초록 ▼

An automatic power control (APC) system for a spread-spectrum communications system includes an automatic forward power control (AFPC) system, and an automatic reverse power control (ARPC) system. In the AFPC, each subscriber unit (SU) measures a forward signal-to-noise ratio of a respective forward

An automatic power control (APC) system for a spread-spectrum communications system includes an automatic forward power control (AFPC) system, and an automatic reverse power control (ARPC) system. In the AFPC, each subscriber unit (SU) measures a forward signal-to-noise ratio of a respective forward channel information signal to generate a respective forward channel error signal which includes a measure of the uncorrelated noise in the channel and a measure of the error between the respective forward signal-to-noise ratio and a pre-determined signal-to-noise value. A control signal generated from the respective forward channel error signal is transmitted as part of a respective reverse channel information signal. A base unit includes AFPC receivers which receive respective reverse channel information signals and extract the forward channel error signals therefrom to adjust the power levels of the respective forward spread-spectrum signals. In the ARPC system, each base measures a reverse signal-to-noise ratio of each of the respective reverse channel information signals and generates a respective reverse channel error signal which includes a measure of the uncorrelated noise in the channel and a measure of the error between the respective reverse signal-to-noise ratio and a pre-determined signal-to-noise value. The base unit transmits a control signal generated from the respective reverse channel error signal as a part of a respective forward channel information signal. Each SU includes an ARPC receiver which receives the forward channel information signal and extracts the respective reverse error signal to adjust the reverse transmit power level of the respective reverse spread-spectrum signal.

대표청구항 ▼

[ The invention claimed is:] [1.] A system for adaptive power control of a second communication station's transmitter operating in a cellular-communications network using spread-spectrum modulation, the system comprising:a communication station for receiving spread-spectrum signals transmitted from

[ The invention claimed is:] [1.] A system for adaptive power control of a second communication station's transmitter operating in a cellular-communications network using spread-spectrum modulation, the system comprising:a communication station for receiving spread-spectrum signals transmitted from a second communication station through a communication channel;said communication station including:an antenna for receiving spread-spectrum signals;at least one circuit for decoding spread-spectrum signals to receive a specific spread-spectrum signal associated with a unique code transmitted from said second station;means for measuring a signal power of said received specific spread-spectrum signal;means for measuring noise power within said channel;means for measuring an average received total power within said channel;first comparing means for comparing said signal power, said noise power and said average total power;means for generating an error signal based on said first comparison; anda transmitter for transmitting spread-spectrum signals including said error signal to said second station; andsaid second communication station including:an antenna for receiving spread-spectrum signals;at least one detector for detecting said error signal;transmit power adjustment means for adjusting a second station's transmitter power level in response to said error signal; andsaid second station's transmitter for transmitting said specific spread-spectrum signal within said channel to said communication station.