CA2363912A1 - Method and apparatus for detecting and quantifying impairments in qam signals - Google Patents

Method and apparatus for detecting and quantifying impairments in qam signals Download PDF

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Publication number
CA2363912A1
CA2363912A1 CA002363912A CA2363912A CA2363912A1 CA 2363912 A1 CA2363912 A1 CA 2363912A1 CA 002363912 A CA002363912 A CA 002363912A CA 2363912 A CA2363912 A CA 2363912A CA 2363912 A1 CA2363912 A1 CA 2363912A1
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Prior art keywords
axis
ideal
detecting
impairments
components
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CA002363912A
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French (fr)
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CA2363912C (en
Inventor
Gerard Terreault
Jean Lewis
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Sunrise Telecom Inc
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Sunrise Telecom Corp
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Publication of CA2363912C publication Critical patent/CA2363912C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/206—Arrangements for detecting or preventing errors in the information received using signal quality detector for modulated signals

Abstract

A method for detecting and quantifying impairments of a received communication signal of a QAM data communication system represented by a plurality of ideal values. The method includes storing a statistically significant number of a plurality of received points of the signal for each ideal value corresponding to a plurality of groups of said plurality of ideal values. The received points are defined by an in-phase and a quadrature components in a coordinate system in which a first axis is the in-phase axis and a second axis is a quadrature axis. The components have corresponding ideal components from their respective ideal value. Each group corresponds to respective impairments and is specific to the same.
CA002363912A 2000-11-29 2001-11-23 Method and apparatus for detecting and quantifying impairments in qam signals Expired - Fee Related CA2363912C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US25372900P 2000-11-29 2000-11-29
US60/253,729 2000-11-29
US09/841,837 2001-04-26
US09/841,837 US7142609B2 (en) 2000-11-29 2001-04-26 Method and apparatus for detecting and quantifying impairments in QAM signals

Publications (2)

Publication Number Publication Date
CA2363912A1 true CA2363912A1 (en) 2002-05-29
CA2363912C CA2363912C (en) 2009-09-22

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CA002363912A Expired - Fee Related CA2363912C (en) 2000-11-29 2001-11-23 Method and apparatus for detecting and quantifying impairments in qam signals

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US (1) US7142609B2 (en)
CA (1) CA2363912C (en)

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Publication number Publication date
US7142609B2 (en) 2006-11-28
US20020064233A1 (en) 2002-05-30
CA2363912C (en) 2009-09-22

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