Discussion
What does differential phase shift keying encode?
Answer: B
It encodes the phase change from one symbol to the next, which removes the need for an absolute reference and so sidesteps the ambiguity inherent in phase. The price is a small penalty in noise performance, since two noisy symbols rather than one contribute to each decision. Absolute phase is what plain keying uses. Amplitude and frequency differences belong to other keying families. The trade of a reference against a noise penalty is a recurring pattern in coherent systems.
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