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This discontinuity requires a relatively large percentage of the power to occur outside of the intended
band (e.g., high fractional [[out-of-band]] power), leading to poor [[spectral efficiency]].
Furthermore, CPM is typically implemented as a constant-envelope [[waveform]], i.e. the transmitted carrier power is constant.
Therefore, CPM is attractive because the phase continuity yields high spectral efficiency, and the constant-envelope
yields excellent power efficiency. The primary drawback is the high implementation complexity required for an optimal receiver.
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