• KSII Transactions on Internet and Information Systems
    Monthly Online Journal (eISSN: 1976-7277)

Selective Demodulation Scheme Based on Log-Likelihood Ratio Threshold

Vol. 7, No. 4, April 29, 2013
10.3837/tiis.2013.04.009, Download Paper (Free):

Abstract

This paper aims at designing a selective demodulation scheme based on Log-likelihood Ratio threshold (SDLT) instead of the conventional adaptive demodulation (ADM) scheme, by using rateless codes. The major difference is that the Log-likelihood ratio (LLR) threshold is identified as a key factor to control the demodulation rate, while the ADM uses decision region set (DRS) to adjust the bit rate. In the 16-QAM SDLT scheme, we deduce the decision regions over an additive white Gaussian channel, corresponding to the variation of LLR threshold and channel states. We also derived the equations to calculate demodulation rate and bit error rate (BER), which could be proven by simulation results. We present an adaptation strategy for SDLT, and compare it with ADM and adaptive modulation (AM). The simulation results show that our scheme not only significantly outperforms the ADM in terms of BER, but also achieves a performance as good as the AM scheme. Moreover, the proposed scheme can support much more rate patterns over a wide range of channel states.


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Cite this article

[IEEE Style]
Y. Huang, *. Dong, *. Jo, Y. Liu, "Selective Demodulation Scheme Based on Log-Likelihood Ratio Threshold," KSII Transactions on Internet and Information Systems, vol. 7, no. 4, pp. 767-783, 2013. DOI: 10.3837/tiis.2013.04.009.

[ACM Style]
Yuheng Huang, *Yan Dong, *Minho Jo, and Yingzhuang Liu. 2013. Selective Demodulation Scheme Based on Log-Likelihood Ratio Threshold. KSII Transactions on Internet and Information Systems, 7, 4, (2013), 767-783. DOI: 10.3837/tiis.2013.04.009.

[BibTeX Style]
@article{tiis:20283, title="Selective Demodulation Scheme Based on Log-Likelihood Ratio Threshold", author="Yuheng Huang and *Yan Dong and *Minho Jo and Yingzhuang Liu and ", journal="KSII Transactions on Internet and Information Systems", DOI={10.3837/tiis.2013.04.009}, volume={7}, number={4}, year="2013", month={April}, pages={767-783}}