NDLI: Graphical demonstration of the coherent demodulation of GMSK

Content Provider	IEEE Xplore Digital Library
Author	Ho Huat Peh Tjeng Thiang Tjhung Adachi, F. Quek, T.Q.S.
Copyright Year	2010
Description	Author affiliation: Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University, Japan (Adachi, F.) \|\| Institute for Infocomm Research, A*STAR, #21-01 Connexis, 1 Fusionopolis Way, Singapore 138632 (Ho Huat Peh; Tjeng Thiang Tjhung; Quek, T.Q.S.)
Abstract	In this paper, we demonstrate through graphical means the coherent demodulation of Gaussian Minimum-Shift-Keying (GMSK) that is made possible because the pulses after the Gaussian lowpass filter retain the unit area such that the phase deviation has the π/2 value. Although it is straightforward to show analytically that the MSK waveform can be split into two antipodal pulse streams modulating an in-phase and quadrature carriers, so that coherent demodulation can be applicable, it is not the case with GMSK, because the modulating signal consists of overlapping pulses with analytically intractable Q function describing the pulse shape. By computing the access phase function θ(t) and plotting cos θ(t) and sin θ(t), we can see that the plots of cos θ(t) and sin θ(t) for GMSK retain the synchronized and staggered nature of those of MSK, suggesting the possibility of coherent demodulation as in MSK. We then show a simple way to compute the bit error probability of GMSK for a few values of the Gaussian lowpass filter bandwidth.
Starting Page	1
Ending Page	5
File Size	1101865
Page Count	5
File Format	PDF
ISBN	9781424470556
e-ISBN	9781424470587
DOI	10.1109/ICCE.2010.5670671
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-08-11
Publisher Place	Vietnam
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Error probability bit error probability Voltage-controlled oscillators Frequency shift keying Binary phase shift keying Coherent Demodulation Demodulation GMSK
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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