An emitter for modulating and emitting an orthogonal frequency division multiplexing signal through a transmission channel (TC), comprising a frequency-to-time converter for converting symbols to be transmitted into time symbols, and means for serializing and amplifying said time symbol so as to emit it as an OFDM signal through said transmission channel, said emitter further comprising: means (12) for clipping said time symbols; time-to-frequency convertor (13) for converting said time symbols; and means for applying a set of data subcarriers of the outputs of said time-to-frequency converter as inputs of said frequency-to-time converter wherein out-of-band subcarriers are set to zero and the clipping level is set to a minimum level allowing the amplifier to operate in an efficient region.