| 摘要 |
A carrier detecting circuit in a receiver of a wireless device has a circuit for determining a power value of a received signal, a circuit for determining a correlation value between a preamble included in the received signal and a predetermined preamble pattern which characterizes a communication system to which the wireless device belongs, a circuit for judging that a carrier is detected and tentatively instructing a demodulating circuit of the wireless device to start a demodulating process of a signal if the power value exceeds a first threshold value or the correlation value exceeds a second threshold value, and a circuit for instructing the demodulating circuit to stop the demodulating process which has tentatively been started if it is judged that the correlation value does not exceed the second threshold value during a predetermined first time interval.
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