Three Artificial-Noise-Aided Secure Transmission Schemes in Wiretap Channels
Three Artificial-Noise-Aided Secure Transmission Schemes in Wiretap Channels
复制标题
DOI：
10.1109/tvt.2017.2779508
复制
发表时间：
2018-04
影响因子：
6.8
通讯作者：
Shihao Yan;Nan Yang;Ingmar Land;R. Malaney;Jinhong Yuan
中科院分区：
文献类型：
--
作者：
Shihao Yan;Nan Yang;Ingmar Land;R. Malaney;Jinhong Yuan
我们考察了三种人工噪声辅助的安全传输方案，即部分自适应、完全自适应和开-关方案的保密性能。为此，我们提供了新的分析，以便于优化分配给有用信号的发射功率的分数$\Phi$和冗余率$R_{\Rm{E}}$。令人惊讶的是，我们的检验表明，仅码字速率$R_{\Rm{B}}$随瞬时信道增益变化的部分自适应方案的性能显著优于$R_{\Rm{B}}$和$R_{\Rm{E}}$变化的开-关方案。这种性能增益可以用较高的平均保密率来表征，该保密率受保密中断概率的上界的约束。此外，我们的结果还表明，部分自适应方案可以获得与全自适应方案几乎相同的保密性能，但其复杂度要高得多，其中$\Phi$、$R_{\Rm{B}}$和$R_{\Rm{E}}$都随着瞬时信道增益的变化而变化。
We examine the secrecy performance of three artificial-noise-aided secure transmission schemes, namely, the partially adaptive, fully adaptive, and on–off schemes. To this end, we provide new analysis to facilitate the optimization of the fraction $\phi$ of the transmit power allocated to the useful signal and redundancy rate $R_{\rm{E}}$. Surprisingly, our examination indicates that the partially adaptive scheme, in which only the codeword rate $R_{\rm{B}}$ varies with the instantaneous channel gains, significantly outperforms the on–off scheme, in which both $R_{\rm{B}}$ and $R_{\rm{E}}$ vary. This performance gain can be characterized in terms of a higher average secrecy rate, subject to an upper bound on the secrecy outage probability. Furthermore, our results also demonstrate that the partially adaptive scheme can achieve almost the same secrecy performance as the fully adaptive scheme, which is of a much higher complexity, where $\phi$, $R_{\rm{B}}$, and $R_{\rm{E}}$ all vary with the instantaneous channel gains.