Automatic power control system for a code division multiple access (CDMA) communications system
AssigneeInterDigital Technology Corporation
InventorsGary R. Lomp, Faith M. Ozluturk, John Kowalski
Life of this patent
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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.
Claims24
A code division multiple access (CDMA) subscriber unit comprising:
- circuitry configured to receive at least one power control command on a forward channel, wherein the at least one power control command indicates either an increase or decrease in transmission power level;
- and
- circuitry configured to adjust transmission power levels, of both a first reverse channel including traffic data and a second reverse channel including pilot bits, based on a value of the at least one power control command, wherein the transmission power levels of the first reverse channel and the second reverse channel are different.
A method implemented in a code division multiple access (CDMA) subscriber unit, the method comprising:
- receiving at least one power control command on a forward channel, wherein the at least one power control command indicates either an increase or a decrease in transmission power level;
- and
- adjusting transmission power levels, of both a first reverse channel including traffic data and a second reverse channel including pilot bits, based on a value of the at least one power control command, wherein the transmission power levels of the first reverse channel and the second reverse channel are different.
A code division multiple access (CDMA) subscriber unit comprising:
- an antenna;
- and
- a modem, operatively coupled to the antenna;
- and
- the antenna and the modem are configured to receive at least one power control command on a forward channel, wherein the at least one power control command indicates either an increase or decrease in transmission power level;
- and
- the modem is further configured to adjust transmission power levels, of both a first reverse channel including traffic data and a second reverse channel including pilot bits, based on a value of the at least one power control command wherein the transmission power levels of the first reverse channel and the second reverse channel are different;
- and
- the modem and the antenna are configured to transmit the first reverse channel and the second reverse channel.
Dependencies are inferred from the claim text.