Performance of high rate turbo codes employing the soft-output Viterbi algorithm (SOVA)

Ali Ghrayeb, William E. Ryan

Research output: Contribution to journalArticle

5 Citations (Scopus)


We examine the performance of the iterative soft-output Viterbi algorithm (SOVA) for high rate turbo codes on an additive white Gaussian noise (AWGN) channel and compare its performance to that of the APP algorithm. Code rates of the form k0/k0+1 (K0 = 4, 8, 16, 32, and 64) are considered. In our simulations, we show that the SOVA algorithm yields a bit error probability (Pb) performance that is only about 0.7 dB inferior to the performance of the APP algorithm and about 1.7 dB from the capacity limit at Pb = 10-5. We also examine SOVA performance as a function of the number of iterations and a parameter we call the reliability depth.

Original languageEnglish
Pages (from-to)1665-1669
Number of pages5
JournalConference Record of the Asilomar Conference on Signals, Systems and Computers
Publication statusPublished - 1999
Externally publishedYes


ASJC Scopus subject areas

  • Hardware and Architecture
  • Signal Processing
  • Electrical and Electronic Engineering

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