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Revisiting the Max-Log-Map algorithm with SOVA updates rules: new simplifications for high-radix SISO decoders

Le, Vinh Hoang Son; Abdel Nour, Charbel; Boutillon, Emmanuel; Douillard, Catherine


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{
  "description": "<p>This paper proposes a new soft-input soft-output&nbsp;decoding algorithm particularly suited for low-complexity highradix&nbsp;turbo decoding, called local soft-output Viterbi algorithm&nbsp;(local SOVA). The local SOVA uses the forward and backward&nbsp;state metric recursions just as the conventional Max-Log MAP (MLM) algorithm does, and produces soft outputs&nbsp;using the SOVA update rules. The proposed local SOVA exhibits&nbsp;a lower computational complexity than the MLM algorithm&nbsp;when employed for high-radix decoding in order to increase&nbsp;throughput, while having the same error correction performance&nbsp;even when used in a turbo decoding process. Furthermore, with&nbsp;some simplifications, it offers various trade-offs between error&nbsp;correction performance and computational complexity. Actually,&nbsp;employing the local SOVA algorithm for radix-8 decoding of the&nbsp;LTE turbo code reduces the complexity by 33% without any&nbsp;performance degradation and by 36% with a slight penalty of&nbsp;only 0.05 dB. Moreover, the local SOVA algorithm opens the door&nbsp;for the practical implementation of turbo decoders for radix-16&nbsp;and higher.</p>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "IMT Atlantique", 
      "@type": "Person", 
      "name": "Le, Vinh Hoang Son"
    }, 
    {
      "affiliation": "IMT Atlantique", 
      "@type": "Person", 
      "name": "Abdel Nour, Charbel"
    }, 
    {
      "affiliation": "IMT Atlantique", 
      "@type": "Person", 
      "name": "Boutillon, Emmanuel"
    }, 
    {
      "affiliation": "IMT Atlantique", 
      "@type": "Person", 
      "name": "Douillard, Catherine"
    }
  ], 
  "headline": "Revisiting the Max-Log-Map algorithm with SOVA updates rules: new simplifications for high-radix SISO decoders", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2019-12-06", 
  "url": "https://zenodo.org/record/3565262", 
  "@type": "ScholarlyArticle", 
  "keywords": [
    "convolutional codes", 
    "oft-input soft-ouput decoding", 
    "soft-ouput Viterbi algorithm", 
    "high-radix decoding", 
    "turbo codes", 
    "high throughput"
  ], 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.5281/zenodo.3565262", 
  "@id": "https://doi.org/10.5281/zenodo.3565262", 
  "workFeatured": {
    "@type": "Event", 
    "name": "IEEE Transactions on Communications"
  }, 
  "name": "Revisiting the Max-Log-Map algorithm with SOVA updates rules: new simplifications for high-radix SISO decoders"
}
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