高斯窃听信道中删余Polar码的设计方法研究

发布时间：2018-06-11 17:23

本文选题：物理层安全编码 + 窃听信道　；参考：《信号处理》2014年11期

【摘要】：本文针对高斯窃听信道模型下的物理层安全问题,提出一种基于删余Polar码的、拥有编码比特的可信度计算的物理层安全编码方案。方案考虑到信道噪声对译码结果的影响,通过Bhattacharyya参数评估各信息比特的恢复差错概率,并将这恢复差错概率应用于编码比特的可信度计算。理论证明所提出的方案可使窃听者保持较高误码率,同时合法用户在高于自身信噪比门限时保证较低误码率。数值仿真结果表明所提出的安全编码方案能够有效地减小安全间隙。当窃听信道质量比合法信道质量稍差时窃听者误码率能迅速逼近0.5,而合法信道的误码率能够降到10-5以下,大大地降低了Bob和Eve间的安全间隙。
[Abstract]:Aiming at the problem of physical layer security in Gao Si eavesdropping channel model, this paper presents a physical layer security coding scheme based on censored Polar code and confidence calculation with coding bits. Considering the influence of channel noise on the decoding result, the Bhattacharyya parameter is used to evaluate the recovery error probability of each information bit, and the recovery error probability is applied to the credibility calculation of the coded bit. It is proved theoretically that the proposed scheme can keep the eavesdropper with a high bit error rate, while the legitimate user can guarantee a lower bit error rate when it is higher than the signal-to-noise ratio threshold of the eavesdropper. Numerical simulation results show that the proposed security coding scheme can effectively reduce the security gap. When the quality of eavesdropping channel is slightly worse than that of legitimate channel, the BER of eavesdropper can approach 0.5 rapidly, while the BER of legitimate channel can be reduced to less than 10-5, which greatly reduces the security gap between Bob and Eve.
【作者单位】：南京邮电大学通信与信息工程学院;
【基金】：国家自然科学基金(61271238) 教育部高等学校博士学科点专项科研基金(20123223110003) 江苏省高校自然科学研究项目资助(11KJA510002)
【分类号】：TN918

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