Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/5234
Título: OFDM demodulation in underwater time-reversed shortned channels
Autor: Gomes, João
Silva, A.
Jesus, S. M.
Palavras-chave: Bandwidth
Channel estimation
Cost function
Demodulation
Dispersion
Narrowband
OFDM modulation
Quadrature phase shift keying
Sensor arrays
Underwater communication
Data: 2008
Editora: IEEE Explore
Citação: J.P. GOMES, A. SILVA and S.M. JESUS, ''OFDM Demodulation in Underwater Time-Reversed Shortned Channels'' in OCEANS'08, Quebec, Canada, pp. 1-8, September.
Resumo: 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 l1 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.
Peer review: yes
URI: http://hdl.handle.net/10400.1/5234
DOI: http://dx.doi.org/ 10.1109/OCEANS.2008.5152034
ISBN: 978-1-4244-2619-5
978-1-4244-2620-1
Versão do Editor: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5152034&tag=1
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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