Napredna pretraga

Pregled bibliografske jedinice broj: 209868

Sigma-delta look-up table based half-sine pulse shaper


Matić, Tomislav; Herceg, Marijan; Švedek, Tomislav
Sigma-delta look-up table based half-sine pulse shaper // IEEE 9th International Conference on Intelligent Engineering Systems INES 2005 / Rudas, Imre ; Tar, Jozsef ; Szakal, Aniko (ur.).
Budapest: IEEE, 2005. str. 259-262 (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)


Naslov
Sigma-delta look-up table based half-sine pulse shaper

Autori
Matić, Tomislav ; Herceg, Marijan ; Švedek, Tomislav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
IEEE 9th International Conference on Intelligent Engineering Systems INES 2005 / Rudas, Imre ; Tar, Jozsef ; Szakal, Aniko - Budapest : IEEE, 2005, 259-262

Skup
IEEE 9th International Conference on Intelligent Engineering Systems INES 2005

Mjesto i datum
Cruising on Mediterranean Sea, 16-19. 09. 2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Pulse shaping; sigma-delta; minimum shift keying; look-up table

Sažetak
Due to the 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. The most common is half-sine shaping, which is used in Minimum Shift Keying (MSK) modulation. MSK modulator can be realized by direct injection of NRZ data into the frequency modulator using the modulation index of 0.5, or by replacement of the rectangular pulse-shapes with half-cycle sinusoidal pulses (half-sine) before modulation with I-Q modulator. The modulation of a high-frequency carrier by such shaped signals results with narrower power spectrum than rectangular shape. The most common solutions use PCM based look-up-table (LUT), which requires n-bit D/A converter. Our proposition is use of 1-bit Sigma Delta Modulation (SDM) LUT, which results with smaller ROM capacity, 1-bit wide output word, and 1-bit D/A converter realized as a simple first order low-pass RC filter [1]. Measured oscillograms and power spectrums are obtained for 10-bit pseudo-random sequence input signal for SDM LUT based half-sine shaper realized in FLEX AlteraTM PLD.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika



POVEZANOST RADA


Projekt / tema
0165112

Ustanove
Fakultet elektrotehnike, računarstva i informacijskih tehnologija Osijek