Fuzzy-logic spread-spectrum adaptive power control

Pulse or digital communications – Repeaters – Testing

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375205, 375227, 455 69, 455 70, 4552263, 370318, 395 3, H04B 1500

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active

057198985

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.

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R.F. Ormondroyd,"Power Control For Spread-Spectrum Systems", Conference on Communications Equipment and Systems; Apr. 20-22, 1982, pp. 109-115.

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