Patent ID: 6671308
Filing Date: 2003-12-30
Classification: H03G,H04B,H04J,H04W

Abstract:
A system for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, comprising:a mobile station having a mobile transmitter coupled to a mobile antenna for transmitting a first spread-spectrum signal using radio waves; a base station having an automatic-gain-control (AGC) circuit, responsive to a received signal, for generating an AGC-output signal, with the received signal including the first spread-spectrum signal and an interfering signal; a base correlator coupled to said AGC circuit for despreading the AGC-output signal; a power-measurement circuit coupled to said base-correlator, for processing the despread AGC-output signal as a received-power level; a comparator coupled to said power-measurement circuit for generating a comparison signal using a threshold test and the received-power level; a power-command circuit coupled to said comparator and responsive to the comparison signal for generating a power-command signal; an antenna; a transmitter coupled to said antenna and to said power-command circuit for transmitting the power-command signal as a second spread-spectrum signal; and said mobile station further including a mobile correlator coupled to said mobile antenna for despreading the power-command signal from the second spread-spectrum signal as a power-adjust signal; a decision device coupled to said mobile correlator for responding to the power-adjust signal; an accumulator coupled to said decision device; a step-size algorithm device coupled to said decision device and to said accumulator for storing an algorithm for adjusting a power level; and a first variable-gain device coupled to said accumulator, responsive to the power-adjust signal, for adjusting a transmitter-power level of the first spread-spectrum signal transmitted from said mobile-transmitter.