Orthogonal frequency-division multiplexing

Orthogonal Frequency Division Multiplexing is a technology related to Frequency Division Multiplexing. With it, many different signals can be sent over the same medium, at the same time. Each signal uses a different basis function. By using the basis function given, the sender and recipient will then see "their" signal better, the other signals will be clearly separated. 
Uses.
Many technologies use OFDM. Among them are: