Communications engineering. COFDM is used for mobile television, for the terrestrial transmission of digital TV and for WLANs.
COFDM enhances OFDM with a forward error correction. It is a multi carrier technique with up to several thousand subcarriers, where the distance is chosen so that a wave maximum of one carrier coincidences with the wave minima of the adjacent carriers thus avoiding interferences. For the vector modulation of the information signal on to the carrier DQPSK, DBPSK, QPSK or one of the QAM methods are applied.
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