Patent ID: 9548777
Date: 2017-01-17
CPC Classifications: H03G,H04B

Claim:
1. A reception device comprising: a low noise amplifier configured to amplify a radio signal received by an antenna by a first gain; a variable gain amplifier configured to amplify an output signal of the low noise amplifier by a second gain; an analog-to-digital converter configured to convert an output signal of the variable gain amplifier into a digital signal; a gain controller configured to control, when an amplitude of the radio signal exceeds a predetermined threshold value, the first gain and the second gain corresponding to the amplitude of the radio signal the gain controller in accordance with a predetermined control rule such that an amplitude of the digital signal approximates a target value, when the amplitude of the radio signal exceeds the threshold value, and to complete the controlling within a predetermined gain control period; a saturation detection unit configured to detect saturation of the analog-to-digital converter based on the output signal of the low noise amplifier or the digital signal; and a demodulation unit configured to demodulate the digital signal and to acquire thereby a destination address contained in the radio signal, wherein if the acquired destination address does not correspond to the reception device and the saturation is detected by the saturation detection unit after controlling the first gain and the second gain within the predetermined gain control period, the gain controller controls the first gain and the second gain a second time to adjust the amplitude of the radio signal such that a sum of the first gain and the second gain is lowered until an amplitude of the digital signal approximates the target value.