| 摘要 |
<P>PROBLEM TO BE SOLVED: To control gain so as to obtain an SNR required for demodulation processing. <P>SOLUTION: A receiver according to an embodiment includes a variable gain amplifier, a comparator and a signal processing unit. The variable gain amplifier is capable of amplifying a first reception signal to generate a second reception signal, and changing the gain of amplifying the first reception signal. The comparator compares a signal level of the second reception signal with a first threshold, and generates a third reception signal whose signal level is "High" in the case where the signal level is higher than the first threshold and whose signal level is "Low" lower than "High" in the case where the signal level is equal to or below the first threshold. The signal processing part determines that the signal is present in the case where the temporal proportion of "High" in the third reception signal exceeds a second threshold, performs control of the gain and demodulation process on the basis of the determination result, and sets the second threshold for a first period, in which gain control is performed, to a value larger than the second threshold for a second period, in which the demodulation process is performed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
