Generation of serial CPMFSK signal

A "serial" or "one channel" approach to the design of an M-ary CPFSK (CPMFSK) generator of arbitrary modulation index has been described. Uniformly spaced quadrant samples of the signaling sinusoids are stored in a ROM, appropriately retrieved by means of a simple digital processor and finally passed through a digital-to-analog converter (DAC) followed by a discretely tracking low-pass filter (LPF) to generate the CPMFSK signal. The design and implementation procedure of the proposed generator has been presented.