Orthogonal frequency division multiplexing

Orthogonal frequency division multiplexing (ODFM) is a method of digital modulation causing a signal to be split into several narrowband channels at differing frequencies. It was invented between 1960 and 1970, in order to minimise interference between near channels. A similar technology is Frequency-division multiplexing. Digital television and voice broadcasts are two implementations of this technology, which is widely used in Europe.