SOFT-IN SOFT-OUT DECODER USED FOR AN ITERATIVE ERROR CORRECTION DECODER

Adders each add up an addition value sent from a metric calculator and a state metric read from a memory. A maximum value selector generates a first likelihood when a data bit is 1, based on the addition values added up by the adders. A maximum value selector generates a second likelihood when a dat...

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Bibliographische Detailangaben
Hauptverfasser:	XIE PING, TAN KAI REN, HIROKI SUGIMOTO, WANG TINGWU
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CALCULATING CODE CONVERSION IN GENERAL CODING COMPUTING COUNTING DECODING ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY PHYSICS TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	Adders each add up an addition value sent from a metric calculator and a state metric read from a memory. A maximum value selector generates a first likelihood when a data bit is 1, based on the addition values added up by the adders. A maximum value selector generates a second likelihood when a data bit is 0, based on the addition values added up by the adders. A subtracter subtracts the second likelihood from the first likelihood to generate a likelihood ratio, and a subtracter subtracts data from the likelihood ratio and generates extrinsic information. A re-normalizer multiplies the extrinsic information by a predetermined value to re-normalize it and temporarily stores it in a memory. The extrinsic information stored in the memory is used as the prior probability information for the next iterative decoding.