
384 ◾ Mobile Ad Hoc Networks: Current Status and Future Trends
As we can see in these graphs, at high frequencies, there is a greater coefficient of absorption;
therefore, it would be better to work at low frequencies while the higher frequencies show a faster
rate. However, due to high absorption of seawater, an EM wave can hardly propagate in the sea-
water. is is the main motivation for working at a lower frequency in media of high conductiv-
ity. Seawater is a good example of this type of medium. erefore, communication in seawater is
impractical using classical approaches based on wave propagation.
14.2.2 Underwater Communications Based on Op ...