NDLI: Selective decision directed channel estimation for UWA OFDM systems

Content Provider	IEEE Xplore Digital Library
Author	Radosevic, A. Duman, T.M. Proakis, J.G. Stojanovic, M.
Copyright Year	2011
Description	Author affiliation: Dept. of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115 (Stojanovic, M.) \|\| Dept. of Electrical and Computer Engineering, Univ. of California, San Diego, La Jolla, CA 92093 (Radosevic, A.; Proakis, J.G.) \|\| School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85287-5706 (Duman, T.M.)
Abstract	In this paper we explore the performance of a selective decision directed channel estimation (CE) method for underwater acoustic (UWA) orthogonal frequency division multiplexing (OFDM) based communications. The method is based on hard or soft selection of data sub-carriers that are used in the decision directed mode. Particularly, in the process of hard selection we choose those sub-carriers that have high signal-to-noise ratios (SNR), while in the process of soft selection we weight the data sub-carriers for reliable channel estimation. The latter approach is shown to be advantageous since the channel state information (CSI) from all data sub-carriers is exploited. We couple selective decision directed CE with different channel reconstruction methods such as least-squares (LS) with thresholding, orthogonal matching pursuit (OMP), and basis pursuit denoising (BPD). Our results indicate good performance improvements as compared to the block-by-block pilot-assisted CE with a uniform pilot grid for high spectral efficiency communications. Moreover, we explore the trade-offs resulting from using a varying number of pilots and/or decision directed data sub-carriers in terms of the overall system throughput and bit error rate (BER). Experimental results are obtained using real data measurements from the Mobile Acoustic Communication Experiment 2010 (MACE'10), conducted off the coast of Martha's Vineyard.
Starting Page	647
Ending Page	653
File Size	731211
Page Count	7
File Format	PDF
ISBN	9781457718175
e-ISBN	9781457718182
DOI	10.1109/Allerton.2011.6120229
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Channel estimation Receivers Doppler effect Reliability Signal to noise ratio
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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