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| Polar Code for Physical Layer Security in Multi-antenna Systems |
| BAI Huiqing JIN Liang XIAO Shuaifang YI Ming* |
| (National Digital Switching System Engineering and Technological Research Center, Zhengzhou 450002, China) |
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Abstract A maximal-capacity-difference mapping-based secrecy polar coding method is proposed. It improves the secrecy rate by reducing the channel polarization speed. First, the polarized channels are divided into two categoryies based on the polarization structure: the good quality ones and the bad quality ones. By analyzing the eraser rates of the polarized channels, a maximal-capacity-difference mapping method is proposed. Through improving the capacity of the bad polarized channels and reducing that of the good polarized channels, the channel polarization speed decreases efficiently. Finally, weighting is adopted to modify the maximal-capacity-difference mapping results between legitimate channels and wiretap channels, thus the secrecy polar coding in multi-input channel is implemented. Simulation results verify that the secrecy rate of proposed method in binary erasure channels can be increased from 0.029 and 0.004 to 0.042, compared to the random mapping method and Arikan’s method at polarization order n=9, respectively. And the proposed method also works in fading channels.
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Received: 19 January 2017
Published: 27 June 2017
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| Fund:The National 863 Program of China (2015AA01A708), The National Natural Science Foundation for Young Scientists of China (61501516) |
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Corresponding Authors:
YI Ming
E-mail: acco666666@sina.com
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