# UAV-Assisted Covert Communication with Dual-Mode Stochastic Jamming

## TL;DR

This paper introduces a dual-UAV system for covert communication, using one UAV to transmit and another to generate jamming, improving secrecy and reducing detection.

## Contribution

The novel dual-mode stochastic jamming scheme and the joint optimization algorithm for maximizing average covert rate in UAV-assisted communication.

## Key findings

- Dual-mode jamming significantly boosts the average covert rate (ACR) in UAV-assisted communication.
- The proposed algorithm effectively optimizes UAV parameters to enhance covert communication performance.
- Numerical results confirm the efficacy of the dual-UAV scheme in reducing detection probability.

## Abstract

Covert communication assisted by unmanned aerial vehicles (UAVs) can achieve a low detection probability in complex environments through auxiliary strategies, including dynamic trajectory planning and power management, etc. This paper proposes a dual-UAV scheme, where one UAV transmits covert information while the other one generates stochastic jamming to disrupt the eavesdropper and reduce the probability of detection. We propose a dual-mode jamming scheme which can efficiently enhance the average covert rate (ACR). A joint optimization of the dual UAVs’ flight speeds, accelerations, transmit power, and trajectories is conducted to achieve the maximum ACR. Given the high complexity and non-convexity, we develop a dedicated algorithm to solve it. To be specific, the optimization is decomposed into three sub-problems, and we transform them into tractable convex forms using successive convex approximation (SCA). Numerical results verify the efficacy of dual-mode jamming in boosting ACR and confirm the effectiveness of this algorithm in enhancing CC performance.