Discussion
What does a system's figure of merit compare?
Answer: A
The figure of merit is the ratio of the output signal-to-noise ratio to the signal-to-noise ratio at the channel, so it measures what the demodulation itself contributes. Power ratios describe the link budget. The bandwidth ratio is the bandwidth expansion factor, a related but separate quantity. And noise figure and noise temperature are two forms of the same receiver property. Isolating the demodulator's own contribution is what makes the schemes comparable. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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