ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING OPTICAL TRANSMITTING DEVICE, A TRANSMITTING METHOD THEREOF, AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING OPTICAL RECEIVING DEVICE, AND A RECEIVING METHOD THEREOF FOR IMPROVING THE QUALITY OF AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING OPTICAL SIGNAL

摘要

PURPOSE: An OFDM(Orthogonal Frequency Division Multiplexing) optical transmitting device, a transmitting method thereof, an orthogonal frequency division multiplexing optical receiving device, and a receiving method thereof are provided to amplify a signal by differentiating the amplification ratio corresponding to the amplitude of the signal which is modulated with an OFDM method in an OFDM optical transmitting process.;CONSTITUTION: A signal amplitude control unit(130) amplifies a plurality of data signals modulated with an OFDM method by using other amplification factors corresponding to amplitudes of the data signals. A serial-parallel conversion unit(110) converts a serial data bit into a parallel data bit. A symbol mapper(115) performs symbol mapping of the parallel data bit. A training symbol insertion unit(120) inserts a training symbol into the plurality of data signals. An IFFT(Inverse Fast Fourier Transform) unit(125) performs IFFT of the plurality of data signals.;COPYRIGHT KIPO 2013;[Reference numerals] (110) Serial-parallel conversion unit; (115) Symbol mapper; (120) Training symbol insertion unit; (130) Signal amplitude control unit; (135) Parallel-serial conversion unit; (140) Guard interval insertion unit; (150) I/Q modulator