Systems, methods and computer program products for averaging learned levels in the presence of digital impairments based on patterns
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United States of America Patent
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Jun 22, 2004
Grant Date -
N/A
app pub date -
Oct 29, 1999
filing date -
Oct 29, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods, systems and computer program products for averaging measured levels from differing frame intervals based on a digital impairment pattern associated with the frame intervals are provided. Measured levels from frame intervals with the same digital impairment pattern may be averaged together and the measured levels replaced with the average. By averaging frame intervals based on a digital impairment pattern, the present invention may reduce the impact of noise by increasing the signal to noise ratio of the levels utilized for constellation generation. The use of the digital impairment patterns for determining which frame intervals to average may reduce the likelihood that digital impairments will corrupt the average by, for example, collapsing measured levels from one code point onto another code point. If the frame intervals have the same digital impairment pattern then it is likely that the differences in the values of the in the measured levels of the frame intervals are the result of random noise rather than digital impairments and, therefore, may be averaged together to reduce the impact of the random noise.
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