Modulation analysis and distortion identification
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United States of America Patent
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Apr 8, 2014
Grant Date -
Aug 11, 2011
app pub date -
Aug 2, 2010
filing date -
Feb 5, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus, method, computer readable medium, and system are provided to generate a symbol placement associated with a transmission scheme by transforming a retrieved set of equalization coefficients. Symbols included in the symbol placement may be analyzed and quantified in terms of their distance from a decision boundary. Symbols may be synthesized on an iterative basis in order to obtain visibility into the underlying performance of the transmission scheme over time. If equalization is unable to reduce a signal impairment below a threshold value within a predetermined amount of time, then a determination may be made that a non-linear distortion source is present in a network or communication system. Signals received from a plurality of user terminals may be compared with one another in order to determine a probable location or cause of the non-linear distortion.
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