Energy-Efficient Wireless Powered Secure Transmission with Cooperative Jamming for Public Transportation
This work addresses physical security for public transportation networks, but it is incremental as it builds on existing cooperative jamming and energy harvesting techniques.
The paper tackles secure wireless transmission in public transportation by combining wireless power transfer and cooperative jamming, proposing schemes that optimize beamforming and artificial noise to maximize secrecy rate or minimize transmit power, with simulation results showing significant performance improvements over existing methods.
In this paper, wireless power transfer and cooperative jamming (CJ) are combined to enhance physical security in public transportation networks. First, a new secure system model with both fixed and mobile jammers is proposed to guarantee secrecy in the worst-case scenario. All jammers are endowed with energy harvesting (EH) capability. Following this, two CJ based schemes, namely B-CJ-SRM and B-CJ-TPM, are proposed, where SRM and TPM are short for secrecy rate maximization and transmit power minimization, respectively. They respectively maximize the secrecy rate (SR) with transmit power constraint and minimize the transmit power of the BS with SR constraint, by optimizing beamforming vector and artificial noise covariance matrix. To further reduce the complexity of our proposed optimal schemes, their low-complexity (LC) versions, called LC-B-CJ-SRM and LC-B-CJ-TPM are developed. Simulation results show that our proposed schemes, B-CJ-SRM and B-CJ-TPM, achieve significant SR performance improvement over existing zero-forcing and QoSD methods. Additionally, the SR performance of the proposed LC schemes are close to those of their original versions.