基于传输模式选择的混合Microwave/mmWave A2G系统中的隐蔽通信
Covert Communication in Hybrid Microwave/mmWave A2G Systems with Transmission Mode Selection
摘要：
研究了空对地（A2 G）系统中的隐蔽通信问题，其中无人机（Alice）可以采用全向微波（OM）或定向毫米波（DM）传输方式向地面用户（Bob）传输隐蔽数据，同时遭受敌方（Willie）的探测。对于OM和DM模式，我们首先进行理论分析，以揭示传输速率/传输功率和基本的隐蔽性能指标检测错误概率（DEP），有效的隐蔽率（ECR），和隐蔽香农容量（CSC）之间的内在关系。为了便于在Alice处进行传输模式选择，本文研究了OM和DM模式下ECR/CSC最大化的传输速率和发射功率优化问题，并进一步提出了一种混合OM/DM传输模式，该模式允许无人机在OM和DM模式之间进行自适应选择，以实现无人机在给定位置处的最大ECR和CSC。最后，通过大量的数值计算，分析了A2 G系统在不同传输模式下的隐蔽性能，并证明了OM/DM混合传输模式的隐蔽性能优于OM或DM模式。
英文摘要：
This paper investigates the covert communication in an air-to-ground (A2G) system, where a UAV (Alice) can adopt the omnidirectional microwave (OM) or directional mmWave (DM) transmission mode to transmit covert data to a ground user (Bob) while suffering from the detection of an adversary (Willie). For both the OM and DM modes, we first conduct theoretical analysis to reveal the inherent relationship between the transmit rate/transmit power and basic covert performance metrics in terms of detection error probability (DEP), effective covert rate (ECR), and covert Shannon capacity (CSC). To facilitate the transmission mode selection at Alice, we then explore the optimization of transmit rate and transmit power for ECR/CSC maximization under the OM and DM modes, and further propose a hybrid OM/DM transmission mode which allows the UAV to adaptively select between the OM and DM modes to achieve the maximum ECR and CSC at a given location of UAV. Finally, extensive numerical results are provided to illustrate the covert performances of the concerned A2G system under different transmission modes, and demonstrate that the hybrid OM/DM transmission mode outperforms the pure OM or DM mode in terms of covert performance.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
