A generalization of MSKtype signaling based upon input data symbol pulse shaping
Abstract
Minimumshiftkeying (MSK), which is a special case of continuous phase frequencyshiftkeying (CPFSK) with frequency deviation ratio equal to 0.5, is known to be spectrally equivalent to a form of offset quadrature phaseshiftkeying (OQPSK) in which the symbol pulse shape is a halfcycle sinusoid rather than the usual rectangular form. Appropriate shaping of the input data symbols allows one to generate an entire class of constant envelope, MSKtype signals, whose spectral properties are in some applications more desirable than those of MSK or OQPSK. The present study derives and presents a set of conditions on the input pulse shaping which in turn describes the class of envelope shapes allowable. The autocorrelation function and power spectral density of this class of signals are then derived, and specific examples are given to illustrate the desirable spectral properties. Such properties are important considerations in system design where interchannel and intersymbol interference degradations must be kept to a minimum.
 Publication:

In: International Conference on Communications
 Pub Date:
 1976
 Bibcode:
 1976icc.....3...44S
 Keywords:

 Data Transmission;
 Intersymbolic Interference;
 Phase Shift Keying;
 Signal Encoding;
 Transmission Efficiency;
 Waveforms;
 Autocorrelation;
 Noise Reduction;
 Power Spectra;
 Quadratures;
 Symbols;
 Systems Engineering;
 Communications and Radar