Journal article Open Access

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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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.3565262", 
  "container_title": "IEEE Transactions on Communications", 
  "title": "Revisiting the Max-Log-Map algorithm with SOVA updates rules: new simplifications for high-radix SISO decoders", 
  "issued": {
    "date-parts": [
      [
        2019, 
        12, 
        6
      ]
    ]
  }, 
  "abstract": "<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>", 
  "author": [
    {
      "family": "Le, Vinh Hoang Son"
    }, 
    {
      "family": "Abdel Nour, Charbel"
    }, 
    {
      "family": "Boutillon, Emmanuel"
    }, 
    {
      "family": "Douillard, Catherine"
    }
  ], 
  "id": "3565262", 
  "type": "article-journal", 
  "event": "IEEE Transactions on Communications"
}
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