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The carrier-to-noise ratio (C/N or CNR) is the ratio of the power of the modulated signal compared to the power of the noise found in the information signal after it has been demodulated. A high CNR means the received signal is of good quality. Carrier-to-noise ratio is measured in the same way as the signal-to-noise ratio, and both measurements reveal the quality of the signal.
Additional Information:
Cisco.com : CNR in Cable Networks
Refer to the RF & Communications Resources page for additional information about RF terminology, fundamentals, and National Instruments RF products.
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