Title :
A simple coherent GMSK demodulator
Author :
Lakkis, Ismail ; Su, Jing ; Kato, Shuzo
Author_Institution :
Omniwireless Inc., San Diego, CA, USA
Abstract :
We show that a symbol-by-symbol detector is the optimal MLSE demodulator for Gaussian minimum-shift keying (GMSK) (BT=0.3) on both AWGN and a class of weakly dispersive multipath fading channels. Furthermore, it is shown that, for the remaining weakly dispersive channels, a 2 state Viterbi equalizer is optimum. As an illustration of the importance of this result, a receiver is proposed which can reduce the power consumption of GSM handsets using conditional equalization, as more than 70% of the time the channel is considered to be weakly dispersive
Keywords :
AWGN channels; cellular radio; demodulation; dispersive channels; equalisers; fading channels; maximum likelihood sequence estimation; minimum shift keying; multipath channels; power consumption; radio receivers; AWGN channels; GSM handsets; Gaussian minimum-shift keying; MLSE demodulator; Viterbi equalizer; coherent GMSK demodulator; conditional equalization; dispersive channels; fading channels; multipath channels; power consumption; receiver; symbol-by-symbol detector; AWGN; Demodulation; Detectors; Dispersion; Energy consumption; Equalizers; Fading; GSM; Maximum likelihood estimation; Viterbi algorithm;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2001 12th IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-7244-1
DOI :
10.1109/PIMRC.2001.965402
