基于极性编码 OFDM 自适应比特信道选择的新型物理层安全方案

IF 5.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Open Journal of Vehicular Technology Pub Date : 2024-09-17 DOI:10.1109/OJVT.2024.3462599
Yuki Kuraya;Hideki Ochiai
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引用次数: 0

摘要

我们针对基于极性编码的 OFDM 无线通信系统中的窃听信道提出了一种新的物理层安全方案。我们的方法基于自适应比特信道选择,即根据主信道的频率选择性来选择极化码的输入比特信道。具体来说,极地编码由合法接收器根据其观测到的信道状态信息(CSI)构建,接收器将生成的编码结构通知发射器。由于所提出的方案只试图改善主信道的块误码率(BLER)性能,因此只要窃听者的信道与合法接收器的信道不是高度相关,该方案就能显著提高窃听信道的性能。在窃听信道与主信道不相关的假设下,仿真结果表明,即使在窃听者完全知道所选极地编码结构(即合法接收器选择用于信息传输的一组比特信道)的最坏情况下,主信道也能比窃听信道获得显著的性能提升。我们还考虑了主信道和窃听信道相关的情况,发现即使存在轻微的信道相关性,我们的方法也是有效的。最后,我们还研究了信道估计误差对结果 BLER 的影响,指出了在接收端准确获取 CSI 的重要性。
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A New Physical Layer Security Scheme Based on Adaptive Bit Channel Selection for Polar-Coded OFDM
We propose a new physical layer security scheme for a wiretap channel in polar-coded OFDM-based wireless communication systems. Our approach is based on the adaptive bit channel selection , where the input bit channels of polar code are selected according to the frequency selectivity of the main channel. Specifically, the polar code is constructed by the legitimate receiver based on its observed channel state information (CSI), and the receiver informs the transmitter of the resulting code structure. Since the proposed scheme attempts to improve the block error rate (BLER) performance exclusively for the main channel, it provides a significant performance gain over the wiretap channel, as long as the channel of the eavesdropper is not highly correlated with that of the legitimate receiver. On the assumption that the wiretap channel is uncorrelated with the main channel, simulation results demonstrate that the main channel can achieve significant performance gains over the wiretap channel, even under the worst-case scenario where the selected polar code structure (i.e., a set of the bit channels selected by the legitimate receiver for information transmission) is completely known to the eavesdropper. We also consider the case where the main channel and wiretap channel are correlated and reveal that our approach is effective even in the presence of mild channel correlation. Finally, the effect of the channel estimation error on the resulting BLER is also examined, pointing out the importance of accurate CSI acquisition at the receiver side.
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来源期刊
CiteScore
9.60
自引率
0.00%
发文量
25
审稿时长
10 weeks
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