| 摘要 |
Channel quality estimating section 104 estimates the channel quality from the reception signal quality and outputs the result to transmission method determining section 105 and control signal dividing section 108 . Transmission method determining section 105 determines a transmission method of a signal transmitted to communication partner from channel conditions and outputs the result to switch 106 , switch 107 and control signal dividing section 108 . Control signal dividing section 108 divides the transmission method information into high-speed control signal which is transmitted periodically and low-speed control signal which is transmitted on demand rather than periodically. Moreover, control signal dividing section 108 determines the combinations of low-speed control signal and high-speed control signal outputted from a tendency of communication quality, and outputs the result to modulator 114 . Modulator 114 modulates the high-speed control signal and low-speed control signal, and outputs the result to multiplexer 115.
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