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Continuous phase modulation
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== Partial response CPM == Partial-response signaling, such as [[duo-binary signaling]], is a form of intentional ISI where a certain number of adjacent symbols interfere with each symbol in a controlled manner. A MLSE must be used to optimally demodulate any signal in the presence of ISI. Whenever the amount of ISI is known, such as with any partial-response signaling scheme, MLSE can be used to determine the exact symbol sequence (in the absence of noise). Since the optimal demodulation of full-response CPM already requires MLSE detection, using partial-response signaling requires little additional complexity, but can afford a comparatively smoother phase trajectory, and thus, even greater spectral efficiency. One extremely popular form of partial-response CPM is [[GMSK]], which is used by [[GSM]] in most of the world's 2nd generation cell phones. It is also used in [[802.11]] FHSS, [[Bluetooth]], and many other proprietary wireless modems.
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