Efficient communication over highly spread underwater acoustic channels
Proceedings of the second workshop on Underwater networks
Wireless Communications
Wireless Communications Over Rapidly Time-Varying Channels
Wireless Communications Over Rapidly Time-Varying Channels
Discrete time-scale characterization of wideband time-varying systems
IEEE Transactions on Signal Processing
Joint scale-lag diversity in wideband mobile direct sequence spread spectrum systems
IEEE Transactions on Wireless Communications
Iterative Carrier Frequency Offset and Channel Estimation for Underwater Acoustic OFDM Systems
IEEE Journal on Selected Areas in Communications
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Underwater acoustic (UWA) communication channels suffer from long delay spreads and significant Doppler effects. Such channels are also ultrawideband in nature. Thus, the typical UWA distortion can be well-described by a multi-scale multi-lag (MSML) channel model. Many UWA communication systems employ resampling by a single-scale at the front-end to compensate for the scale effects of UWA channels. In this paper, the optimal resampling factor for OFDM signaling over MSML channels is investigated from a Bayesian perspective. The resampling factor is selected to minimize the inter-carrier interference resulting from the MSML channel. The exact interference power is computed, but is intractable for optimization, thus an upper bound is employed for optimization. Numerical results verify the tightness of the bound and the Bayesian approach is compared to deterministic methods previously derived for resampling in MSML channels.