Discussion
Why does DSB-SC exist at all, given that SSB is better on both counts?
Answer: A
DSB-SC needs only a balanced modulator and a coherent detector, with no sharp filter or wideband quadrature network, so it is markedly simpler to build than SSB. That is why it appears wherever bandwidth is not the binding constraint, as in the television colour subcarrier. It still needs linear amplification and still needs carrier recovery. And its noise performance per watt is comparable rather than better, with the penalty of twice the receiver bandwidth.
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