OFDM SIGNAL TRANSMITTER, OFDM SIGNAL RECEIVER, MAPPING METHOD AND DE-MAPPING METHOD

摘要

PROBLEM TO BE SOLVED: To reduce instantaneous maximum power of a time waveform of an OFDM signal. SOLUTION: A signal space arrangement assignment section 3 is provided with pluralities of kinds of signal space arrangements and sets properly signal space arrangements for each subcarrier. A subcarrier mapping section 2 uses a set signal space arrangement to apply mapping to a received digital data series. Thus, a phase of the subcarrier differs at each signal space arrangement. An IFFT 4 applies IFFT processing to the subcarrier signal to obtain an OFDM time waveform. Since the phase of the subcarrier differs at each signal space arrangement, instantaneous maximum power of the OFDM time waveform is reduced.