NDLI: OFDM demodulation in underwater time-reversed shortened channels

Content Provider	IEEE Xplore Digital Library
Author	Gomes, J. Silva, A. Jesus, S.
Copyright Year	2008
Description	Author affiliation: Inst. Super. Tecnico, Lisbon, Portugal (Gomes, J.)
Abstract	This work addresses the problem of OFDM transmission in dispersive underwater channels where impulse responses lasting tens of miliseconds cannot be reliably handled by recently proposed methods due to limitations of channel estimation algorithms. The proposed approach relies on passive time reversal for multichannel combining of observed waveforms at an array of sensors prior to OFDM processing, which produces an equivalent channel with a shorter impulse response that can be handled much more easily. A method for tracking the narrowband residual phase variations of the channel after Doppler preprocessing is proposed. This is a variation of an existing technique that can improve the spectral efficiency of OFDM by reducing the need for pilot symbols. This work also examines techniques to handle sparse impulse responses and proposes a channel estimation method where an $l_{1}$ norm is added to the standard least-squares cost function to transparently induce sparseness in the vector of channel coefficients. Algorithms are assessed using data collected during the UAB'07 experiment, which was conducted in Trondheim fjord, Norway, in September 2007. Data were transmitted with bandwidths of 1.5 and 4.5 kHz, and recorded at a range of about 800 m in a 16-hydrophone array. Significant multipath was observed over a period of at least 30 ms.
Starting Page	1
Ending Page	8
File Size	872389
Page Count	8
File Format	PDF
ISBN	9781424426195
DOI	10.1109/OCEANS.2008.5152034
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-15
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Demodulation Channel estimation Sensor arrays Cost function Dispersion Narrowband Bandwidth OFDM modulation Quadrature phase shift keying Underwater communication
Content Type	Text
Resource Type	Article

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