Automatic power control system for a code division multiple access (CDMA) communications system
AssigneeInterDigital Technology Corporation
InventorsGary Lomp, Fatih Ozluturk, John Kowalski
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Abstract
A receiver receives signals and noise over a frequency spectrum of a desired received signal. The desired received signal is spread using code division multiple access. The received signals and noise are demodulated to produce a demodulated signal. The demodulated signal is despread using a code uncorrelated with a code associated with the desired received signal. A power level of the despread demodulated signal is measured as an estimate of the noise level of the frequency spectrum.
Claims12
A method of self blocking for a subscriber unit (SU) which conducts wireless communication with a base station in a spread spectrum communication system using code division multiple access, the method comprising:
- providing a SU transmitter for transmitting signals over global and assigned channels to a base station which are initialized at a initial power level and adjusted to a controlled power level in advance of transmitting a communication data signal on an assigned channel to the base station;
- controlling the power level of said SU transmitter to adjust the SU transmitter power level in response to power control signals received from the base station;
- and
- monitoring the SU transmitter power level in advance of transmitting a communication data signal on an assigned channel to the base station and controlling the transmitter such that transmission of a communication data signal on an assigned channel is blocked if a predetermined power limit is reached before commencing transmission of the communication data signal on the assigned channel.
A subscriber unit (SU) having self blocking control for wireless communication with a base station in a spread spectrum communication system using code division multiple access, the SU comprising:
- a transmitter for transmitting signals over global and assigned channels to a base station which are initialized at a initial power level and adjusted to a controlled power level in advance of transmitting a communication data signal on an assigned channel to the base station;
- a receiver and associated circuitry for controlling the power level of said transmitter;
- said receiver and associated circuitry configured to adjust the SU transmitter power level in response to power control signals received from the base station;
- and
- control circuitry for monitoring the SU transmitter power level in advance of transmitting a communication data signal on an assigned channel to the base station and controlling the transmitter such that transmission of a communication data signal on an assigned channel is blocked if a predetermined power limit is reached before commencing transmission of the communication data signal on the assigned channel.
Dependencies are inferred from the claim text.