Howtosignalprocessing
- Why acoustic communication is preferred over EM wave communication in the case of underwater communication?
- How does underwater acoustic communication work?
- How is electromagnetic induction used in wireless communication?
Why acoustic communication is preferred over EM wave communication in the case of underwater communication?
Communicating at a high data rate in underwater channel is challenging. Such communications must be acoustic in order to travel long distances. The underwater acoustic channel has a long delay spread, which makes orthogonal frequency division multiplexing (OFDM) an attractive communication scheme.
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.
How is electromagnetic induction used in wireless communication?
The principle of electromagnetic induction wireless transmission is similar to the working principle of the transformer in our life, that is, the excitation side coil forms an alternating magnetic field, and the induced electromotive force is generated on the other side coil, thereby realizing energy transmission.
