DocumentCode :
2654542
Title :
GMSK Demodulator Using Costas Loop for Software-Defined Radio
Author :
Shah, Santosh ; Sinha, V.
Author_Institution :
LNM Inst. of Inf. Technol. Jaipur, Jaipur
fYear :
2009
fDate :
22-24 Jan. 2009
Firstpage :
757
Lastpage :
761
Abstract :
DSP based implementation of Gaussian minimum shift keying (GMSK) demodulator using Costas loop has been described. The demodulator consists of a Costas loop for carrier recovery, data recovery, and phase detection. For low data rates, we have tested the scheme on a TIpsilas DSP TMS-320C6713. These are implemented using MATLAB and SIMULINK tools and tested on TIpsilas DSP using code composure studio (CCS). Carrier has been recovered using a loop of center-frequency locking scheme as in binary phase shift keying (BPSK) Costas-loop. Demodulator performance for AWGN channel for different data rates is shown. Performance is measured for bandwidth time product (BT = 0.3 and 0.5) with data rate between 8 kbps to 256 kbps. Bit synchronization and image coding and decoding are designed according to the need of demodulator. The scheme may find its use in software-defined radio (SDR) applications.
Keywords :
AWGN channels; frequency shift keying; minimum shift keying; phase shift keying; signal processing; software radio; synchronisation; AWGN channel; Costas loop; DSP TMS-320C6713; GMSK demodulator; Gaussian minimum shift keying demodulator; MATLAB tool; SIMULINK tool; bandwidth time product; binary phase shift keying; bit synchronization; carrier recovery; center-frequency locking scheme; code composure studio; data recovery; digital signal processing; image coding; image decoding; phase detection; software-defined radio; AWGN channels; Bandwidth; Binary phase shift keying; Carbon capture and storage; Demodulation; Digital signal processing; MATLAB; Phase detection; Testing; Time measurement; SDR; carrier recovery; costas loop; gmsk demodulator; mobile commuincation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Computer Control, 2009. ICACC '09. International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-3330-8
Type :
conf
DOI :
10.1109/ICACC.2009.81
Filename :
4777444
Link To Document :
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