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Method and apparatus for mitigating distortion effects in the determination of signal usability

  • US 5,406,588 A
  • Filed: 05/28/1993
  • Issued: 04/11/1995
  • Est. Priority Date: 05/28/1993
  • Status: Expired due to Term
First Claim
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1. In a receiver that receives a stream of information symbols, a method for mitigating distortion effects to enhance signal usability determination, the method comprises the steps of:

  • a) receiving a stream of information symbols to produce a symbol stream, wherein each information symbol of the symbol stream includes a desired component, an interference component, and a distortion component;

    b) determining characteristics of the distortion component to produce distortion characteristics;

    c) determining a representation of the desired component to produce a desired representation;

    d) determining an undesired component based on the desired representation and the symbol stream;

    e) determining a representation of the interference component based on the undesired component and the distortion characteristics; and

    f) determining an indicia of symbol stream usability based on the desired representation and the representation of the interference component,wherein step (e) further comprises;

    e1) determining at least one magnitude value based on the distortion characteristics;

    e2) when magnitude of the undesired component is less than the at least one magnitude value, scaling the undesired component by a first predetermined value; and

    e3) when the magnitude of the undesired component is greater than the at least one magnitude value, scaling the undesired component by a second predetermined value, wherein the second predetermined value is greater than the first predetermined value.

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