초록 ▼

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 tim

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.

대표청구항 ▼

[ We claim:] [6.] A fuzzy-logic spread-spectrum adaptive power control method comprising the steps of:receiving at a base station a first spread-spectrum signal having a data channel;generating, at said base station, a first control signal and a second control signal;despreading, at said base statio

[ We claim:] [6.] A fuzzy-logic spread-spectrum adaptive power control method comprising the steps of:receiving at a base station a first spread-spectrum signal having a data channel;generating, at said base station, a first control signal and a second control signal;despreading, at said base station, a data channel signal embedded in the first spread-spectrum signal as a despread signal;sampling, at said base station, in response to the first control signal, the despread signal at a peak correlation time of the data channel signal to generate from the despread signal a signal level;sampling at the base station, in response to the second control signal, the despread signal at a non-peak correlation time of the data channel signal to generate from the despread signal a noise level;generating, at said base station, a signal-to-noise ratio from the signal level and the noise level;comparing, at said base station, the signal-to-noise ratio to a set of predetermined thresholds;generating, at said base station, an N-bit control signal responsive to a relationship between the signal-to-noise ratio and the set of predetermined thresholds, with N representing a number of bits in the control signal;transmitting, from said base station, the N-bit control signal embedded in a second spread-spectrum signal;receiving, at a remote unit, the second spread-spectrum signal;demodulating, at said remote unit, from the second spread-spectrum signal, the N-bit control signal embedded in the second spread-spectrum signal, as a demodulated-control signal;adjusting at said remote unit, in response to the demodulated-control signal, a transmitter power level; andtransmitting, from said remote unit, the first spread-spectrum signal.