Principles of mobile communication (2nd ed.)
Principles of mobile communication (2nd ed.)
The Underwater Acoustic MIMO OFDM System Channel Equalizer Basing on Independent Component Analysis
CMC '09 Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 02
Signal processing for underwater acoustic communications
IEEE Communications Magazine
An underwater acoustic implementation of DFT-spread OFDM
EURASIP Journal on Advances in Signal Processing - Special issue on advances in signal processing for maritime applications
IEEE Transactions on Signal Processing - Part I
Intercarrier interference in MIMO OFDM
IEEE Transactions on Signal Processing
Time-Variant Channel Estimation Using Discrete Prolate Spheroidal Sequences
IEEE Transactions on Signal Processing
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Shallow underwater acoustic (UWA) channel exhibits rapid temporal variations, extensive multipath spreads, and severe frequency-dependent attenuations. So, high data rate communication with high spectral efficiency in this challenging medium requires efficient system design. Multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO---OFDM) is a promising solution for reliable transmission over highly dispersive channels. In this paper, we study the equalization of shallow UWA channels when a MIMO---OFDM transmission scheme is used. We address simultaneously the long multipath spread and rapid temporal variations of the channel. These features lead to interblock interference (IBI) along with intercarrier interference (ICI), thereby degrading the system performance. We describe the underwater channel using a general basis expansion model (BEM), and propose time-domain block equalization techniques to jointly eliminate the IBI and ICI. The block equalizers are derived based on minimum mean-square error and zero-forcing criteria. We also develop a novel approach to design two time-domain per-tone equalizers, which minimize bit error rate or mean-square error in each subcarrier. We simulate a typical shallow UWA channel to demonstrate the desirable performance of the proposed equalization techniques in Rayleigh and Rician fading channels.