Joint Secure Transceiver Design for Integrated NOMA Communication and Wireless‐Powered Over‐the‐Air Computation Networks

ABSTRACT

This letter investigates a joint secure transceiver design for an integrated non‐orthogonal multiple access (NOMA) communication and wireless‐powered over‐the‐air computation (AirComp) network, where communication security and computation accuracy must be simultaneously guaranteed under shared wireless resources. To protect NOMA transmissions against eavesdropping, a secrecy‐oriented optimisation problem is formulated to maximise the sum secrecy rate while satisfying the AirComp computational mean‐squared error constraint, sensor energy causality, and the quality‐of‐service requirements of all users. The proposed framework jointly optimises the communication and energy beamforming at the base station (BS), the computation beamforming at sensors and the aggregation beamforming at the BS. The resulting problem is highly non‐convex due to tightly coupled variables. To address this challenge, an efficient iterative algorithm integrating matrix fractional programming with a constrained concave‐convex procedure is developed. Simulation results verify that the proposed design achieves a more favourable trade‐off between communication security and computation accuracy compared with benchmark schemes.