Signal correction techniques
First Claim
Patent Images
1. A method for updating a first look-up table (LUT) used by distortion counteracting equipment to counteract distortion in signal handling equipment, the method comprising:
- generating an error signal between (1) an output signal generated by the signal handling equipment based on an input signal having an amplitude and (2) a desired output signal for the signal handling equipment;
generating a ratio by dividing the error signal by the amplitude of the input signal; and
updating the first LUT based on the ratio of the error signal to the amplitude of the input signal.
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Abstract
Errors present in the output of an amplifier (10) are compared with the amplifier input in a control unit (24) to derive corrected coefficients for a look-up table used by predistorter (12) to eliminate distortion in the output of the amplifier (10). Depending on the format of the predistorter (12), at least some of the coefficients are corrected using measured errors that have been rendered independent of the input signal'"'"'s amplitude.
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Citations
33 Claims
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1. A method for updating a first look-up table (LUT) used by distortion counteracting equipment to counteract distortion in signal handling equipment, the method comprising:
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generating an error signal between (1) an output signal generated by the signal handling equipment based on an input signal having an amplitude and (2) a desired output signal for the signal handling equipment; generating a ratio by dividing the error signal by the amplitude of the input signal; and updating the first LUT based on the ratio of the error signal to the amplitude of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Distortion counteracting equipment for linearizing signal handling equipment using a first LUT to counteract distortion in the signal handling equipment, the distortion counteracting equipment adapted to:
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generate an error signal between (1) an output signal generated by the signal handling equipment based on an input signal having an amplitude and (2) a desired output signal for the signal handling equipment; generate a ratio by dividing the error signal by the amplitude of the input signal; and update the first LUT based on the ratio of the error signal to the amplitude of the input signal. - View Dependent Claims (18)
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19. A system comprising:
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signal handling equipment adapted to generate an output signal based on an input signal having an amplitude; and distortion counteracting equipment adapted to linearize the signal handling equipment using a first LUT to counteract distortion in the signal handling equipment, the distortion counteracting equipment adapted to; generate an error signal between (1) the output signal generated by the signal handling equipment and (2) a desired output signal for the signal handling equipment; generate a ratio by dividing the error signal by the amplitude of the input signal; and update the first LUT based on the ratio of the error signal to the amplitude of the input signal. - View Dependent Claims (20)
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21. A method for updating a first look-up table (LUT) used by distortion counteracting equipment to counteract distortion in signal handling equipment, the method comprising:
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generating an error signal between (1) an output signal generated by the signal handling equipment based on an input signal having an amplitude and (2) a desired output signal for the signal handling equipment; and updating the first LUT based on a ratio of the error signal to the amplitude of the input signal, wherein; the distortion counteracting equipment uses the first LUT to counteract amplitude distortion in the signal handling equipment; the first LUT is updated based on a ratio of amplitude of the error signal to the amplitude of the input signal; the distortion counteracting equipment uses a second LUT to counteract phase distortion in the signal handling equipment; and the second LUT is updated based on phase of the error signal independent of the amplitude of the input signal.
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22. A method for updating a first look-up table (LUT) used by distortion counteracting equipment to counteract distortion in signal handling equipment, the method comprising:
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generating an error signal between (1) an output signal generated by the signal handling equipment based on an input signal having an amplitude and (2) a desired output signal for the signal handling equipment; and updating the first LUT based on a ratio of the error signal to the amplitude of the input signal, wherein; the distortion counteracting equipment uses the first LUT to counteract in-phase distortion in the signal handling equipment; and the first LUT is updated based on a ratio of an in-phase component of the error signal to the amplitude of the input signal. - View Dependent Claims (23)
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24. A method for updating a first look-up table (LUT) used by distortion counteracting equipment to counteract distortion in signal handling equipment, the method comprising:
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generating an error signal between (1) an output signal generated by the signal handling equipment based on an input signal having an amplitude and (2) a desired output signal for the signal handling equipment; and updating the first LUT based on a ratio of the error signal to the amplitude of the input signal, wherein; the distortion counteracting equipment uses the first LUT to counteract quadrature distortion in the signal handling equipment; and the first LUT is updated based on a ratio of a quadrature component of the error signal to the amplitude of the input signal.
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25. A method for updating a first look-up table (LUT) used by distortion counteracting equipment to counteract distortion in signal handling equipment, the method comprising:
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generating an error signal between (1) an output signal generated by the signal handling equipment based on an input signal having an amplitude and (2) a desired output signal for the signal handling equipment; and updating the first LUT based on a ratio of the error signal to the amplitude of the input signal, wherein; a plurality of error signals are generated over time; a plurality of average error signals are generated for different amplitudes of the input signal; and the first LUT is updated based on a plurality of ratios, each ratio being a ratio of one of the plurality of average error signals to the corresponding amplitude of the input signal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33)
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Specification