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This paper considers grid formation of an unmanned aerial vehicle (UAV) swarmfor maximizing the secrecy rate in the presence of an unknown eavesdropper. Inparticular, the UAV swarm performs coordinated beamforming onto the null spaceof the legitimate channel to jam the eavesdropper located at an unknownlocation. By nulling the channel between the legitimate receiver and the UAVswarm, we obtain an optimal trajectory and jamming power allocation for eachUAV enabling wideband single ray beamforming to improve the secrecy rate.Results obtained demonstrate the effectiveness of the proposed UAV-aidedjamming scheme as well as the optimal number of UAVs in the swarm necessary toobserve a saturation effect in the secrecy rate. We also show the optimalradius of the unknown but constrained location of the eavesdropper.

Gridded UAV Swarm for Secrecy Rate Maximization with Unknown Eavesdropper