论文标题
秘密无线通信在准静态褪色下与渠道不确定性
Covert Wireless Communications under Quasi-Static Fading with Channel Uncertainty
论文作者
论文摘要
Covert Communications使发射器能够在对手的存在下可靠地发送信息，后者希望检测到传输是否发生。我们考虑通过准静态块褪色频道上的秘密通信，用户患有渠道不确定性。我们研究了两种极端情况下的对手威利的最佳检测性能，即完美的渠道状态信息（CSI）和频道分布信息（CDI）的情况。结果表明，在大型检测错误制度中，威利对这两种情况的检测性能基本上是无法区分的，这意味着CSI的质量并不能帮助威利改善其检测性能。该结果使我们能够研究秘密传输设计，而无需考虑Willie的确切通道不确定性量。然后，我们获得了秘密传输设计的最佳和次优闭合溶液。我们的结果表明，准静态褪色通道和先前研究的非衰落AWGN通道案例之间的设计基本差异。
Covert communications enable a transmitter to send information reliably in the presence of an adversary, who looks to detect whether the transmission took place or not. We consider covert communications over quasi-static block fading channels, where users suffer from channel uncertainty. We investigate the adversary Willie's optimal detection performance in two extreme cases, i.e., the case of perfect channel state information (CSI) and the case of channel distribution information (CDI) only. It is shown that in the large detection error regime, Willie's detection performances of these two cases are essentially indistinguishable, which implies that the quality of CSI does not help Willie in improving his detection performance. This result enables us to study the covert transmission design without the need to factor in the exact amount of channel uncertainty at Willie. We then obtain the optimal and suboptimal closed-form solution to the covert transmission design. Our result reveals fundamental difference in the design between the case of quasi-static fading channel and the previously studied case of non-fading AWGN channel.
