LOOPBACK INTERFERENCE CANCELLATION
First Claim
1. A system including:
- an interference estimator configured to;
generate a model for estimating one or more interference signals according to one or more first interference signals due to a first transmit radio (RF) signal output from a transmitter coupled to an input port of a power amplifier, andestimate, according to the model, one or more second interference signals due to a second transmit RF signal output from the transmitter;
a predistortion calibrator coupled to the interference estimator, the predistortion calibrator configured to determine, based on the estimated one or more second interference signals due to the second transmit RF signal, non-linearity of the power amplifier; and
a predistortion generator coupled to the predistortion calibrator, the predistortion generator configured to perform predistortion to compensate for the non-linearity of the power amplifier.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed herein are related to systems and methods for performing predistortion for communication. In one aspect, a coupler coupled to an output port of a power amplifier is disabled during a first time period, while a transmitter coupled to an input port of the power amplifier outputs a first transmit radio frequency (RF) signal. In one aspect, one or more first interference signals due to the first transmit RF signal are determined. In one aspect, the coupler is enabled during a second time period, while the transmitter outputs a second transmit RF signal. In one aspect, one or more second interference signals due to the second transmit RF signal are estimated, according to the determined one or more first interference signals. Based on the estimated one or more second interference signals, non-linearity of the power amplifier can be determined, and predistortion can be performed according to the determined non-linearity.
8 Citations
20 Claims
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1. A system including:
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an interference estimator configured to; generate a model for estimating one or more interference signals according to one or more first interference signals due to a first transmit radio (RF) signal output from a transmitter coupled to an input port of a power amplifier, and estimate, according to the model, one or more second interference signals due to a second transmit RF signal output from the transmitter; a predistortion calibrator coupled to the interference estimator, the predistortion calibrator configured to determine, based on the estimated one or more second interference signals due to the second transmit RF signal, non-linearity of the power amplifier; and a predistortion generator coupled to the predistortion calibrator, the predistortion generator configured to perform predistortion to compensate for the non-linearity of the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An integrated circuit comprising:
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a transmitter coupled to an input port of a power amplifier, the transmitter configured to; transmit a first transmit radio frequency (RF) signal during a first time period, and transmit a second transmit RF signal during a second time period; an interference estimator configured to; determine one or more first interference signals due to the first transmit RF signal, and estimate, according to the determined one or more first interference signals due to the first transmit RF signal, one or more second interference signals due to the second transmit RF signal; a predistortion calibrator coupled to the interference estimator, the predistortion calibrator configured to determine, based on the estimated one or more second interference signals due to the second transmit RF signal, non-linearity of the power amplifier; and a predistortion generator coupled to the predistortion calibrator, the predistortion generator configured to perform predistortion to compensate for the non-linearity of the power amplifier. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A system comprising:
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an antenna; transmission circuitry configured to provide data to the antenna for transmission; and correction circuitry configured to couple an output of the transmission circuitry to at least one input of the transmission circuitry, wherein the correction circuity is configured to; estimate and extract one or more interference signals from the transmission circuitry into the correction circuitry, and correct non-linearity of the transmission circuitry based on the estimation and extraction of the one or more interference signals. - View Dependent Claims (19, 20)
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Specification