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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorGenichiro Ohta
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It is possible to form an OFDM signal improving frequency use efficiency. An OFDM modulation apparatus includes Nyquist filters (104, 126) for Nyquist-shaping signals (S10, S20) of two systems, delay apparatuses (123, 124) for delaying a signal of one system at ½ of the symbol period T, inverse Fourier transformers (105, 127) for OFDM-processing the respective signals after the Nyquist formation, and a switching section (130) combining the signals of the two systems by selectively outputting the signals of the two systems subjected to the OFDM processing while switching the signals at a ½ interval of the symbol period. Thus, it is possible to multiplex the two OFDM signals without interfering each other. As a result, it is possible to realize an OFDM modulation device (100) reaching twice as much as frequency use efficiency as compared to the conventional OFDM signal (i.e., reaching twice as much as the information transmission with the same frequency band as the conventional one.)
An orthogonal frequency division multiplexing modulating apparatus comprising:
An orthogonal frequency division multiplexing demodulating apparatus comprising:
An orthogonal frequency division multiplexing modulating method comprising a step of selectively switching and synthesizing a first orthogonal frequency division multiplexing signal and a second orthogonal frequency division multiplexing signal formed after Nyquist formation and including respectively differential delay of half of the symbol period.
An orthogonal frequency division multiplexing demodulating method comprising the steps of:
Dependencies are inferred from the claim text.