PURPOSE: A method for modulating OFDM multiple carrier of a digital broadcasting signal using a time domain synchronous OFDM receiver is provided to obtain optimum transmission parameters by selectively deciding a range of numbers of subcarriers corresponding to a valid bandwidth for fast fourier transform. CONSTITUTION: A serial/parallel converter(120) converts serial TS(Transport Stream) signals into parallel TS signals. An orthogonal phase modulating unit(140) modulates the parallel TS signals through orthogonal phase modulation. An IFFT(Inverse Fast Fourier Transform) unit(160) transforms the modulated parallel stream signals through inverse fast fourier transform for obtaining OFDM(Orthogonal Frequency Division Multiplexing) multiple carrier modulated OFDM signals. A parallel/serial converter(180) converts the OFDM signals into serial signals.
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