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A Time-domain EQualizer (TEQ) is proposed for MIMO-OFDM transmission in Under-Water Acoustic (UWA) channels that simultaneously exhibit large delay and doppler spreads. The aim of the equalizer is to jointly mitigate the Inter-Carrier Interference (ICI) and Inter-Block Interference (IBI). In this paper, the well known Basis Expansion Model (BEM) is used to describe the UWA channel. Then, the equalizer is derived based on maximizing the Signal-to-Interference-plus-Noise-Ratio (SINR). The performance of the proposed approach is demonstrated by numerical simulations. Also, a previously proposed Frequency-domain EQualizer (FEQ) for communication over doubly selective radio channels is applied to UWA channel and its performance is compared to that of the proposed TEQ.
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