OFDM: Orthogonal frequency division plywood. Designates a special implementation of multicarrier modulation, a modulation method that uses multiple orthogonal carrier signals for digital data transmission. The method is a special form of FDM, in which the carrier is orthogonal crosstalk between signals modulated onto adjacent carriers.
Each individual carrier is phase and/or amplitude modulated and can therefore carry information from several bits per symbol. The number of bits per symbol is, for example, one bit/symbol in DAB, two, four or six bits/symbol DVB-T and at eight bits/symbol DVB-T2. This modulation method uses all three free parameters frequency, amplitude and Phase for the transmission of information. Application examples for OFDM are e.g. B. DAB, DRM, DVB-T or ADSL.