Discussion
A pilot carrier is transmitted with a suppressed-carrier signal in order to
Answer: A
A small pilot, typically twenty decibels below full carrier, gives the receiver something to lock its local oscillator to while costing little power. It is the compromise between full-carrier simplicity and suppressed-carrier efficiency. It adds power but that is a cost rather than the purpose. Bandwidth is unchanged. And it is far too small to support envelope detection, which needs a carrier larger than the sidebands. That is the trade the suppressed-carrier family exists to make explicit.
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