Title :
Detection and Performance of Coded FSK Wireless Telemeter Signals
Author :
Liu, Wei ; Zhang, Chun-Yang ; Xiang, Fei
Author_Institution :
Sch. of Electron. Inf. Eng., Henan Univ. of Sci. & Technol., Luoyang
Abstract :
The noncoherent symbol-by-symbol maximum a posteriori (MAP) detection and the soft-decision Viterbi decoding in a convolutionally coded frequency shift-keying (FSK) telemeter system are studied and the performance of coded FSK telemeter system in flat Rayleigh-fading channel is also analyzed. The coded bit metrics of FSK signal are calculated by MAP detector, and the bit metrics are applied in realization of soft-decision Viterbi decoding. The results show that the reliability of FSK telemeter system can be improved by MAP detection and soft-decision Viterbi decoding. Compared with the envelop detection and hard-decoding of coded FSK signal over flat Rayleigh-fading channel, the potential gain of 6-8 dB can be obtained by using MAP detection and soft-decision Viterbi detection.
Keywords :
Rayleigh channels; Viterbi decoding; convolutional codes; frequency shift keying; maximum likelihood estimation; modulation coding; radiotelemetry; signal detection; coded FSK wireless telemeter signals; coded bit metrics; convolutionally coded frequency shift-keying telemeter system; envelop detection; flat Rayleigh-fading channel; gain 6 dB to 8 dB; hard-decoding; maximum a posteriori detection; noncoherent MAP detection; signal detection; soft-decision Viterbi decoding; symbol-by-symbol MAP detection; Convolution; Convolutional codes; Decoding; Fading; Frequency shift keying; Rayleigh channels; Signal processing; Telemetry; Viterbi algorithm; Wireless sensor networks; Viterbi decoding; convolutional coding; frequency shift keying; maximum a posteriori detection; wireless telemetry;
Conference_Titel :
Networking and Digital Society, 2009. ICNDS '09. International Conference on
Conference_Location :
Guiyang, Guizhou
Print_ISBN :
978-0-7695-3635-4
DOI :
10.1109/ICNDS.2009.40
