Apparatus and method for reduced computation amplifier gain control
First Claim
Patent Images
1. A method for controlling a transmitter amplifier, comprising:
- receiving a frequency band that includes an assigned channel, an adjacent frequency channel, and a communication signal from the transmitter amplifier in the assigned channel, the assigned channel and the adjacent channel being respective sub-bands of the frequency band;
estimating a distortion by the transmitter amplifier, wherein estimating the distortion includes estimating an adjacent frequency interference, the adjacent frequency interference including amplifier distortion components of the communication signal extending into the adjacent frequency channel, wherein estimating the adjacent frequency interference includes;
determining cross-correlation coefficients, between the communication signal and the adjacent frequency channel, andestimating the adjacent channel interference, based at least in part on the cross-correlation coefficients; and
upon the estimated distortion by the transmitter amplifier, as indicated by the estimated adjacent channel interference, meeting a given condition, initiating communication of an operating point notice, toward a local control of the transmitter amplifier.
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Abstract
Signals are received that include a channel band and an adjacent band. The channel band is demodulated to obtain recovered symbols. Cross-correlation between the recovered symbols and the adjacent band is estimated. Adjacent channel interference is estimated, using the estimated cross-correlation of the recovered symbols and the adjacent band. Upon the estimated adjacent channel interference meeting a condition, a back-off command is sent to a transmitter power amplifier.
30 Citations
22 Claims
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1. A method for controlling a transmitter amplifier, comprising:
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receiving a frequency band that includes an assigned channel, an adjacent frequency channel, and a communication signal from the transmitter amplifier in the assigned channel, the assigned channel and the adjacent channel being respective sub-bands of the frequency band; estimating a distortion by the transmitter amplifier, wherein estimating the distortion includes estimating an adjacent frequency interference, the adjacent frequency interference including amplifier distortion components of the communication signal extending into the adjacent frequency channel, wherein estimating the adjacent frequency interference includes; determining cross-correlation coefficients, between the communication signal and the adjacent frequency channel, and estimating the adjacent channel interference, based at least in part on the cross-correlation coefficients; and upon the estimated distortion by the transmitter amplifier, as indicated by the estimated adjacent channel interference, meeting a given condition, initiating communication of an operating point notice, toward a local control of the transmitter amplifier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a transmitter amplifier, comprising:
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receiving a frequency band that includes an assigned channel, an adjacent channel, and a communication signal from the transmitter amplifier in the assigned channel, the assigned channel and the adjacent channel being respective sub-bands of the frequency band; determining cross-correlation coefficients, between the communication signal and the adjacent channel, wherein; determining cross-correlation coefficients includes demodulating the communication signal to obtain a recovered symbol, and the cross-correlation coefficients are each associated with a different time offset from the recovered symbol; estimating an adjacent channel interference based at least in part on the cross-correlation coefficients; and upon the estimated adjacent channel interference meeting a given condition, initiating communication of an operating point notice, toward a local control of the transmitter amplifier, wherein; demodulating the communication signal is configured to form a series of recovered symbols, a reference time is a periodic reference time that aligns with the recovered symbols, and the cross-correlation coefficients are each associated with a different time offset between the reference time and the adjacent channel. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A receiver circuit for controlling a transmitter amplifier back-off, comprising:
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a receiver antenna; a filter coupled to the receiver antenna and configured to pass an assigned frequency channel and an adjacent frequency channel, the assigned frequency channel and the adjacent frequency channel being respective sub-bands of the frequency band, a communication signal from the transmitter amplifier being in the assigned channel; a logic that includes a cross-correlation coefficient logic and an adjacent channel interference estimation logic, configured to estimate a distortion by the transmitter amplifier, the distortion including components of the communication signal extending into the adjacent frequency channel, wherein; the cross-correlation coefficient logic is configured to generate a set of cross-correlation coefficients, between the assigned channel and the adjacent channel, and the adjacent channel interference estimation logic is configured to estimate the adjacent channel interference based at least in part on the set of cross-correlation coefficients, the estimated adjacent channel interference being the estimate of the distortion; and an operating point notice logic, configured to generate an operating point notice in response to the estimated distortion by the transmitter amplifier, as indicated by the estimated adjacent channel interference meeting a given condition. - View Dependent Claims (19, 20, 21, 22)
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Specification