论文标题
从对手的相位角度不确定性中获得的秘密沟通收益
Covert Communication Gains from Adversary's Uncertainty of Phase Angles
论文作者
论文摘要
这项工作调查了智能反射表面（IRS）秘密通信的相位增益，这是复杂值添加的白色高斯噪声（AWGN）通道的相位。发射器爱丽丝（Alice）打算通过反映射频频率（RF）源的广播信号来传输秘密消息，同时使对手威利的检测器任意接近无效。我们的分析表明，与经典AWGN通道的秘密能力相比，我们可以通过利用威利的相位角度的不确定性来实现价值2的秘密性增益。当可能的相角对数$ n = 2 $时，就可以实现这种秘密性增益。更有趣的是，我们的结果表明，即使$ n \ ge 2 $，即使它接近无穷大，秘密性收益也不会进一步增加。
This work investigates the phase gain of intelligent reflecting surface (IRS) covert communication over complex-valued additive white Gaussian noise (AWGN) channels. The transmitter Alice intends to transmit covert messages to the legitimate receiver Bob via reflecting the broadcast signals from a radio frequency (RF) source, while rendering the adversary Willie's detector arbitrarily close to ineffective. Our analyses show that, compared to the covert capacity for classical AWGN channels, we can achieve a covertness gain of value 2 by leveraging Willie's uncertainty of phase angles. This covertness gain is achieved when the number of possible phase angle pairs $N=2$. More interestingly, our results show that the covertness gain will not further increase with $N$ as long as $N \ge 2$, even if it approaches infinity.
