Title :
GMSK modulator for GSM system, an economical implementation on FPGA
Author :
Nitin Babu, K.M. ; Vinaymurthi, K.K.
Author_Institution :
Centre for Dev. of Telematics, Bangalore, India
Abstract :
This paper demonstrates an economical implementation of Gaussian Minimum shift keying (GMSK) modulator for Global System for Mobile communication (GSM) system using the basics of direct waveform synthesis. This method makes use of pre-calculated filter response of Gaussian filter for pulse shaping and Phase concatenation circuit for accumulation. Baseband in-phase and quadrature-phase component generation using quarter Sine or Cosine waveform LUT. (Further these signals are given for up-conversion.) Hardware realization is done using VHDL; circuits are synthesized. Prototyped our design in Altera Cyclone-3 FPGA (Field Programmable Gate Array), verified using R&S (Rhode and Schwarz) Vector signal analyzer. The design and hardware implementation of this modulator was done for indigenous GSM BTS (Base transceiver station) project.
Keywords :
cellular radio; field programmable gate arrays; hardware description languages; minimum shift keying; modulators; network synthesis; pulse shaping circuits; radio transceivers; waveform generators; Altera Cyclone-3 FPGA; GMSK modulator; GSM BTS; Gaussian filter; Gaussian minimum shift keying modulator; VHDL; base transceiver station; baseband in-phase component generation; circuit synthesis; direct waveform synthesis; field programmable gate array; global system for mobile communication; phase concatenation circuit; precalculated filter; pulse shaping circuit; quadrature-phase component generation; vector signal analyzer; Bandwidth; GSM; Optical signal processing; Read only memory; Table lookup; Direct waveform synthesis; GMSK Modulator; Hardware realization and circuit synthesis is done using VHDL; The design Prototyped in Altera Cyclone 3 FPGA;
Conference_Titel :
Communications and Signal Processing (ICCSP), 2011 International Conference on
Conference_Location :
Calicut
Print_ISBN :
978-1-4244-9798-0
DOI :
10.1109/ICCSP.2011.5739302
