Browse > Article
http://dx.doi.org/10.7840/kics.2012.37A.9.738

Approximated Soft-Decision Demapping Algorithm for Coded 4+12+16 APSK  

Lee, Jaeyoon (한국전자통신연구원)
Jang, Yeonsoo (한양대학교 융합전자공학부)
Yoon, Dongweon (한양대학교 융합전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37A, no.9, 2012 , pp. 738-745 More about this Journal
Abstract
This paper proposes an approximated soft decision demapping algorithm with low computational complexity for coded 4+12+16 amplitude phase shift keying (APSK) in an additive white Gaussian noise (AWGN) channel. To derive the proposed algorithm, we approximate the decision boundaries for 4+12+16 APSK symbols, and then decide the log likelihood ratio (LLR) value for each bit from the approximated decision boundaries. Although the proposed algorithm shows about 0.6~1.1dB degradation on the error performance compared with the conventional max-log algorithm, it gives a significant result in terms of the computational complexity.
Keywords
Amplitude Phase Shift Keying (APSK); iterative decoding; log likelihood ratio (LLR);
Citations & Related Records
연도 인용수 순위
  • Reference
1 C. D. Ryu, J. W. Park, and M. H. Sunwoo, "Simplified soft-decision demapping algorithm for digital video broadcasting system," IET Electronics Letters, vol. 46, no. 12, pp. 840-842, Apr. 2010.   DOI   ScienceOn
2 J. Lee, D. Yoon, and S. Park, "New bits-to-symbol mapping for 32 APSK over nonlinear satellite channels," IEICE Transactions on Communications, vol. E92-B, no. 11, pp. 3384-3388, Nov. 2009.   DOI   ScienceOn
3 M. Zhang and S. Kim, "Efficient soft demapping for M-ary APSK," in Proc. ICTC 2011, Seoul, Korea, pp. 641-644, Sept. 2011.
4 J. Lee, D. Yoon, and K. Hyun, "Exact and general expression for the error probability of arbitrary two-dimensional signaling with I/Q amplitude and phase unbalances," IEICE Transactions on Communications, vol. E89-B, no.12, pp. 3356-3362, Dec. 2006.   DOI
5 T. Clevorn, F. Oldewurtel, S. Godtmann, and P. Vary, "Iterative demodulation for DVB-S2," in Proc. IEEE PIMRC 2005, Berlin, Germany, pp. 2576-2580, Sept. 2005.
6 Coding, Modulation, and Link Protocol (CMLP) Study Report, National Aeronautics and Space Administration (NASA)-Space Communication and Navigation (SCaN), Jan. 2008.
7 A. J. Viterbi, "An intuitive justification and a simplified implementation of the MAP decoder for convolutional codes," IEEE Journal on Selected Areas in Communications, vol. 16, no. 2, pp. 260-264, Feb. 1998.   DOI   ScienceOn
8 Digital Video Broadcasting (DVB); Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications (DVB-S2), European Telecommunications Standards Institute (ETSI) EN 302 307 v1.2.1, 2009.
9 "Research and Development for Space Data System Standards: Flexible Serially Concatenated Convolutional Turbo Codes With Near-Shannon Bound Performance For Telemetry Applications," Orange book CCSDS 131.2-O-1, Sep. 2007.