CIRCUITS FOR LINEARIZING AN OUTPUT SIGNAL OF A NON-LINEAR COMPONENT AND RELATED DEVICES AND METHODS

摘要

This disclosure provides a circuit for linearizing an output signal Sout produced by a non-linear component based on an input signal x(n). The circuit comprises a primary pre-distorter module configured to generate a pre-distorted signal y(n) based on the input signal x(n) and a primary pre-distortion function parameterized by a pre-distortion parameter λ and to feed the pre-distorted signal y(n) to the non-linear component. The circuit comprises an estimation module. The estimation module is configured to receive samples z(n) of the output signal Sout, and to determine the pre-distortion parameter λ. The estimation module comprises a secondary pre-distorter module configured to generate a secondary pre-distorter output signal r(n) based on a secondary pre-distortion function and the samples z(n) of the output signal Sout. The secondary pre-distorter module is configured to determine the pre-distortion parameter λ based on a previously determined pre-distortion parameter stored on a data storage, the secondary pre-distorter output signal r(n) and the pre-distorted signal y(n) provided by the primary pre-distorted module. The determining comprises correlating the input signal x(n) with an error signal between the pre-distorted signal y(n) and the secondary pre-distorter output signal r(n).

主权项

1. A circuit for linearizing an output signal Sout produced by a non-linear component based on an input signal (x(n)), the circuit comprising:
a primary pre-distorter module configured to generate a pre-distorted signal (y(n)) based on the input signal (x(n)) and a primary pre-distortion function g( ) parameterized by a pre-distortion parameter (λk-1) and to feed the pre-distorted signal (y(n)) to the non-linear component; and an estimation module configured to receive samples (z(n)) of the output signal Sout, and to determine the pre-distortion parameter (λk); wherein the estimation module comprises a secondary pre-distorter module configured to: generate a secondary pre-distorter output signal (r(n)) based on a secondary pre-distortion function g′( ) and the samples (z(n)) of the output signal Sout, and determine the pre-distortion parameter (λk) based on a previously determined pre-distortion parameter stored on a data storage, the secondary pre-distorter output signal (r(n)) and the pre-distorted signal (y(n)) provided by the primary pre-distorted module, wherein the determining comprises correlating the input signal (x(n)) with an error signal between the pre-distorted signal (y(n)) and the secondary pre-distorter output signal (r(n)).