| 摘要 |
PROBLEM TO BE SOLVED: To ensure the excellent utilization efficiency of a frequency and a time by contriving an information transmitting method of a modulation system of each subcarrier while maintaining a high transmission capacity by controlling a modulation system of each subcarrier and transmission power depending on a propagation situation. SOLUTION: An OFDM signal transmitter is arranged to transmit a parity for information about a modulation system of each subcarrier obtained by an adaptive modulation operating unit. An OFDM signal receiver comprises an adaptive modulation estimation unit for estimating the modulation system and the transmission power of each subcarrier by the same algorithm as the adaptive modulation operating unit and calculating a parity for the modulation system information of each subcarrier which is thus estimated, and a modulation system correction unit for comparing the parity of each subcarrier with the parity of each subcarrier transmitted from the OFDM signal transmitter, determining that the modulation system and the transmission power of subcarrier are estimated correctly if both parities coincide with each other, correcting the modulation system and the transmission power of a subcarrier if both parities do not coincide with each other, and providing them to a parallel-series converter. COPYRIGHT: (C)2008,JPO&INPIT
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