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What it indicates: C/N shows the difference in amplitude between the desired RF carrier and the noise level in a specific part of the spectrum.
Units: Both carrier power (C) and noise power (N) can be measured in watts or volts squared. Decibel-based units like dBm and dBW are also commonly used.
Why it’s important: The C/N measurement helps us determine if a carrier signal is clearly distinguishable from the noise. A low C/N ratio suggests that the signal might be masked by the noise, making it difficult to detect or decode reliably.
Channel quality: C/N is a vital indicator of communication channel quality. A higher C/N typically means a better, cleaner signal.
System quality: The relationship between Bit Error Rate (BER) and C/N is often analyzed using BER vs. C/N plots to evaluate the quality of a communication system.

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