Abstract
The popularity of underwater applications has been growing due to the major technological advances in the last few decades. Yet, direct communication from an airborne node to an underwater node remains challenging due to the inability of any known signal which propagates well in both the air and water mediums. Photoacoustic energy transfer is a promising mechanism for enabling such cross-medium communication. Although the use of the photoacoustic mechanism is quite common in medical imaging, little progress has been made on building the communication protocol stack. Most research studies have only focused on characterizing the channel and relating the laser and acoustic signals. Little attention has been given to developing suitable modulation and demodulation schemes. This paper fills such a technical gap and proposes a novel OOK modulation scheme using peak detection technique. We validate the effectiveness of our proposed scheme through simulation and lab experiments.
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