Howtosignalprocessing
- Which communication system is preferred for underwater communication?
- How does underwater acoustic communication work?
- What makes it difficult to communicate using sound underwater?
- What type of mathematical channel is represented by an underwater acoustic system having multiple path channel?
Which communication system is preferred for underwater communication?
OFDM is a favorable communication scheme in underwater acoustic communications thanks to its resilience against frequency selective channels with long delay spreads.
How does underwater acoustic communication work?
An underwater transmitter directs a sonar signal to the water's surface, causing tiny vibrations that correspond to the 1s and 0s transmitted. Above the surface, a highly sensitive receiver reads these minute disturbances and decodes the sonar signal.
What makes it difficult to communicate using sound underwater?
This is because underwater communication uses acoustic waves instead of electromagnetic waves, which are less efficient. Above ground, high frequency radio waves transmit data at near-light speeds, but in the ocean, signals must pass through water and issues pile up quickly.
What type of mathematical channel is represented by an underwater acoustic system having multiple path channel?
Underwater acoustic channel is a kind of parametric channel, and its characteristic parameters change randomly with the change of space, time and frequency.
