Design and implementation of a DDS-based multi-carrier GMSK modulator

M. J. Kesoulis, C. S. Koukourlis, J. N. Lygouras, D. Soudris, J. N. Sahalos

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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.

Original languageEnglish
Pages (from-to)971-987
Number of pages17
JournalInternational Journal of Communication Systems
Issue number8
Publication statusPublished - Aug 2009


  • Direct Digital Synthesis (DDS)
  • Gaussian filter
  • GMSK modulation
  • GSM

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    Kesoulis, M. J., Koukourlis, C. S., Lygouras, J. N., Soudris, D., & Sahalos, J. N. (2009). Design and implementation of a DDS-based multi-carrier GMSK modulator. International Journal of Communication Systems, 22(8), 971-987.