Spectral Shaping in Minimum Shift Keying (MSK)-Type Signals
M. Rabzel, S. Pasupathy · IRE Transactions on Communications Systems · 1978
Minimum shift keying (MSK)-type signals, while possessing all the advantages of MSK, allow input data pulse shaping in order to obtain more desirable spectral behavior. This paper presents a set of conditions on the pulse shape which enable an MSK-type signal to have a fast spectral rolloff. AnMth order shaping function, resulting in an asymptotic spectral falloff as| f |^{-(4M + 4)}, is presented. Previously considered schemes such as MSK and sinusoidal frequency shift keying (SFSK) are shown to be special eases of this shaping function.