Design and Development of Gaussian Minimum Shift Keying (GMSK) Demodulator for Satellite Communication | Zendy

Pradeep Kumar Govindaiah | Zendy

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Design and Development of Gaussian Minimum Shift Keying (GMSK) Demodulator for Satellite Communication

Author(s) -

Pradeep Kumar Govindaiah

Publication year - 2012

Publication title -

bonfring international journal of research in communication engineering

Language(s) - English

Resource type - Journals

eISSN - 2277-5080

pISSN - 2250-110X

DOI - 10.9756/bijrce.1287

Subject(s) - minimum shift keying , demodulation , communications satellite , satellite , computer science , keying , gaussian , phase shift keying , electronic engineering , telecommunications , engineering , physics , bit error rate , aerospace engineering , decoding methods , channel (broadcasting) , quantum mechanics

This paper discusses DSP based implementation of Gaussian Minimum Shift Keying (GMSK) demodulator using Polarity type Costas loop. The demodulator consists of a Polarity type Costas loop for carrier recovery, data recovery, and phase detection. Carrier has been recovered using a loop of center-frequency locking scheme as in M-ary Phase Shift Keying (MPSK) Polarity type Costas-loop. Phase unwrapping and Bit-Reconstruction is presented in detail. All the modules are first modeled in MATLAB (Simulink) and Systemview. After bit true simulation, the design is coded in VHDL and code simulation is done using QuestaSim 6.3c. The design is targeted to Virtex-4 XC4VSX35-10FF668 Xilinx FPGA (Field programmable gate array) for real time testing, which is carried out on Xtreme DSP development platform

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