Rotatable Antenna Enabled Covert Communication
🤖 AI Summary
This work addresses the fundamental trade-off between covertness and achievable rate in wireless covert communication under multi-warden scenarios. To this end, it introduces— for the first time—a rotatable antenna array and jointly optimizes the beamforming vector and antenna rotation angle to maximize the covert rate of the legitimate user, subject to constraints on covertness, transmit power, and mechanical rotation limits. By exploiting spatial degrees of freedom, the proposed approach enhances covertness performance and employs an efficient alternating optimization framework that integrates second-order cone programming (SOCP) with successive convex approximation (SCA) to effectively solve the resulting non-convex problem. Simulation results demonstrate that the proposed scheme significantly outperforms existing benchmark methods in terms of covert communication performance.
Application Category
📝 Abstract
Unlike conventional fixed-antenna architectures, rotatable antenna (RA) has shown great potential in enhancing wireless communication performance by exploiting additional spatial degrees of freedom (DoFs) in a cost-effective manner. In this letter, we propose a novel RA-enabled covert communication system, where an RA array-based transmitter (Alice) sends covert information to a legitimate user (Bob) in the presence of multiple wardens (Willies). To maximize the covert rate, we optimize the transmit beamforming vector and the rotational angles of individual RAs, subject to the constraints on covertness, transmit power, and antenna rotational range. To address the non-convex formulated problem, we decompose it into two subproblems and propose an efficient alternating optimization (AO) algorithm to solve the two subproblems iteratively, where the second-order cone programming (SOCP) method and successive convex approximation (SCA) approach are applied separately. Simulation results demonstrate that the proposed RA-enabled covert communication system can provide significantly superior covertness performance to other benchmark schemes.
Problem
Research questions and friction points this paper is trying to address.
covert communication
rotatable antenna
spatial degrees of freedom
beamforming
covertness
Innovation
Methods, ideas, or system contributions that make the work stand out.
Rotatable Antenna
Covert Communication
Alternating Optimization
Spatial Degrees of Freedom
Beamforming Optimization
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