Reduced bandwidth frequency domain equalization for underwater acoustic communications
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Wornell_Reduced bandwidth.pdf
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831.51 KB
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Author(s)
Wornell, Gregory W.
Preisig, James C.
Singer, Andrew C.
Date Issued
October 2010
Journal
Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM), 2010
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Wornell, Gregory W. et al. "Reduced bandwidth frequency domain equalization for underwater acoustic communications." Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop (SAM), 2010: 93-96. © 2010 IEEE.
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1109/SAM.2010.5606501
