In jammer-assisted covert communication scenarios, jamming signals also degrade the communication between legitimate users. Considering that it is difficult for a transmitter to obtain all the required channel state information (CSI), we propose an adaptive power control strategy with partial CSI, which decreases the outage probability while bringing more uncertainty to a warden. Specifically, we adopt an upper confidence limit to estimate the unknown CSI from the jammer to the receiver. Under warden’s optimal detector, we analyze the maximum covert throughput by optimizing the upper confidence limit. A closed-form expression of the optimized upper confidence limit is derived in certain cases. The numerical results validate the effectiveness of the proposed strategy and guide the estimation of unknown CSI.

中文翻译：

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用于具有部分信道状态信息的协作隐蔽通信的自适应功率控制


在干扰器辅助的隐蔽通信场景中，干扰信号也会降低合法用户之间的通信质量。考虑到发射机很难获得所有所需的信道状态信息（CSI），我们提出了一种具有部分CSI的自适应功率控制策略，该策略降低了中断概率，同时给管理员带来了更多的不确定性。具体来说，我们采用置信上限来估计从干扰器到接收器的未知 CSI。在 Warden 的最优检测器下，我们通过优化置信上限来分析最大隐蔽吞吐量。在某些情况下导出优化置信上限的封闭式表达式。数值结果验证了所提出策略的有效性，并指导未知CSI的估计。