An Efficient Algorithm Based on Interference Cancellation Against Reactive Jammer

Abstract

Jamming attack is a serious threat to wireless communications. Reactive jammer is one of the most power-efficient jammers, which can listen for activities on channel and jam receivers when it detects communications. But to the best of our knowledge, there is no existing research of defense scheme focused on sustaining the multi-user and multi-antenna communications under reactive jamming attack. In this paper, we propose iterative estimation algorithm and interference cancellation algorithm to maintain the multiuser and multi-antenna orthogonal frequency-division multiplexing (OFDM) communications under reactive jamming attack. The iterative estimation algorithm means inserting some pilots in frames of the transmitted signals to estimate the channel matrixes. Furthermore, in order to remove interference, the received signals are projected onto the orthogonal subspace of the jamming signals by using the interference cancellation algorithm. Finally, the simulation results prove that the multi-user and multi-antenna OFDM communications are nearly throttled by jamming attack and our defense mechanisms can effectively turn it into operational scenario with considerable performance under reactive jamming attack.