Discussion
Coherent detection of a suppressed-carrier double-sideband signal yields a merit value of
Answer: C
It is unity: coherent detection of a suppressed-carrier double-sideband signal delivers exactly the channel signal-to-noise ratio, which is three times better than full-carrier AM at best. A third is the AM figure. Three would imply a gain the scheme does not have. And two is not a standard result here. The improvement over AM comes entirely from not wasting power on a carrier, which is why the two suppressed-carrier schemes share the same figure.
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