METHOD OF ESTIMATING S/N RATIO OF INPUT CHANNEL, AND TEST AND MEASUREMENT DEVICE

METHOD OF ESTIMATING S/N RATIO OF INPUT CHANNEL, AND TEST AND MEASUREMENT DEVICE

PROBLEM TO BE SOLVED: To estimate an S/N ratio of an input channel carrying a QAM signal.SOLUTION: A Modulation Error Ratio (MER) is calculated for an input QAM signal, but uses only centermost error values of a constellation of the input QAM signal in generating this modified MER. The modified MER...

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Bibliographische Detailangaben
Hauptverfasser: BAKER DANIEL G, LAKSHMANAN GOPISHANKAR, GEORGE W TUSING
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Zusammenfassung:PROBLEM TO BE SOLVED: To estimate an S/N ratio of an input channel carrying a QAM signal.SOLUTION: A Modulation Error Ratio (MER) is calculated for an input QAM signal, but uses only centermost error values of a constellation of the input QAM signal in generating this modified MER. The modified MER accurately represents the S/N ratio of the input channel carrying the QAM signal. In this way, the S/N ratio is accurately determined using only received I and Q components of the modulated QAM input signal itself.