The short packet covert communication using a shared-aperture jammer assisted Time-Modulated Array(TMA)is investigated for the first time in this paper.Firstly,a TMA architecture for shared-aperture jammer is proposed and an optimization method is introduced that maximizes the gain of the target direction while forming interference in non-target directions.Based on this model,closed-form expressions for the covertness constraint and covert throughput are derived.Furthermore,the transmission power and blocklength are optimized to maximize the covert throughput.Simulation results show that there exists an optimum blocklength that maximizes the covert throughput,and the proposed scheme outperforms the benchmark scheme in terms of covert communication performance.
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