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The results are shown in this figure.
As can be seen, for each baud rate, the bit error rate increased with increasing distance.
Also, for each distance, the bit error rate increased with increasing baud rate.
Here, at each baud rate, no communication was possible beyond 6 m.
To increase the communication distance, we must consider improvements such as increasing the speaker volume, using a microphone with better performance, and using a frequency with less noise.
These improvements are for future work.
Also, to carry out future experiments underwater, we must use either waterproof cases or a waterproof microphone and speaker.
Experiments in water constitute a also future topic.
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IEEE/ICACT20210234 Slide.17
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