Spread spectrum adaptive power control system and method

Claim 1

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 by comparing the received-power level to a threshold 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.

Claim 2

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 by comparing the received-power level to a threshold 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.

Claim 5

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, with the mobile station transmitting a first spread-spectrum signal, said system comprising: a base station having, automatic gain control (AGC) means, responsive to a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal and an AGC-control signal; base-correlator means for despreading the AGC-output signal as a despread AGC-output signal; power means for processing the despread AGC-output signal as a received-power level; comparator means for comparing the received-power level to a threshold level to generate a comparison signal; modulator means for converting the comparison signal to a power command signal; and transmitter means for transmitting the power-command signal as a second spread-spectrum signal; a mobile station having, despreader means for despreading the power-command signal from the second spread-spectrum signal as a power-adjust signal; decision means, responsive to the power-adjust signal, for increasing or decreasing a power level; and variable-gain means, responsive to said decision means, for adjusting a transmitter-power level of the first spread-spectrum signal.

Claim 6

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, with the mobile station transmitting a first spread-spectrum signal, said system comprising: a base station having, automatic gain control (AGC) means, responsive to a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal and an AGC-control signal; base-correlator means for despreading the AGC-output signal as a despread AGC-output signal; power means for processing the despread AGC-output signal as a received-power level; comparator means for comparing the received-power level to a threshold level to generate a comparison signal; modulator means for converting the comparison signal to a power command signal; and transmitter means for transmitting the power-command signal as a second spread-spectrum signal; a mobile station having, despreader means for despreading the power-command signal from the second spread-spectrum signal as a power-adjust signal; decision means, responsive to the power-adjust signal, for increasing or decreasing a power level; and variable-gain means, responsive to said decision means, for adjusting a transmitter-power level of the first spread-spectrum signal.

Claim 13

A method for adaptive-power control, from a base station, of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, with the mobile station transmitting a first spread-spectrum signal, said method comprising the steps of: generating, at said base station, from a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, an AGC-output signal; despreading, at said base station, the AGC-output signal as a despread AGC-output signal; processing, at said base station, the despread AGC-output signal to generate a received-power level; generating, at said base station, a comparison signal from comparing the received-power level to a threshold generating, at said base station, a power command signal responsive to said comparison signal; transmitting, from said base station, the power-command signal as a second spread-spectrum signal; despreading, at said mobile station, the power-command signal from the second spread-spectrum signal as a power-adjust signal; and adjusting, at said mobile station, responsive to the power-adjust signal, a transmitter-power level of the first spread-spectrum signal.

Claim 14

A method for adaptive-power control, from a base station, of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, with the mobile station transmitting a first spread-spectrum signal, said method comprising the steps of: generating, at said base station, from a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, an AGC-output signal; despreading, at said base station, the AGC-output signal as a despread AGC-output signal; processing, at said base station, the despread AGC-output signal to generate a received-power level; generating, at said base station, a comparison signal from comparing the received-power level to a threshold generating, at said base station, a power command signal responsive to said comparison signal; transmitting, from said base station, the power-command signal as a second spread-spectrum signal; despreading, at said mobile station, the power-command signal from the second spread-spectrum signal as a power-adjust signal; and adjusting, at said mobile station, responsive to the power-adjust signal, a transmitter-power level of the first spread-spectrum signal.

Claim 16

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 and an AGC-control signal, with the received signal including the first spread-spectrum signal and an interfering signal; a first combiner, coupled to said AGC circuit, for offsetting the AGC-control signal; a first weighting device, coupled to said first combiner, for weighting the AGC-control 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 demodulator, coupled to said power-measurement circuit, for demodulating data from the despread AGC-output signal; a second combiner, coupled to said power-measurement circuit, for offsetting the received-power level; a second weighting device, coupled to said second combiner, for weighting the received-power level; a third combiner, coupled to said second weighting device and to said first weighting device, for combining the received-power level and the AGC-control signal as an adjusted-received-power level; a comparator coupled to said power-measurement circuit through said third combiner for generating a comparison signal by comparing the adjusted-received-power level to a threshold 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 despreader coupled to said mobile antenna, for despreading the power-command signal from the second spread-spectrum signal as a power-adjust signal; a demultiplexer, coupled to said despreader, for demultiplexing the power-adjust signal from despread data; a decision device, coupled to said demultiplexer, for responding to the power-adjust signal; an accumulator, coupled to said decision device, for tracking previous power levels; 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 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.

Claim 17

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 and an AGC-control signal, with the received signal including the first spread-spectrum signal and an interfering signal; a first combiner, coupled to said AGC circuit, for offsetting the AGC-control signal; a first weighting device, coupled to said first combiner, for weighting the AGC-control 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 demodulator, coupled to said power-measurement circuit, for demodulating data from the despread AGC-output signal; a second combiner, coupled to said power-measurement circuit, for offsetting the received-power level; a second weighting device, coupled to said second combiner, for weighting the received-power level; a third combiner, coupled to said second weighting device and to said first weighting device, for combining the received-power level and the AGC-control signal as an adjusted-received-power level; a comparator coupled to said power-measurement circuit through said third combiner for generating a comparison signal by comparing the adjusted-received-power level to a threshold 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 despreader coupled to said mobile antenna, for despreading the power-command signal from the second spread-spectrum signal as a power-adjust signal; a demultiplexer, coupled to said despreader, for demultiplexing the power-adjust signal from despread data; a decision device, coupled to said demultiplexer, for responding to the power-adjust signal; an accumulator, coupled to said decision device, for tracking previous power levels; 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 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.

