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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/37563

Title: Design and implementation of OFDM acoustic modem for underwater communication
Authors: Hsien-Seng Hung
Contributors: C. L. Wei;L. Chiu;C. F. Chen
Keywords: Doppler effect
OFDM modulation
acoustic receivers
adaptive equalisers
channel estimation
error statistics
least mean squares methods
modems
transient response
underwater acoustic communication
Date: 2014
Issue Date: 2016-03-21T07:26:12Z
Publisher: OCEANS 2014 - TAIPEI
Abstract: Abstract:This paper is aimed to develop a low-complexity receiver by treating Doppler rate (phase offset) as nuisance parameter in the hybrid channel estimation. For slowly changing channels, two simple adaptive equalization schemes, based on least squares (LS) and minimum mean-squared error (MMSE) principles, are proposed. For fast-changing channels, we adopt pilot-based channel estimation for equalization. We show the bit-error-rate (BER) performance of the OFDM detectors over a set of measured channel impulse responses in the northeastern sea of Taiwan. Simulation results reveal that adaptive equalizers and pilot-based equalizer can perform quite well in calm and fast-changing channel conditions respectively.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/37563
Appears in Collections:[電機工程學系] 期刊論文

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