Patent ID: 7639997
Filing Date: 2009-12-29
Classification: H04B,H04L

Abstract:
1. A radio communication system comprising: a local oscillator; a selection unit that receives an input signal and an oscillation output signal of said local oscillator as inputs and selectively outputs one of said received signals; a low noise amplifier that is capable of hopping a frequency band to be amplified and amplifies an output of said selection unit; a mixer that integrates the oscillation output signal of said local oscillator and an output signal of said low noise amplifier; an intensity discriminating unit that discriminates signal intensity of an output of said mixer; and a control unit that controls a selection operation of said selection unit and a frequency band of said low noise amplifier, wherein said control unit learns a frequency band of said low noise amplifier for maximizing the signal intensity on the basis of a discrimination result of said intensity discriminating unit in a first state where said selection unit is controlled to selectively output the oscillation output signal of said local oscillator, and said control unit sets said frequency band learned in the first state in said low noise amplifier in a second state where said selection unit is controlled to selectively output said input signal.