Time-Frequency Robust Cooperative Jamming Cancellation for Physical Security in Tactical Networks

In tactical networks, cooperative jamming has the potential to limit enemy use of the electromagnetic spectrum from the physical layer and shield its own secret signals from eavesdropping. The unauthorized equipment is confused by the cooperative jamming actively released by our forces, but inevitably, the cooperative jamming will also propagate to the authorized receiver. In order to receive the desired signal correctly for the authorized receiver, the cooperative jamming should be reconstructed and cancelled. In this paper, we formulate a time-frequency robust cooperative jamming cancellation (CJC) architecture to reconstruct and cancel cooperative jamming received by authorized receivers, considering the existence of multi-path delay, mismatch of oscillator output frequency, and Doppler frequency shift in the transmission process. Simulation results show that the proposed architecture can improve the CJC performance, has a strong tolerance for incomplete time-frequency alignment, and can obtain better performance for large time delay and frequency offset by increasing the corresponding expansion order in the model.