An OFDM modulator including a predistortion module configured to receive the Nc consecutive data carriers and configured to compensate for distortion subsequently introduced by a polyphase filter bank connectable to the output of the OFDM modulator, a transformation module configured to apply a discrete inverse Fourier transform of constant size NIDFT independently of the numbering and transmission band used by the OFDM transmitter including the OFDM modulator, a filling module, the input of which is connected to the output of the predistortion module, and the output of which is connected to the input of the transformation module, and configured to insert (NIDFT−Nc) null carriers in succession to the Nc consecutive data carriers independently of the parity of the index i associated with the OFDM modulator.