DocumentCode :
1305082
Title :
Performance analysis of GMSK frequency detection with decision feedback equalisation in digital land mobile radio
Author :
Adachi, Fumiyuki ; Ohno, Kizuku
Author_Institution :
NTT Radio Commun. Syst. Lab., Japan
Volume :
135
Issue :
3
fYear :
1988
fDate :
6/1/1988 12:00:00 AM
Firstpage :
199
Lastpage :
207
Abstract :
The bit-error-rate (BER) performance of premodulation Gaussian filtered MSK (GMSK) using frequency detection (FD) in conjunction with 1 bit decision feedback equalisation (DFE) is theoretically investigated. The introduction of the premodulation filter causes severe intersymbol interference (ISI) in the waveform of the input to the FM modulator. DFE is used for reducing the ISI effect and therefore improving the BER performance. Applying the analysis to additive white Gaussian noise (AWGN) channels (no fading) shows that a 1-bit DFE attains about 8.5 dB Eb/N0 improvement at BER=10-3 for the premodulation filter bandwidth-time product BbT=0.25 (typical for mobile radio applications) when the receiver predetection bandpass filter bandwidth-time product BT is optimised. It is shown that the effect of error propagation due to DFE is negligible and the exact BER can be well approximated by the BER that is obtained assuming the decision 1-bit prior is correct. The analysis is then extended to the case of Rayleigh fading channels. Both predetection and postdetection diversity reception are considered. When two-branch predetection maximal-ratio combining (MRC) is used, the 1-bit DFE attains about 6.3 dB Eb/N0 improvement at BER=10-3 for BbT=0.25.
Keywords :
digital communication systems; diversity reception; equalisers; error statistics; fading; feedback; intersymbol interference; minimum shift keying; mobile radio systems; AWGN channels; BER performance; FM modulator; GMSK frequency detection; ISI; Rayleigh fading channels; additive white Gaussian noise; bandwidth-time product; decision feedback equalisation; digital land mobile radio; error propagation; intersymbol interference; maximal-ratio combining; performance analysis; postdetection diversity reception; predetection diversity reception; premodulation Gaussian filtered MSK; premodulation filter; receiver predetection bandpass filter; waveform;
fLanguage :
English
Journal_Title :
Radar and Signal Processing, IEE Proceedings F
Publisher :
iet
ISSN :
0956-375X
Type :
jour
Filename :
6580
Link To Document :
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