Generalized Serial MSK Modulation

A generalized form of the serial MSK (GSMSK)modem is presented. The impulse response of the conversion filter required to produce a GSMSK signal whose upward phase trellis arms have an arbitrary curvature is derived. Analysis is presented which shows that the proposed modem does not have intersymbol interference and that the BER performance is that of an antipodal signal set. Numerical results are shown for a particular trellis curvature.