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JMT 2012, Vol. 20 Issue (4) :243-248     DOI: 10.3969/j.issn.2095-087X.2012.04.008
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Achievable secrecy rate of bit-interleaved coded modulation schemes
Weichen XIANG, Stéphane Le Goff, Zhiguo DING*
School of Electrical and Electronic Engineering, Newcastle University, NE1 7RU, UK

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Abstract We study the impact of various modulation mapping strategies and signal constellation shapes on the secrecy rates achievable with bit-interleaved coded modulation (BICM) schemes. Transmission over an ergodic Rayleigh fading channel is assumed throughout this work. Various constellations and mapping techniques are considered in this work to maximize the capacity difference between the main channel and the eavesdropper channel, rather than to optimize the capacity of both channels. We show that in terms of achievable secrecy rate, Gray and Quasi-Gray mappings only perform well at low SNR but outperformed by other mapping techniques when SNR increases. The proper design of signal mapping can significantly enhance the achievable secrecy rate in BICM schemes. It is indicated that the key parameter to the secrecy rate of a BICM system is the distance spectrum of Euclidean distances for mappings.
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Articles by authors
Weichen XIANG
St閜hane Le Goff
Zhiguo DING
Keywordssecrecy capacity   mapping   ergodic fading channel   bit-interleaved coded modulation     
Received 2012-10-19;
Cite this article:   
Weichen XIANG, Stéphane Le Goff, Zhiguo DING.Achievable secrecy rate of bit-interleaved coded modulation schemes[J]  JMT, 2012,V20(4): 243-248
http://jmt.swjtu.edu.cn/EN/10.3969/j.issn.2095-087X.2012.04.008      or     http://jmt.swjtu.edu.cn/EN/Y2012/V20/I4/243
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