth frequency domain equalization for underwater acoustic communications

James C. Preisig, Andrew C. Singer, Gregory W. Wornell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Two challenges facing adaptive decision feedback equalizers (DFEs) in the underwater acoustic channel are those of the channel changing too rapidly to allow for the stable adaptation of the number of coefficients required to represent the equalizer filters and the high computational complexity of the associated adaptation algorithms. These challenges are particularly acute for multichannel DFEs where a separate filter needs to be adapted for each input signal channel. A multichannel "frequency domain" DFE is proposed in which the feedforward filter coefficients are represented in the frequency domain while the feedback filter coefficients are represented in the time domain. For fractionally sampled input signals, the frequency range over which the feedforward filter coefficients are calculated is limited thus reducing the number of coefficients that need to be calculated. The resulting DFE is shown to have both improved demodulation performance and a reduced complexity when compared to a time domain equalizer.

Original languageEnglish (US)
Title of host publication2010 IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2010
Pages93-96
Number of pages4
DOIs
StatePublished - 2010
Event2010 IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2010 - Jerusalem, Israel
Duration: Oct 4 2010Oct 7 2010

Publication series

Name2010 IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2010

Other

Other2010 IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2010
CountryIsrael
CityJerusalem
Period10/4/1010/7/10

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering

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