Physical Layer Security in Multi-Hop AF Relay Network Based on Compressed Sensing

In this letter, we consider secure communication of one source-destination pair with multi-hop amplify-and-forward relays. We utilize compressed sensing (CS) to guarantee the CS multi-hop network security. Different to the most existed works, we first demonstrate that the time slots during the whole transmission can be regarded as the measurement dimension in CS. Therefore, the physical layer security can be achieved by multi-hop cooperative wireless transmission whose equivalent channel matrix can be used as the secure measurement matrix. Increasing the number of hops will increase the secrecy rate. We also investigate the robustness of the CS multi-hop scheme in the presence of one eavesdropper.