DIGITAL PREDISTORTION FOR DUAL-BAND POWER AMPLIFIERS
First Claim
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1. A signal processing circuit arrangement comprising:
- a preamplifier circuit configured to;
map a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals;
extrapolate from the first subset of the plurality of lookup table coefficients to generate a lookup table output; and
apply the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier.
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Abstract
A signal processing circuit arrangement may include a preamplifier circuit configured to map a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals, extrapolate from the first subset of the plurality of lookup table coefficients to generate a lookup table output, and apply the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier.
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Citations
24 Claims
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1. A signal processing circuit arrangement comprising:
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a preamplifier circuit configured to; map a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals; extrapolate from the first subset of the plurality of lookup table coefficients to generate a lookup table output; and apply the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A signal processing circuit arrangement comprising:
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a first DPD circuit configured to; to map a first dimension input and a second dimension input to one or more first two-dimensional (2D) lookup tables, wherein the first dimension input represents a signal level of a first input signal and the second dimension input represents a signal level of a second input signal, and to extrapolate from lookup table coefficients of a first 2D lookup table of the one or more first 2D lookup tables to obtain a first intermediate signal; a second DPD circuit configured to; map the first dimension input and the second dimension input to one or more second 2D lookup tables, and to interpolate or extrapolate with lookup table coefficients of the one or more second 2D lookup tables to obtain a second intermediate signal; and a combination circuit configured to combine the first intermediate signal and the second intermediate signal to obtain a predistorted input signal for an amplifier. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method of preprocessing amplifier input signals, the method comprising:
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mapping a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals; extrapolating from the first subset of the plurality of lookup table coefficients to generate a lookup table output; and applying the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier. - View Dependent Claims (23, 24)
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Specification