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Digital compensator for a non-linear system

  • US 10,523,159 B2
  • Filed: 05/10/2019
  • Issued: 12/31/2019
  • Est. Priority Date: 05/11/2018
  • Status: Active Grant
First Claim
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1. A method of signal predistortion for linearizing a non-linear circuit, the method comprising:

  • processing an input signal (u) to produce a plurality of transformed signals (w);

    determining a plurality of phase-invariant derived signals (r), each derived signal (rj) of the plurality of derived signals being equal to a respective non-linear function of one or more of the transformed signals, at least some of the derived signals being equal to respective functions of different one or more of the transformed signals;

    transforming each derived signal (rj) of the plurality of phase-invariant derived signals according to a parametric non-linear transformation to produce a time-varying gain component (gi) of a plurality of gain components (g);

    forming a distortion term by accumulating a plurality of terms, each term being a product of a respective transformed signal of the plurality of transformed signals and a respective time-varying gain, the time-varying gain being a function (Φ

    ) of a one or more of the phase-invariant derived signals, the function of the one or more of the phase-invariant derived signals being decomposable into a combination of one or more parametric functions (ϕ

    ) of a corresponding single one of the phase invariant derived signals (rj) yielding a corresponding one of the time-varying gain components (gi); and

    providing an output signal (v) determined from the distortion term for application to the non-linear circuit.

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