System and method for automatic diagnosis of impairments in a digital quadrature amplitude modulated signal
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United States of America Patent
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Aug 2, 2011
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app pub date -
Nov 22, 2000
filing date -
Nov 22, 2000
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Abstract
A device and methods for automatically diagnosing impairments in a digital quadrature amplitude modulated signal is disclosed. The impairments include phase noise, compression, coherent interference, and non-coherent interference. The device comprises a phase noise detector, a compression detector, and an interference detector. The phase noise detector detects phase noise by analyzing data points of an amplitude quadrature modulated constellation for orthogonal deviations from ideal points. The compression detector detects compression by analyzing the magnitudes of vectors from the constellation's origin to data points of the constellation. The interference detector detects coherent and non-coherent interference by detecting error signals in the data points and then analyzing the distribution of the error signals.
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