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US 9,432,228 B2Granted
Digital pre-distortion filter system and method
AssigneeIntel Corporation
InventorsMajid Pashay-Kojouri, Richard Maiden
Life of this patent
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Abstract
A digital predistorter for improving the performance of a narrow passband filter near the output is disclosed. The digital predistorter provides amplitude correction to the signal based on the characteristics of the passband filter. A filter group delay predistorter may also be employed to correct group delay variation introduced by the narrow passband filter.
Claims22
An apparatus of a device for wireless communication, the apparatus comprising:
- predistortion circuitry to pre-distort digital baseband samples for a plurality of component carriers and generate a predistorted baseband signal for each component carrier, the predistortion circuitry to perform amplitude correction based on a roll-off characteristic associated with the component carriers;
- combiner circuitry to generate a digital multicarrier signal from the predistorted baseband signals;
- group-delay (GD) predistortion circuitry to provide an inverse group delay characteristic to the multicarrier signal;
- crest-factor reduction (CFR) circuitry to reduce a crest factor of the multicarrier signal after operation of the GD predistortion circuitry;
- and
- transceiver circuitry to generate an orthogonal frequency division multiplexed (OFDM) signal, from the multicarrier signal, for each component carrier, for transmission, after CFR.
3 more elements
A method, performed by processing circuitry and transceiver circuitry, the method comprising:
- pre-distorting digital baseband samples for a plurality of component carriers to generate a predistorted baseband signal for each component carrier, the pre-distorting comprising an amplitude correction based on a roll-off characteristic associated with the component carriers;
- generating a digital multicarrier signal from the predistorted baseband signals;
- imposing an inverse group delay (GD) characteristic to the multicarrier signal;
- reducing a crest factor of the multicarrier signal after imposing the inverse GD;
- and
- generating an orthogonal frequency division multiplexed (OFDM) signal, from the multicarrier signal, for each component carrier, for transmission, after reducing the crest factor.
3 more elements
An apparatus of a wireless communication device, the apparatus comprising:
- predistortion circuitry to pre-distort digital baseband samples for each of a plurality of component carriers and generate a predistorted baseband signal for each component carrier, the predistortion circuitry to perform amplitude correction based on a roll-off characteristic associated with each component carrier;
- combiner circuitry to generate a digital multi carrier signal from the predistorted baseband signals;
- group-delay (GD) predistortion circuitry to provide an inverse group delay characteristic to the multicarrier signal;
- crest-factor reduction (CFR) circuitry to reduce a crest factor of the multicarrier signal after operation of the GD predistortion circuitry;
- and
- transceiver circuitry, including an output band-pass filter, to generate an orthogonal frequency division multiplexed (OFDM) signal, from the multicarrier signal, for each component carrier, for transmission, after CFR.
3 more elements
Dependencies are inferred from the claim text.