| 摘要 |
For transmission, a modulation method with a high bit rate is applied to subchannels with good transmission path characteristics, and a modulation method with a low bit rate is applied to subchannels with poor transmission path characteristics. In doing this, transmission path characteristic detection units 19 and 29 detect information on transmission path characteristics from received signals, and maximum bit-rate calculation units 20 and 30 use a minimization algorithm of a matroid convex function in order to determine a combination of values of transmission power for each of the subchannels that results in the maximum bit rate of the entire band. A combination of the determined transmission power and the modulation method (bit rate) is used for transmitting signals.
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