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A simple signal shaper for GMSK/GFSK and MSK modulator based on sigma-delta look-up table (CROSBI ID 150518)

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Švedek, Tomislav ; Herceg, Marijan ; Matić, Tomislav A simple signal shaper for GMSK/GFSK and MSK modulator based on sigma-delta look-up table // Radioengineering, 18 (2009), 2; 230-237

Podaci o odgovornosti

Švedek, Tomislav ; Herceg, Marijan ; Matić, Tomislav

engleski

A simple signal shaper for GMSK/GFSK and MSK modulator based on sigma-delta look-up table

Due 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 n-bit 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 low-pass 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.

GMSK/GFSK; MSK; sigma-delta; Gaussian filter

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Podaci o izdanju

18 (2)

2009.

230-237

objavljeno

1210-2512

Povezanost rada

Elektrotehnika, Računarstvo

Poveznice
Indeksiranost