Spread spectrum adaptive power control system and method

Claim 1

A system for adaptive-power control of a spread-spectrum transmitter operating in a cellular-communication network using spread-spectrum modulation, comprising: a mobile station having a mobile transmitter coupled to a mobile antenna for transmitting a 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; 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 power-command circuit coupled to said power measurement circuit for generating, responsive to a relationship between the received-power level and a threshold power level, a power-command signal; an antenna; a transmitter coupled to said antenna and to said power-command circuit for transmitting the power-command signal; and said mobile station further including a mobile correlator coupled to said mobile antenna for despreading the power-command signal as a power-adjust signal; and a first variable-gain device coupled to said mobile correlator, responsive to the power-adjust signal, for adjusting a transmitter-power level of the spread-spectrum signal transmitted from said mobile-transmitter.

Claim 2

A system for adaptive-power control of a spread-spectrum transmitter operating in a cellular-communication network using spread-spectrum modulation, comprising: a mobile station having a mobile transmitter coupled to a mobile antenna for transmitting a 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; 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 power-command circuit coupled to said power measurement circuit for generating, responsive to a relationship between the received-power level and a threshold power level, a power-command signal; an antenna; a transmitter coupled to said antenna and to said power-command circuit for transmitting the power-command signal; and said mobile station further including a mobile correlator coupled to said mobile antenna for despreading the power-command signal as a power-adjust signal; and a first variable-gain device coupled to said mobile correlator, responsive to the power-adjust signal, for adjusting a transmitter-power level of the 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 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 spread-spectrum signal, for generating an AGC-output signal; power means for processing the 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; and modulator means for converting the comparison signal to a power-command signal; said mobile station having, means for receiving the power-command signal as a power-adjust signal; and variable-gain means, responsive to said power-adjust signal, for adjusting a transmitter-power-level of the 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 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 spread-spectrum signal, for generating an AGC-output signal; power means for processing the 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; and modulator means for converting the comparison signal to a power-command signal; said mobile station having, means for receiving the power-command signal as a power-adjust signal; and variable-gain means, responsive to said power-adjust signal, for adjusting a transmitter-power-level of the spread-spectrum signal.

Claim 15

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; processing, at said base station, the AGC-output signal to generate a received-power level; comparing the received-power level to a threshold; generating, responsive to the comparison between the received-power level and the threshold, a power-command signal; receiving, at said mobile station, the power-command 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 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; processing, at said base station, the AGC-output signal to generate a received-power level; comparing the received-power level to a threshold; generating, responsive to the comparison between the received-power level and the threshold, a power-command signal; receiving, at said mobile station, the power-command 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 19

A system for adaptive-power control of a spread-spectrum transmitter operating in a cellular-communication 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 weighting device, coupled to said automatic-gain-control circuit, 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 second weighting device, coupled to said power measurement circuit, for weighting the received-power level; a combiner, coupled to said second weighting device and to said first weighting device, for combining the weighted-received-power level and the weighted-AGC-control signal as an adjusted-received-power level; and a power-command circuit coupled to said combiner for generating, responsive to a relationship between the adjusted-received-power level and a threshold level, a power-command signal; said mobile station further including a despreader for despreading the power-command signal as a power-adjust signal; and a variable-gain device, 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 operating in a cellular-communication 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 weighting device, coupled to said automatic-gain-control circuit, 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 second weighting device, coupled to said power measurement circuit, for weighting the received-power level; a combiner, coupled to said second weighting device and to said first weighting device, for combining the weighted-received-power level and the weighted-AGC-control signal as an adjusted-received-power level; and a power-command circuit coupled to said combiner for generating, responsive to a relationship between the adjusted-received-power level and a threshold level, a power-command signal; said mobile station further including a despreader for despreading the power-command signal as a power-adjust signal; and a variable-gain device, responsive to the power-adjust signal, for adjusting a transmitter-power level of the first spread-spectrum signal transmitted from said mobile-transmitter.

Claim 23

A system for adaptive-power control of a spread-spectrum transmitter of a motile 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 weighting means for weighting the 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; second weighting means for weighting the received-power level; combining means for combining the weighted-received-power level and the weighted-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; and delta modulating means for converting the power-control signal to a power-command signal; said mobile station having, correlator means for despreading the power-command signal as a power-adjust signal; and variable-gain means, responsive to said power-adjust signal, for adjusting a transmitter-power level of the first spread-spectrum signal.

Claim 24

A system for adaptive-power control of a spread-spectrum transmitter of a motile 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 weighting means for weighting the 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; second weighting means for weighting the received-power level; combining means for combining the weighted-received-power level and the weighted-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; and delta modulating means for converting the power-control signal to a power-command signal; said mobile station having, correlator means for despreading the power-command signal as a power-adjust signal; and variable-gain means, responsive to said power-adjust signal, for adjusting a transmitter-power level of the first spread-spectrum signal.

Claim 31

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, an AGC-output signal and an AGC-control signal; despreading, at said base station, the AGC-output signal as a despread-AGC-output signal; weighting the AGC-control signal; processing, at said base station, the despread AGC-output signal to generate a received-power level; weighting the received-power level; combining the weighted-received-power level and the weighted-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; despreading, at said mobile station, the power-command 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 32

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, an AGC-output signal and an AGC-control signal; despreading, at said base station, the AGC-output signal as a despread-AGC-output signal; weighting the AGC-control signal; processing, at said base station, the despread AGC-output signal to generate a received-power level; weighting the received-power level; combining the weighted-received-power level and the weighted-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; despreading, at said mobile station, the power-command 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.