Patent ID: 7116942

Claim:
A radio communication apparatus comprising: an antenna which receives a radio signal and outputs the same as a reception signal; a radio signal processing section which frequency-converts and amplifies the reception signal and produces a first signal; a power calculation section which calculates a power value of the first signal and produces a power value signal; a first detection section which detects a beginning timing of the reception signal using the power value signal, and produces a first detection signal including information of the beginning timing of the reception signal in accordance with the detection result; a correlation detection section which produces a correlative value signal in accordance with correlation between the first signal and a known signal; a second detection section which detects a beginning timing of the reception signal using the correlative value signal, and produces a second detection signal including information of the beginning timing of the reception signal in accordance with a detection result; a select control section which is supplied with the first detection signal and the second detection signal and selectively outputs one of the first detection signal and the second detection signal; and a demodulation section which demodulates a data signal from the first signal using an output signal from the select control section.