Performing remote power amplifier linearization
First Claim
1. A method for estimating non-linearity of a power amplifier, comprising:
- receiving a plurality of signals at a first location, the plurality of signals comprising an input signal, a pre-distorted signal, and an output signal, the input signal being pre-distorted to yield the pre-distorted signal, the pre-distorted signal being amplified by a power amplifier to yield the output signal, the output signal exhibiting distortion with respect to the input signal, the distortion comprising a non-linearity effect, the power amplifier located at a second location remote from the first location;
estimating non-linearity of the power amplifier in accordance with the signals at the first location using an inverse model;
calculating pre-distortion information according to the estimated non-linearity using the inverse model; and
sending the pre-distortion information to a pre-distorter at the second location, the pre-distorter operable to reduce the non-linearity effect using the pre-distortion information.
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Accused Products
Abstract
Estimating non-linearity of a power amplifier includes receiving signals at a first location. The signals include an input signal, a pre-distorted signal, and an output signal. The output signal exhibits distortion, including a non-linearity effect, with respect to the input signal. The power amplifier is located at a second location remote from the first location. The non-linearity of the power amplifier is estimated in accordance with the signals at the first location using an inverse model. Pre-distortion information is calculated according to the estimated non-linearity using the inverse model. The pre-distortion information is sent to a pre-distorter at the second location, where the pre-distorter can reduce the non-linearity effect using the pre-distortion information.
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Citations
20 Claims
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1. A method for estimating non-linearity of a power amplifier, comprising:
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receiving a plurality of signals at a first location, the plurality of signals comprising an input signal, a pre-distorted signal, and an output signal, the input signal being pre-distorted to yield the pre-distorted signal, the pre-distorted signal being amplified by a power amplifier to yield the output signal, the output signal exhibiting distortion with respect to the input signal, the distortion comprising a non-linearity effect, the power amplifier located at a second location remote from the first location;
estimating non-linearity of the power amplifier in accordance with the signals at the first location using an inverse model;
calculating pre-distortion information according to the estimated non-linearity using the inverse model; and
sending the pre-distortion information to a pre-distorter at the second location, the pre-distorter operable to reduce the non-linearity effect using the pre-distortion information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for estimating non-linearity of a power amplifier, comprising:
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an inverse model module at a first location operable to;
receive a plurality of signals, the plurality of signals comprising an input signal, a pre-distorted signal, and an output signal, the input signal being pre-distorted to yield the pre-distorted signal, the pre-distorted signal being amplified by a power amplifier to yield the output signal, the output signal exhibiting distortion with respect to the input signal, the distortion comprising a non-linearity effect, the power amplifier located at a second location remote from the first location;
estimate non-linearity of the power amplifier in accordance with the signals; and
calculate pre-distortion information according to the estimated non-linearity; and
a transmitter coupled to the inverse model module and operable to send the pre-distortion information to a pre-distorter at the second location, the pre-distorter operable to reduce the non-linearity effect using the pre-distortion information. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for estimating non-linearity of a power amplifier, comprising:
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means for receiving a plurality of signals at a first location, the plurality of signals comprising an input signal, a pre-distorted signal, and an output signal, the input signal being pre-distorted to yield the pre-distorted signal, the pre-distorted signal being amplified by a power amplifier to yield the output signal, the output signal exhibiting distortion with respect to the input signal, the distortion comprising a non-linearity effect, the power amplifier located at a second location remote from the first location;
means for estimating non-linearity of the power amplifier in accordance with the signals at the first location using an inverse model;
means for calculating pre-distortion information according to the estimated non-linearity using the inverse model; and
means for sending the pre-distortion information to a pre-distorter at the second location, the pre-distorter operable to reduce the non-linearity effect using the pre-distortion information.
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20. A method for estimating non-linearity of a power amplifier, comprising:
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receiving a plurality of signals at a first location, the plurality of signals comprising an input signal, a pre-distorted signal, and an output signal, the input signal being pre-distorted to yield the pre-distorted signal, the pre-distorted signal being amplified by a power amplifier to yield the output signal, the output signal exhibiting distortion with respect to the input signal, the distortion comprising a non-linearity effect, the power amplifier located at a second location remote from the first location, the first location being more than one hundred miles from the second location;
reducing an impairment effect of the distortion by;
isolating the impairment effect of the distortion using an inverse model at the first location; and
calculating compensation information according to the isolated impairment effect; and
sending the compensation information to an impairment compensator at the second location, the impairment compensator operable to reduce the impairment effect using the compensation information;
estimating at the second location non-linearity of the power amplifier in accordance with the signals at the first location using the inverse model, the non-linearity estimated by;
estimating a memory depth of the power amplifier at the first location using a forward model located at the second location to generate memory information; and
estimating the non-linearity of the power amplifier in accordance with the memory information by;
establishing an output signal polynomial corresponding to the output signal;
establishing a polynomial order of the output signal polynomial to fit the distortion; and
determining a number of delay taps to be implemented at the pre-distorter using the output signal polynomial with the established polynomial order by;
establishing an output signal polynomial corresponding to the output signal, the output signal polynomial comprising a plurality of coefficients;
varying a number of delay taps of the power amplifier;
monitoring the plurality of coefficients in response to the variation with respect to a memory threshold;
determining that the plurality of coefficients fall below the memory threshold with a certain number of delay taps; and
identifying the certain number of delay taps as a number of delay taps for modeling the power amplifier;
calculating pre-distortion information according to the estimated non-linearity using the inverse model; and
sending the pre-distortion information to a pre-distorter at the second location, the pre-distorter operable to reduce the non-linearity effect using the pre-distortion information;
calculating a performance characteristic from the signals, the performance characteristic describing performance of the power amplifier; and
displaying a graphical representation of the performance characteristic using a system monitor at the first location.
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Specification