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Design and implementation of a DDS‐based multi‐carrier GMSK modulator
Author(s) -
Kesoulis M. J.,
Koukourlis C. S.,
Lygouras J. N.,
Soudris D.,
Sahalos J. N.
Publication year - 2009
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.1014
Subject(s) - minimum shift keying , baseband , computer science , field programmable gate array , gsm , gate array , direct digital synthesizer , embedded system , electronic engineering , computer hardware , telecommunications , frequency synthesizer , quadrature amplitude modulation , phase locked loop , bandwidth (computing) , engineering , bit error rate , channel (broadcasting) , jitter
Abstract The design and hardware implementation of a multi‐carrier Gaussian minimum shift keying (GMSK) modulator, based on a direct digital synthesizer, suitable for global system for mobile (GSM) base station applications is described. The synthesizer does not only generate the baseband GMSK signal, but also delivers it at a low IF. Special care has been taken in order to minimize the required memory of the synthesizer. The hardware implementation is mainly based on a field programmable gate array device (FPGA) and a D/A converter. The number of carriers depends on the size of the FPGA. Finally, the hardware implementation of a two‐carrier modulator is given. Copyright © 2009 John Wiley & Sons, Ltd.