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Pregled bibliografske jedinice broj: 210793

Zbornik radova

Autori: Herceg, Marijan; Švedek, Tomislav; Matić, Tomislav
Naslov: Sigma-delta look-up table based Gaussian shaper
Izvornik: Microelectronics, Electronics and Electronic Technologies + Hypermedia and Grid Systems MIPRO 2005 / Biljanović, Petar ; Skala, Karolj (ur.). - Rijeka : Studio Hofbauer , 2005. 149-152.
Skup: MIPRO 2005
Mjesto i datum: Opatija, Hrvatska, 30.05.-03.06.2005.
Ključne riječi: Gaussian filter; Minimum Shift Keying; look-up table
Sažetak:
Gaussian filters are commonly used for pulse shaping of rectangular data signals. Modulation of a high-frequency carrier by such shaped signals gives the Gaussian Minimum Shift Modulation (GMSK) scheme. As a result of the pulse shaping, GMSK has a narrower power spectrum than MSK signal, and especially narrower than base-band data signal. There are many different approaches for realization of Gaussian filter ; from analog multistage RC- or SC-filters, to different digital filters. Of particular interest are solutions with look-up-table (LUT). LUT saves the basic elements of already Gaussian-shaped signal elements, and is basically realized by PCM sampling of Gaussian-shaped signal. PCM based LUTs are hardware consuming and at output they need n-bit D/A converter. Our proposition is the use of 1-bit Sigma Delta Modulation (SDM) for sampling of a Gaussian-shaped signal. The results are smaller ROM capacity, 1-bit wide output word, and 1-bit D/A converter realized as a simple first order low-pass RC filter. This article describes simple, but efficient SDM LUT-based Gaussian shaper that can be used for generation of GMSK and GFSK modulated signals. Measured oscillograms and power spectrums are obtained for 10-bit pseudo-noise sequence input signal for SDM LUT based Gaussian shaper realized in FLEX AlteraTM PLD.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Cjeloviti rad (više od 1500 riječi)
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 0165112
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Elektrotehnika



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