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.
Claims19
A method of communication data signal blocking for a base radio control station (RCS) which conducts wireless communication with subscriber units (SUs) in a spread spectrum communication system using code division multiple access, the method comprising:
- providing a transmitter for transmitting signals over global and assigned channels to SUs which are initialized at initial power levels and adjusted to controlled power levels in advance of transmitting communication data signals on assigned channels, to SUs which power levels combine to define an RSC transmitter power level;
- controlling the power levels of said transmitter signals to adjust the signal power levels in response to corresponding power control signals received from the SUs;
- and
- monitoring the RSC transmitter power level and controlling the transmitter such that transmission of a new communication data signal on an assigned channel is blocked if a predetermined RSC transmitter power level limit is reached before commencing transmission of the new communication data signal.
A base radio control station (RCS) having subscriber unit (SU) blocking control for wireless communication with multiple SUs in a spread spectrum communication system using code division multiple access, the RCS comprising:
- a transmitter for transmitting signals over global and assigned channels to SUs which are initialized at initial power levels and adjusted to controlled power levels in advance of transmitting communication data signals on assigned channels to SUs which power levels combine to define an RSC transmitter power level;
- a receiver and associated circuitry for controlling the power levels of said transmitter signals;
- said receiver and associated circuitry configured to adjust the signal power levels in response to corresponding power control signals received from the SUs;
- and
- control circuitry for monitoring the RSC transmitter power level and controlling the transmitter such that transmission of a new communication data signal on an assigned channel is blocked if a predetermined RSC transmitter power level limit is reached before commencing transmission of the new communication data signal.
Dependencies are inferred from the claim text.