Adaptive RF amplifier prelimiter
AssigneeInterDigital Technology Corporation
InventorsFatih M. Ozluturk, Brian Kiernan
Life of this patent
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Abstract
The invention reduces transient peaks in signals transmitted in CDMA communication systems. A plurality of spread spectrum data signals are combined into a combined signal having fluctuating power level corresponding to the combination of the data signals. The combined signal is modulated to produce an RF signal for transmission. The average power of the combined signal is measured over a selected time period. The combined signal power level is adaptively limited to a calculated power level based at least in part on the measured power.
Claims18
A transmitter for use in a CDMA communication system station, the transmitter comprising:
- means for combining a plurality of spread spectrum data signals into a combined signal having a fluctuating power level corresponding to the combination of the data signals;
- means for modulating the combined signal to produce an RF signal for transmission;
- means for measuring average power of the combined signal over a selected time period;
- and
- means for adaptively limiting the combined signal power to a calculated power level based at least in part on said measured power.
A method for transmission in a CDMA communication system, the method comprising:
- combining a plurality of spread spectrum data signals into a combined signal having a fluctuating power level corresponding to the combination of the data signals;
- modulating the combined signal to produce an RF signal;
- measuring average power of the combined signal over a selected time period;
- adaptively limited the combined signal power to a calculated power level based at least in part on said measured power;
- and
- transmitting the RF signal.
A transmitter for use in a CDMA communication system station, the transmitter comprising:
- means for combining a plurality of spread spectrum data signals into a combined signal having a fluctuating power level corresponding to the combination of the data signals;
- means for modulating the combined signal to produce an RF signal for transmission;
- means for measuring average power of the combined signal over a selected time period;
- and
- means for adaptively limiting the combined signal power to a calculated power level based at least in part on said measured power;
- and
- an amplifier for amplifying the RF signal prior to transmission and processing means for determining the calculated power level;
- wherein a gain of said amplifier is adjusted by said processing means in response to the calculated power level and stored gain characteristics of said amplifier.
A method for transmission in a CDMA communication system, the method comprising:
- combining a plurality of spread spectrum data signals into a combined signal having a fluctuating power level corresponding to the combination of the data signals;
- modulating the combined signal to produce an RF signal;
- measuring average power of the combined signal over a selected time period;
- adaptively limited the combined signal power to a calculated power level based at least in part on said measured power;
- and
- transmitting the RF signal;
- and
- adjusting the gain factor in response to the calculated power level and stored gain characteristics of the amplifier.
Dependencies are inferred from the claim text.