CPFSKContinuous Phase Frequency Shift Keying
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Therefore, this interpretation is for serial generation of MSK as CPM and is equivalent to the serial interpretation using CPFSK, which can be written as
One effective and simple method of realizing full 360 [degrees] linear phase control is using a microwave frequency multiplier on the output of a highly linear fractional-range phase shifter.[6,7] If the baseband binary signal is integrated prior to phase modulation, the resulting modulated signal is CPFSK. The functional block diagram for this method is shown in Figure 1.
Both VHF (116 to 150 MHz) and UHF (225 to 400 MHz) operation are provided; modulation includes AM, FM and CPFSK. The system also can be configured for manpack applications.