Patent History
  • Application
    US 11/221311 2005-09-07
  • Publication
    US 2007055919 2007-03-08

published patent: Embedded state metric storage for MAP decoder of turbo codes

TitleEmbedded state metric storage for MAP decoder of turbo codes
Priority Date2005-09-07 US 11/221311
Inventors
Issue Date2007
Citation
US Published patent application US 2007055919. Washington, DC: US Patent and Trademark Office (USPTO), 2007 How to Cite?
AbstractA method, an embedded state metric storage, is used for MAP (Maximum A Posterior)-based decoder of turbo codes to reduce the memory requirement of state metric storage. For MAP decoder, this method comprises selecting any state metric from the updated state metrics for each recursion direction, forward and reverse, and dividing the state metrics by the selected state metric; the selected state metric value becomes a constant, namely, one. The constant one state metric is embedded into the resulted state metrics. For log-MAP decoder, this method comprises selecting any state metric from the updated state metrics in each direction, forward and reverse, and subtracting the state metrics from the selected state metric; the selected state metric value becomes a constant, zero. The constant zero state metric is embedded into the resulted state metrics.; One advantage of the embedded state metric storage during state metric updating and likelihood ratio calculation is to embed the information of the selected state metric into the resulted state metrics. Thus, the selected state metric is not required to be kept in the state metric memory, and calculation of a constant state metric in the resulted state metric can be omitted. Therefore, the latency and the area of implementation in ASIC will be reduced with this method of embedded state metric storage.
Persistent Identifierhttp://hdl.handle.net/10722/176930

 

DC FieldValueLanguage
dc.date.accessioned2012-11-30T08:38:46Z-
dc.date.available2012-11-30T08:38:46Z-
dc.date.issued2007-
dc.identifier.citationUS Published patent application US 2007055919. Washington, DC: US Patent and Trademark Office (USPTO), 2007en_HK
dc.identifier.urihttp://hdl.handle.net/10722/176930-
dc.description.abstractA method, an embedded state metric storage, is used for MAP (Maximum A Posterior)-based decoder of turbo codes to reduce the memory requirement of state metric storage. For MAP decoder, this method comprises selecting any state metric from the updated state metrics for each recursion direction, forward and reverse, and dividing the state metrics by the selected state metric; the selected state metric value becomes a constant, namely, one. The constant one state metric is embedded into the resulted state metrics. For log-MAP decoder, this method comprises selecting any state metric from the updated state metrics in each direction, forward and reverse, and subtracting the state metrics from the selected state metric; the selected state metric value becomes a constant, zero. The constant zero state metric is embedded into the resulted state metrics.; One advantage of the embedded state metric storage during state metric updating and likelihood ratio calculation is to embed the information of the selected state metric into the resulted state metrics. Thus, the selected state metric is not required to be kept in the state metric memory, and calculation of a constant state metric in the resulted state metric can be omitted. Therefore, the latency and the area of implementation in ASIC will be reduced with this method of embedded state metric storage.en_HK
dc.relation.isreferencedbyWO 2009158341 (A3) 2010-05-06en_HK
dc.relation.isreferencedbyWO 2009158341 (A2) 2009-12-30en_HK
dc.relation.isreferencedbyUS 2009228768 (A1) 2009-09-10en_HK
dc.relation.isreferencedbyUS 2009172502 (A1) 2009-07-02en_HK
dc.relation.isreferencedbyUS 8230311 (B2) 2012-07-24en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License For Public Patent Documentsen_US
dc.titleEmbedded state metric storage for MAP decoder of turbo codesen_HK
dc.typePatenten_US
dc.description.naturepublished_or_final_versionen_US
dc.contributor.inventorLi, VOKen_HK
dc.contributor.inventorHu Jianhaoen_HK
dc.contributor.inventorWong Alfred Ken_HK
patents.identifier.applicationUS 11/221311en_HK
patents.description.assigneeTHE UNIVERSITY OF HONG KONGen_HK
patents.description.countryUnited States of Americaen_HK
patents.date.publication2007-03-08en_HK
patents.identifier.hkutechidEEE-2005-00196-1-
patents.date.application2005-09-07en_HK
patents.date.priority2005-09-07 US 11/221311en_HK
patents.description.ccUSen_HK
patents.identifier.publicationUS 2007055919en_HK
patents.relation.familyUS 2007055919 (A1) 2007-03-08en_HK
patents.relation.familyUS 7441174 (B2) 2008-10-21en_HK
patents.description.kindA1en_HK
patents.typePatent_publisheden_HK

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