Presentation	2006-01-27 A note on the optimum demodulator in the spectrum space Yoichi SAITO,
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Abstract(in English)	This short note presents a new approach to the optimum demodulation of digital signals. Regardless of modulation schemes, transmitted signals were demodulated as a time function of signal amplitude and were decoded at the output of decision devices. In contrast with the conventional way, we observe the demodulated N symbols from spectrum space and express them as an N-dimensional complex vector. This vector is compared with prepared template vectors. The pattern-matching decoding is equivalent to the maximum likelihood decoding. The proposed method is effective to the block-coded FEC systems and the BER performances are evaluated. This note also shows the carrier synchronization algorithm that is realized by utilizing the spectral components of preamble signals for timing recovery.
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Keyword(in English)	Spectrum space / Template vector / Maximum likelihood decoding / FEC / Carrier synchronization
Paper #	RCS2005-169
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Conference Information
Committee	RCS
Conference Date	2006/1/20(1days)
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Paper Information
Registration To	Radio Communication Systems (RCS)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	A note on the optimum demodulator in the spectrum space
Sub Title (in English)
Keyword(1)	Spectrum space
Keyword(2)	Template vector
Keyword(3)	Maximum likelihood decoding
Keyword(4)	FEC
Keyword(5)	Carrier synchronization
1st Author's Name	Yoichi SAITO
1st Author's Affiliation	Faculty of Systems Engineering, Wakayama University()
Date	2006-01-27
Paper #	RCS2005-169
Volume (vol)	vol.105
Number (no)	560
Page	pp.pp.-
#Pages	6
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