Patent ID: 6766156
Filing Date: 2004-07-20
Classification: H04B,H04W,Y02D

Abstract:
A radio-transmitter receiver for simultaneously transmitting/receiving a radio signal including an amplitude variation component, comprising:a receiving radio-frequency unit having a first operation mode in which an operation is executed at a predetermined first consumption value and with predetermined first distortion characteristics, and a second operation mode in which an operation is executed at a second current consumption value larger than said first current consumption value and with second distortion characteristics having less distortion than said first distortion characteristics; mode changing control means for allowing said receiving radio-frequency unit to be operated in said second operation mode in a period in which the radio signal is transmitted, or in said first operation made in a period in which the radio signal is not transmitted; open-loop transmission control means for detecting a receiving level of the radio signal on the basis of a received signal level which is output from said receiving radio-frequency unit, and generating a transmission level control signal on the basis of the detection value so as to variably control a transmitting level of the radio signal; and variation suppressing means for canceling variation components generated in the transmission level control signal generated in said open-loop transmission control means by the changing of the first operation mode or the second operation mode in said receiving radio-frequency unit.