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Simplified soft-decision demapping algorithm for digital video broadcasting system

Simplified soft-decision demapping algorithm for digital video broadcasting system

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A simplified soft-decision demapping algorithm for digital video broadcasting via satellite, second generation (DVB-S2), is presented. The proposed algorithm can reduce the computational complexity required to compute the log likelihood ratio values between the received noisy symbol and possible constellation points compared to conventional algorithms. The simulation results show that the proposed algorithm has negligible performance degradation compared with conventional algorithms. Compared with the maximum algorithm, the proposed algorithm can reduce the hardware resources required by about 81%.

References

    1. 1)
      • Allpress, S., Luschi, C., Felix, S.: `Exact and approximated expressions of the log-likelihood ratio for 16-Qam signals', Proc. 38th Asilomar Conf. on Signals, Systems and Computers, November 2004, CA, USA, 1, p. 794–798.
    2. 2)
      • Choi, S.H., Oh, C.I., Oh, D., Chang, D.: `The mapping and demapping algorithms for high order modulation of DVB-S2 systems', Proc. Asia-Pacific Conf. on Communications, August 2006, Mumbai, India.
    3. 3)
      • Lee, I., Chang, D., Oh, D.: `Multi-level modulation LDPC decoding algorithm for new generation DVB-S2 system', Proc. 24th AIAA Int. Communications Satellite Systems Conf., June 2006, San Diego, CA, USA.
    4. 4)
      • Digital video broadcasting (DVB); User guidelines for the second generation system for broadcasting, interactive services, news gathering and other broad-band satellite applications (DVB-S2), European Telecommunications Standards Institute (ETSI), TR 102 376, 2005.
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