Patent ID: 7907675

Claim:
A radio communication system employing multi-carrier modulation for determining a transmission format in accordance with a reception quality of a first communication device and for transmitting data from a second communication device to the first communication device in the transmission format, the system comprising: measuring means for measuring an interference level as a condition of the reception quality; selection means for selecting a transmission format from a transmission format candidate group, based on the measured interference level; and radio communication means for transmitting data from the second communication device to the first communication device in the transmission format selected by the selection means, wherein the transmission format candidate group comprises a first transmission format and a second transmission format having a same coding rate, the second transmission format being a transmission format which subjects transmission data to repetition at more than two times after interleaving, and wherein an interference level in a case in which the selection means selects the second transmission format is higher than an interference level in a case in which the selection means selects the first transmission format.