GMSK modulator

The invention relates to an arrangement for modulation of a digital message according to the GMSK method (Gaussian Minimum Shift Keying) which displays behaviour similar to that of a single-sideband modulator due to appropriate pre-processing (pre-coding). A device of a simple type is to be produced...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	FENSKE HORST, EICHINER GERHARD, RINGELHAAN OTMAR
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	The invention relates to an arrangement for modulation of a digital message according to the GMSK method (Gaussian Minimum Shift Keying) which displays behaviour similar to that of a single-sideband modulator due to appropriate pre-processing (pre-coding). A device of a simple type is to be produced for the generation of a GMSK signal. For this purpose, the invention provides for a selection of the intermediate frequency of the generated single-sideband spectrum (modulator output frequency) such that the condition f(ZF) = ft/4 + n . ft/2 for n >/= 1 is satisfied, in which the system has a clearly defined pulse response. The system is implemented by means of a transversal filter and the entire arrangement in a PROM.