OFDM TRANSMITTER CAPABLE OF IMPROVING TRANSMISSION RATE OF OFDM SIGNALS AND METHOD FOR COMPRESSING SIGNALS THEREOF

摘要

PURPOSE: An OFDM transmitter capable of improving a transmission rate of OFDM signals and a method for compressing signals thereof are provided to increase a transmission rate of whole data by reducing the length of one OFDM symbol. CONSTITUTION: An inverse fourier transform unit(200) transforms OFDM(Orthogonal Frequency Division Multiplexing) signals of a frequency domain into OFDM signals of a time domain through inverse fourier transform. An even function extracting unit(210) extracts an even function signal symmetrical to a y axis from the OFDM signals of the time domain. An odd function extracting unit(230) extracts an odd function signal symmetrical to the origin from the OFDM signals of the time domain. The even function signal is formed of the sum of a first even function signal and a second even function signal. A first selecting unit(213) selects anyone of the first even function signal and the second even function signal. The odd function signal is formed of the sum of a first odd function signal and a second odd function signal. A second selecting unit(233) selects anyone of the first odd function signal and the second odd function signal. A first cutting unit(215) takes one half signal of the selected even function signal. A second cutting unit(235) takes one half signal of the selected odd function signal.