Sensing-Assisted Orbital-Angular-Momentum Communications for Anti-Jamming

Wireless communications are vulnerable to jamming attacks due to their open and broadcast nature. Conventional frequency hopping techniques have poor performance under co-frequency jamming attacks, so efficient anti-jamming techniques are required to significantly improve the performance of wireless communications. In this paper, we propose the sensing-assisted orbital-angular-momentum (OAM) antijamming communications scheme, where the transmitter can simultaneously receive the jamming signals to estimate the jammer's position and send the useful signals carried by different orthogonal modes to the receiver, to significantly increase the spectrum efficiency (SE) of wireless communications under hostile jamming. To obtain the jammer's position, we develop the joint enhanced multiple signal classification and received signal strength scheme. Then, we design the mode selection scheme with optimal power allocation for anti-jamming based on the estimated jamming channel state information and the orthogonality of modes. Numerical results have shown that our proposed scheme can significantly resist hostile jamming.