US 5,963,583 AGranted

Fuzzy-logic spread-spectrum adaptive power control

AssigneeGolden Bridge Technology, Inc.

InventorsSorin Davidovici, Emmanuel Kanterakis

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Abstract

A fuzzy-logic spread-spectrum adaptive power control system comprising a base station and a plurality of remote units. The base station receives a spread-spectrum signal, and samples the despread spread-spectrum signal at a peak correlation time of the data channel, and at a non-peak correlation time of the data channel. This in turn generates a signal level and a noise level, respectively. A signal-to-noise ratio calculator generates a signal-to-noise ratio from the signal level and the noise level. A fuzzy-logic controller compares the signal-to-noise ratio to a set of predetermined thresholds, and using a state machine, generates a control signal which is thereby transmitted to the remote unit, indicating the amount by which to increase or decrease transmitted power. Each remote unit demodulates the control signal, and a transmitter controller adjusts a power level of the remote-unit spread-spectrum transmitter.

Claims7

Dependent claims

A fuzzy-logic spread-spectrum system for adaptive power control from a base station comprising:

a base antenna for receiving a first spread-spectrum signal having a pilot channel and a data channel;
a pilot-channel despreader operatively coupled to said base antenna for despreading a pilot channel signal embedded in the first spread-spectrum signal and for generating from the despread pilot channel signal a timing signal;
a sample-and-hold controller, coupled to said pilot-channel despreader, responsive to the timing signal for generating a first control signal and a second control signal;
a data-channel despreader, coupled to said base antenna, for despreading a data channel signal embedded in the first spread-spectrum signal as a despread signal;
a sample-and-hold circuit, operatively coupled to said data-channel despreader and to said sample-and-hold controller, responsive to the first control signal for sampling the despread signal at a peak correlation time of the data channel signal to generate from the despread signal a signal level, and responsive to the second control signal, for sampling the despread signal at a non-peak correlation time of the data channel signal to generate from the despread signal a noise level;
a first register coupled to said sample-and-hold circuit for storing the signal level;
a second register coupled to said sample-and-hold circuit for storing the noise level;
a signal-to-noise ratio calculator coupled to said first register and to second register, for generating a signal-to-noise ratio from the signal level and the noise level;
a fuzzy-logic controller coupled to said signal-to-noise ratio calculator for comparing the signal-to-noise ratio to a predetermined set of thresholds to generate a control signal;
and
a base spread-spectrum transmitter, coupled to said fuzzy-logic controller, for transmitting the control signal to a remote unit for adjusting a transmitter power level of said remote unit.

8 more elements

A fuzzy-logic spread-spectrum system for adaptive power control from a base station comprising:

a base antenna for receiving a spread-spectrum signal;
a sample-and-hold controller for generating a first control signal and a second control signal;
a data-channel despreader, coupled to said base antenna, for despreading a data signal embedded in the spread-spectrum signal as a despread signal;
a sample-and-hold circuit, operatively coupled to said data-channel despreader and to said sample-and-hold controller, responsive to the first control signal, for sampling the despread signal at a peak correlation time of the data signal to generate from the despread signal a signal level and, responsive to the second control signal, for sampling the despread signal at a non-peak correlation time of the data signal to generate from the despread signal a noise level;
a signal-to-noise ratio calculator coupled to said first register and to said second register, for generating a signal-to-noise ratio from the signal level and the noise level;
a fuzzy-logic controller, coupled said signal-to-noise ratio calculator, for comparing the signal-to-noise ratio to a predetermined threshold to generate a control signal;
and
a base spread-spectrum transmitter, coupled to said fuzzy-logic controller, for transmitting the control signal to remote unit for adjusting a transmitter power level of said remote unit.

5 more elements

Dependencies are inferred from the claim text.