A Simple Signal Shaper for GMSK/GFSK and MSK Modulator Based on Sigma-Delta Look-up Table

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dc.contributor.authorSvedek, Tomislav
dc.contributor.authorHerceg, Marijan
dc.contributor.authorMatic, Tomislav
dc.coverage.issue2cs
dc.coverage.volume18cs
dc.date.accessioned2016-03-17T14:04:30Z
dc.date.available2016-03-17T14:04:30Z
dc.date.issued2009-06cs
dc.description.abstractDue to wide power spectrums of rectangular data streams, it is important for base-band signals to be heavily band limited before modulation. That can be achieved by pulse shaping of rectangular bits. Some of the most common are a half-sine pulse shaper and a Gaussian pulse shaper which are used in Minimum Shift Keying (MSK), Gaussian Minimum Shift Keying (GMSK) and Gaussian Frequency Shift Keying (GFSK) modulations, respectively. The most common solutions of such shapers use PCM based look-up-table (LUT), which requires an nbit D/A converter. We proposed the use of a 1-bit Sigma Delta Modulation (SDM) LUT, which results in smaller ROM capacity, a 1-bit wide output word, and a simple1-bit D/A converter realized as an out-of-chip first-order lowpass RC filter, or an in-chip charge pump. This article describes a simple, but efficient SDM LUT-based half-sine and Gaussian shaper that can be used for generation of MSK and GMSK/GFSK modulated signals. Oscillograms and power spectrums are measured on SDM LUT realized in FLEX AlteraTM PLD, for a 10-bit pseudo-noise sequence test input signal.en
dc.formattextcs
dc.format.extent230-237cs
dc.format.mimetypeapplication/pdfen
dc.identifier.citationRadioengineering. 2009, vol. 18, č. 2, s. 230-237. ISSN 1210-2512cs
dc.identifier.issn1210-2512
dc.identifier.urihttp://hdl.handle.net/11012/57103
dc.language.isoencs
dc.publisherSpolečnost pro radioelektronické inženýrstvícs
dc.relation.ispartofRadioengineeringcs
dc.relation.urihttp://www.radioeng.cz/fulltexts/2009/09_02_230_237.pdfcs
dc.rightsCreative Commons Attribution 3.0 Unported Licenseen
dc.rights.accessopenAccessen
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en
dc.subjectGMSK/GFSKen
dc.subjectMSKen
dc.subjectsigma-deltaen
dc.subjectGaussian filteren
dc.titleA Simple Signal Shaper for GMSK/GFSK and MSK Modulator Based on Sigma-Delta Look-up Tableen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.affiliatedInstitution.facultyFakulta eletrotechniky a komunikačních technologiícs
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