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Journal of RF-Engineering and Telecommunications

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Volume 71, Issue 1-2


Threshold-Based Bit Error Rate for Stopping Iterative Turbo Decoding in a Varying SNR Environment

Roslina MohamadORCID iD: http://orcid.org/0000-0002-7139-3513 / Harlisya Harun
  • Corresponding author
  • Aerospace Engineering Department, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
  • Avionics Section, UniKL MIAT, Lot 2891, Jalan Jenderam Hulu, 43800 Dengkil, Selangor, Malaysia
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  • Other articles by this author:
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/ Makhfudzah Mokhtar
  • Computer and Communication System Engineering Department, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
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/ Wan Azizun Wan Adnan
  • Computer and Communication System Engineering Department, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
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  • De Gruyter OnlineGoogle Scholar
/ Kaharudin Dimyati
  • Electrical and Electronic Engineering Department, Universiti Pertahanan Nasional Malaysia, 57000 Kuala Lumpur, Malaysia
  • Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Published Online: 2016-08-03 | DOI: https://doi.org/10.1515/freq-2016-0018


Online bit error rate (BER) estimation (OBE) has been used as a stopping iterative turbo decoding criterion. However, the stopping criteria only work at high signal-to-noise ratios (SNRs), and fail to have early termination at low SNRs, which contributes to an additional iteration number and an increase in computational complexity. The failure of the stopping criteria is caused by the unsuitable BER threshold, which is obtained by estimating the expected BER performance at high SNRs, and this threshold does not indicate the correct termination according to convergence and non-convergence outputs (CNCO). Hence, in this paper, the threshold computation based on the BER of CNCO is proposed for an OBE stopping criterion (OBEsc). From the results, OBEsc is capable of terminating early in a varying SNR environment. The optimum number of iterations achieved by the OBEsc allows huge savings in decoding iteration number and decreasing the delay of turbo iterative decoding.

Keywords: bit error rate; estimation error; stopping criterion; turbo codes; iterative decoding


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About the article

Received: 2016-01-21

Published Online: 2016-08-03

Published in Print: 2017-01-01

This work was supported in part by the Universiti Teknologi Mara (UiTM) through Lestari grant number 600-RMI/DANA 5/3/LESTARI (89/2015).

Citation Information: Frequenz, Volume 71, Issue 1-2, Pages 83–94, ISSN (Online) 2191-6349, ISSN (Print) 0016-1136, DOI: https://doi.org/10.1515/freq-2016-0018.

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