Patent ID: 6205189
Filing Date: 2001-03-20
Classification: H04W

Abstract:
A digital automatic gain control device for use in a transmitting/receiving terminal of a mobile radio communication system, comprising:a transmission power amplifier and a reception power amplifier, gains of said transmission power amplifier and reception power amplifier being digitally controlled;a control processor for generating a digital transmission gain control signal of a next transmission frame based on transmission power level control information transmitted from a base station, and for setting a gain of said reception power amplifier for receiving a next reception frame after receiving one reception frame;a received signal strength indication detector for detecting a received signal strength indication from said received reception frame;an analog-to-digital converter for converting said received signal strength indication into a digital signal based on a sampling clock signal generated from said control processor;a transmission gain control code mapping device for mapping said digital transmission gain control signal into a transmission gain control code for varying said gain of said transmission power amplifier;a reception gain control code mapping device for mapping an output from said analog-to-digital converter into a reception gain control code for varying said gain of said reception power amplifier;a selection controller for generating a selection control signal for selecting one of a transmission mode and a reception mode, based on a combination of timing signals and a multiplexing control clock signal generated from said control processor;a multiplexer for selecting one of said transmission gain control code and said reception gain control code in response to said selection control signal;a timing controller for generating transmission and reception timing control signals in response to further timing signals generated from the control processor;a transmission data latch for receiving said transmission gain control code output by said multiplexer and for providing said transmission gain control code to said transmission power amplifier in response to said transmission timing control signal; anda reception data latch for receiving said reception gain control code from said multiplexer and for providing said reception gain control code to said reception power amplifier in response to said reception timing control signal.