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Multi-band digital compensator for a non-linear system

  • US 10,644,657 B1
  • Filed: 10/18/2019
  • Issued: 05/05/2020
  • 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) comprising a plurality of separate band signals (u1, . . . , uNb), each separate band signal having a separate frequency range within the input frequency range of the input signal, at least part of the input frequency range containing none of the separate frequency range, the processing producing a plurality of transformed signals (w), the transformed signals including at least one transformed signal equal to a combination of multiple separate band signals;

    determining a plurality of phase-invariant derived signals (r) to be equal to respective non-linear functions of one or more of the transformed signals;

    transforming the plurality of phase-invariant derived signals (r) according to a plurality of parametric non-linear transformations (Φ

    ) to produce a plurality of gain components (g);

    forming a distortion term by accumulating a plurality of terms (k), each term being a combination of a transformed signal (wak) of the plurality of transformed signals and respective one or more time-varying gain components (gi,i∈

    Λ

    k) of the plurality of gain components; and

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

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