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Underwater acoustic orthogonal frequency division multiplexing OFDM enables simple frequency domain equalization, but its performance is often limited by InterCarrier Interference ICI that is induced by channel variation, in addition to the ambient noise. As the signal itself, the variance of the ICI is frequency dependent as the transmitter often has a non-ideal transmit voltage response TVR and underwater acoustic propagation introduces frequency dependent attenuation. In this paper, a simple method to account for the frequency dependent spectrum of the ICI plus noise is proposed.
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