Angular imaging multiple-input--multiple-output (A-MIMO) is investigated for short-range, high-speed underwater wireless optical communications (UWOCs) where, unlike conventional MIMO (C-MIMO), data are transmitted in an angle rather than space. In this approach, the strict requirements of on-axis alignment and fixed channel length relaxed. This technique also allows simpler estimation relative...

It is challenging to design an equalizer for the complex time-frequency doubly-selective channel. In this paper, we employ deep unfolding approach establish underwater acoustic (UWA) orthogonal frequency division multiplexing (OFDM) system, namely UDNet. Each layer of UDNet designed according classical minimum mean square error (MMSE) equalizer. Moreover, consider QPSK equalization as a four-cl...

In this paper, an effective method of underwater coherent optical wireless communication (UCOWC) with a simplified detection scheme is proposed. The proof-of-concept experiments M-ary PSK have been conducted common laser used for the signal source and local oscillator (LO). BER performance has evaluated at different channel attenuations maximum achievable attenuation length (AL) below forward e...

Predicting the channel quality for an underwater acoustic communication link is not a straightforward task. Previous approaches have focused on either physical observations of weather or engineered signal features, some which require substantial processing to obtain. This work applies convolutional neural network impulse responses, allowing learn features that are useful in predicting quality. ...