US Patent 9973370 Memory predistortion in bandwidth limited envelope tracking
Patent 9973370 was granted and assigned to Intel on May, 2018 by the United States Patent and Trademark Office.
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An apparatus compensates nonlinearities in envelope tracking (ET) used in a mobile device by limiting a bandwidth of an envelope signal representing an envelope of an input baseband signal to be less than a bandwidth of tracker circuitry, generating a scaled replica of an output signal of the tracker circuitry based on the bandwidth-limited envelope signal, and generating a model distortion signal based on the scaled replica and the input baseband signal, where the model distortion signal emulates ET linearity degradation. The apparatus is further configured to generate an output baseband signal based on the scaled replica, the model distortion signal, and the input baseband signal, where the output baseband signal is pre-distorted relative to the input baseband signal according to the scaled replica, the model distortion signal, and the input baseband signal to compensate for degradations in transmit signal quality due to ET nonlinearities.
US Patent 09973370 Memory predistortion in bandwidth limited envelope tracking US Patent 9973370 Memory predistortion in bandwidth limited envelope tracking
US Patent 09973370 Memory predistortion in bandwidth limited envelope tracking
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