Jamming Modulation: Make Enemies Become Friends

This paper presents a novel active anti-jamming (AAJ) scheme for a jammed channel to enhance the communication between a transmitter node (TN) and receiver node (RN), where the TN actively exploits the jamming signal as a carrier to send messages. Specifically, the TN is equipped with a programmable-gain amplifier (PGA), which is capable of re-modulating the jamming signals for jamming modulation (JM). Under this setup, we first introduce an energy detector to extract the desired messages by distinguishing different energy levels of the received signals. Then, We investigate the channel capacity of the jammed channel enabled with the AAJ scheme. We also derive the semi-closed-forms of the channel capacity and the corresponding optimal input distribution for the binary input and continuous output channel. Finally, simulation results show that the proposed AAJ scheme allows the TN to communicate with the RN even under extremely strong and/or broadband jamming. Moreover, the channel capacity of the AAJ scheme outperforms that of the direct transmission (DT) when the jamming-to-noise ratio (JNR) at the RN is relatively high.