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Demapping Algorithm for Applying the Multilevel Modulation Scheme to LDPC Decoding Based on DVB-S2  

Jung Ji-Won (Department of Radio Science & Engineering, Korea Maritime University)
Jeong Jin-Hee (Department of Radio Science & Engineering, Korea Maritime University)
Kim Min-Hyuk (Department of Radio Science & Engineering, Korea Maritime University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.17, no.7, 2006 , pp. 615-622 More about this Journal
Abstract
DVB-S2 offers various coding rate and modulation schemes. Therefore this paper proposes bit split methods to applying to multilevel modulation. Log-likelihood ratio method splits multilevel symbols to soft decision symbols using the received in-phase and quadrature component based on Gaussian approximation. However it is too complicate to calculate and to implement hardware due to exponential and logarithm calculation. Therefore this paper presents Euclidean, MAX and Sector method to reduce the high complexity of LLR method.
Keywords
Bit Split Method; LDPC; Multilevel;
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1 R. G. Gallager, 'Low-density parity-check codes', IRE Trans. Information Theory, vol. 8, pp. 21-28, 1962   DOI   ScienceOn
2 G. Ungerboeck, 'Channel coding with multilevel/phase signals', IEEE Trans. on Information Theory, vol. IT-28, no. 1, Jan. 1982
3 'Digital video broadcasting(DVB): Framing structure, channel coding and modulation for digital satellite news gathering(DSNG) and other contribution applications by satellite', ETSI EN 301 210: European Standard C. C. Clark and J. B. Cain, Error Correcting Coding for Digital Communications, Plenum Press, 1981
4 L. R. Bahl et al., 'Optimal decoding of linear code for minimizing symbol error rate', Trans. on Info. Theory, vol. IT-20, pp. 248-287, Mar. 1994
5 S. Allpress, C. Luschi, and S. Felix, 'Exact and approximated expressions of the log-likelihood ratio for 16-Qam signals', 38th Asilomar Conference on Signal, System and Computer, vol. 1, pp. 794-798, 2004
6 C. Berrou, A. Glavieux, and P. Thitimajshima, 'Near Shannon limit error-correcting code and decoding: Turbo codes', in Proc. of ICC'93, 1993
7 D. J. C. Mackay, R. M. Neal, 'Near Shannon limit performance of low-density parity-check codes', Electron. Letter, vol. 32, pp. 1645-1646, Aug. 1996   DOI   ScienceOn