Claim 20

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, with the mobile station transmitting a first spread-spectrum signal, said system comprising: a base station having, automatic gain control (AGC) means, responsive to a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal and an AGC-control signal; first combining means for offsetting the AGC-control signal; first weighting means for weighting the offset AGC-control signal; base-correlator means for despreading the AGC-output signal as a despread AGC-output signal; power measurement means for processing the despread AGC-output signal as a received-power level; demodulating means for demodulating data from the despread AGC-output signal; second combining means for offsetting the received-power level; second weighting means for weighting the offset received-power level; third combining means for combining the weighted-offset-received-power level and the weighted-offset AGC-control signal as an adjusted-received-power level; comparator means for comparing the adjusted- received-power level to a threshold level and for outputting a power-control signal; delta modulating means for converting the power-control signal to a power-command signal; and transmitter means for transmitting the power-command signal as a second spread-spectrum signal; a mobile station having, despreading means for despreading the power-command signal from the second spread-spectrum signal as a power-adjust signal; decision means, responsive to the power-adjust signal, for increasing or decreasing a power level; accumulating means for tracking previous power levels; algorithm storing means for storing an algorithm to adjust a power level; and variable-gain means, responsive to said decision means and to said algorithm storing means, for adjusting a transmitter-power level of the first spread-spectrum signal.

Claim 21

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, with the mobile station transmitting a first spread-spectrum signal, said system comprising: a base station having, automatic gain control (AGC) means, responsive to a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, for generating an AGC-output signal and an AGC-control signal; first combining means for offsetting the AGC-control signal; first weighting means for weighting the offset AGC-control signal; base-correlator means for despreading the AGC-output signal as a despread AGC-output signal; power measurement means for processing the despread AGC-output signal as a received-power level; demodulating means for demodulating data from the despread AGC-output signal; second combining means for offsetting the received-power level; second weighting means for weighting the offset received-power level; third combining means for combining the weighted-offset-received-power level and the weighted-offset AGC-control signal as an adjusted-received-power level; comparator means for comparing the adjusted- received-power level to a threshold level and for outputting a power-control signal; delta modulating means for converting the power-control signal to a power-command signal; and transmitter means for transmitting the power-command signal as a second spread-spectrum signal; a mobile station having, despreading means for despreading the power-command signal from the second spread-spectrum signal as a power-adjust signal; decision means, responsive to the power-adjust signal, for increasing or decreasing a power level; accumulating means for tracking previous power levels; algorithm storing means for storing an algorithm to adjust a power level; and variable-gain means, responsive to said decision means and to said algorithm storing means, for adjusting a transmitter-power level of the first spread-spectrum signal.

Claim 28

A method for adaptive-power control, from a base station, of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, with the mobile station transmitting a first spread-spectrum signal, said method comprising the steps of: generating, at said base station, from a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, an AGC-output signal and an AGC-control signal; despreading, at said base station, the AGC-output signal as a despread-AGC-output signal; offsetting the AGC-control signal; weighting the offset-AGC-control signal; processing, at said base station, the despread AGC-output signal to generate a received-power level; offsetting the received-power level; weighting the offset-received-power level; combining the weighted-offset-received-power level and the weighted-offset-AGC-control signal as an adjusted-received power control signal; comparing the adjusted-received-power control signal to a threshold; generating, at said base station, a power-command signal from the comparison; transmitting, from said base station, the power-command signal as a second spread-spectrum signal; despreading, at said mobile station, the power-command signal from the second spread-spectrum signal as a power-adjust signal; tracking previous power levels; and adjusting, at said mobile station, responsive to the power-adjust signal and tracked previous power levels, a transmitter-power level of the first spread-spectrum signal.

Claim 29

A method for adaptive-power control, from a base station, of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation, with the mobile station transmitting a first spread-spectrum signal, said method comprising the steps of: generating, at said base station, from a received signal, with the received signal including the first spread-spectrum signal and an interfering signal, an AGC-output signal and an AGC-control signal; despreading, at said base station, the AGC-output signal as a despread-AGC-output signal; offsetting the AGC-control signal; weighting the offset-AGC-control signal; processing, at said base station, the despread AGC-output signal to generate a received-power level; offsetting the received-power level; weighting the offset-received-power level; combining the weighted-offset-received-power level and the weighted-offset-AGC-control signal as an adjusted-received power control signal; comparing the adjusted-received-power control signal to a threshold; generating, at said base station, a power-command signal from the comparison; transmitting, from said base station, the power-command signal as a second spread-spectrum signal; despreading, at said mobile station, the power-command signal from the second spread-spectrum signal as a power-adjust signal; tracking previous power levels; and adjusting, at said mobile station, responsive to the power-adjust signal and tracked previous power levels, a transmitter-power level of the first spread-spectrum signal.