| Summary: | 碩士 === 國立中正大學 === 電機工程學系 === 86 === Gaussian minimum shift keying (GMSK)with constant envelope and
compact spectrum is an attractive modulation technique for
satellite communications and mobile radio
applications. Some communication systems such as GSM
and DECT, use GMSK as their modulation method. Although
GMSK have many advantages, it suffers from significant
intersymbol interference(ISI) because of lower bandwidth (the
lower the bandwith, the more the ISI) and the
demodulator becomes very important. The demodulator
roughly includes the detector and the symbol timing and
frequency offset estimator. In this paper, we introduce
some differential detectors and the timing and frequency offset
estimator . Due to the advantages of the time-division multiple
access(TDMA) and it has been the standard of some communication
systems, the simulation of the performance also follows this
channel architecture. We will simulate the systems in
AWGN channel and fading channel to test the system
performance especially the ability of symbol timing and
frequency offset estimation in GMSK signal.
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