Joint Packet Length and Power Optimization for Covert Short-Packet D2D Communications

This paper proposes a joint optimization mechanism for packet length and power in the scenario of covert short D2D communication, so as to effectively improve communication performance between pairs subject constraint. Specifically, we construct short-packet model assisted by further propose notion effective throughput (ECT) quantitatively characterize trade-off covertness reliability IoT state monitoring information transmission. Secondly, constructed scenario, analyze detection error probability warden clarify that existing equal transmission pilot data signals can minimize warden. However, this strategy is achieved compromising system, which means ECT pair may not be optimal. Thirdly, aim maximize problem power, length. Furthermore, algorithm based on 2D search adopted obtain optimal solution established problem. Simulation results demonstrated better than scheme premise ensuring covertness.