Patent ID: 9215122
Filing Date: 2015-12-15
Classification: H03G,H04B,H04L

Abstract:
1. A radio communication apparatus comprising: a mixer that generates an analog signal of an intermediate frequency by mixing a local signal having a frequency with an analog signal of a radio frequency; an analog-to-digital converter that converts the generated analog signal of the intermediate frequency into a digital signal in a time-domain; a Fourier transformer that transforms the digital signal in the time-domain into a frequency-domain signal; a level comparator that, until when a desired signal is received in a reception mode, extracts a portion of the frequency-domain signal output from the Fourier transformer, the portion matching with a frequency of the desired signal, compares a reception level of the extracted portion with a threshold value, and determines whether or not an interference signal exists based on the comparison result; and a LO frequency controller that sets the frequency of the local signal based on the determination result such that a frequency of intermodulation distortion caused by the interference signal becomes an intermediate frequency of the frequency band of the desired signal, wherein the local signal of the frequency set by the LO frequency controller is output to the mixer during the reception mode.