DEVICE FOR ESTIMATING SOFT JUDGEMENT VALUE AND DEVICE FOR ESTIMATING MAXIMUM LIKELIHOOD SYSTEM

Metric calculating means calculates a first metric of a transmitted symbol sequence estimated by an adaptive equalizer. Then it calculates a second metric of a symbol sequence in which the polarity of a symbol in a position where the soft judgment value is to be determined in the transmitted symbol...

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Bibliographische Detailangaben
Hauptverfasser:	KONDOH, NORIAKI OKI ELECTRIC INDUSTRY CO., LTD, ONO, SHIGERU OKI ELECTRIC INDUSTRY CO., LTD, HAYASHI, HIROSHI OKI ELECTRIC INDUSTRY CO., LTD, TANAKA, TOMOKO OKI ELECTRIC INDUSTRY CO., LTD
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CODE CONVERSION IN GENERAL CODING DECODING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	Metric calculating means calculates a first metric of a transmitted symbol sequence estimated by an adaptive equalizer. Then it calculates a second metric of a symbol sequence in which the polarity of a symbol in a position where the soft judgment value is to be determined in the transmitted symbol sequence is inverted. A subtraction unit (9) subtracts the second metric from the first metric. Thereafter, a multiplication unit (10) multiplies the result of the subtraction by the symbol in the position where the soft judgment value is to be determined in the transmitted symbol sequence, thus outputting the soft judgment value.