The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지
DOI QR코드

DOI QR Code

Joint Performance of Demodulation and Decoding with Regard to Log-Likelihood Ratio Approximation

대수우도비 근사화에 따른 복조와 복호의 결합 성능

  • Park, Sung-Joon (Dept. of Electronic Engineering, Gangneung-Wonju National University) ;
  • Jo, Myung-Suk (Dept. of Electronic Engineering, Gangneung-Wonju National University)
  • Received : 2016.10.06
  • Accepted : 2016.11.07
  • Published : 2016.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In modern digital communication systems adapting high-order modulation and high performance channel code, log-likelihood ratios involving the repeated calculations of the logarithm of sum of exponential functions are necessary for demodulation and decoding. In this paper, the approximation methods called Min and MinC are applied to demodulation and decoding together and their complexity and joint performance are analyzed.

고차변조와 고효율 채널부호를 사용하는 통신시스템에서는 지수함수의 합 로그 연산을 수반하는 다량의 대수우도비 산출이 필수적이며 이의 근사화 기법에 따라 링크 성능이 좌우된다. 본 논문에서는 신규 근사화 기법을 복조기와 복호기에 결합하여 적용하고 복잡도를 분석하며 모의실험을 통해 도출한 결합 성능을 분석한다.

Keywords

References

  1. S.-J. Park, "Bitwise log-likelihood ratios for quadrature amplitude modulations," IEEE Commun. Lett., vol. 19, no. 6, pp. 921-924, Jun. 2015. https://doi.org/10.1109/LCOMM.2015.2424423
  2. P. Robertson, E. Villebrun, and P. Hoeher, "A comparison of optimal and sub-optimal MAP decoding algorithms in the log domain," in Proc. IEEE Int. Conf. Commun., pp. 1009- 1013, Seattle, WA, USA, Jun. 1995.
  3. D.-H. Kim and S.-Y. Hwang, "Design of an efficient turbo decoder by initial threshold setting," J. KICS, vol. 26, no. 5, pp. 582-591, May 2001.
  4. S. Papaharalabos, P. T. Mathiopoulos, G. Masera, and M. Martina, "On optimal and near-optimal turbo decoding using generalized max operator," IEEE Commun. Lett., vol. 13, no. 7, pp. 522-524, Jul. 2009. https://doi.org/10.1109/LCOMM.2009.090537
  5. M. R. Soleymani, Y. Gao, and U. Vilaipornsawai, Turbo Coding for Satellite and Wireless Commmunications, Kluwer, 2002.