Secure Transceiver Design and Power Control for Over-the-Air Computation Networks

This letter investigates the physical layer security (PLS) for over-the-air computation (AirComp) networks. We propose a self-protection scheme to safeguard AirComp networks against eavesdropping using a full-duplex fusion center (FC), which transmits jamming noise to degrade the eavesdropper's links while receiving signals. To guarantee the secure computation of the FC, we jointly optimize the power control of senors and the transceiver of the FC to minimize the computation mean square error (CMSE) of the FC while setting the CMSE of the eavesdropper to be greater than a specific threshold. The formulated problem is nonconvex due to coupling variables, thus it is challenging to solve. We propose an alternating difference-of-convex (DC)-based algorithm to deal with it. Simulation results are provided to verify the effectiveness of our proposed scheme.