Physical layer network coding for secure cooperative relay networks

In this paper, we investigate secure communication in two-hop cooperative relay network with physical layer network coding (PNC). By sending a jamming signal from the destination and exploiting the PNC at the relay, the relay decodes the exclusive-OR (XOR) performed message of the source message and the jamming. This process acts as the encryption of the source message at the relay with a random jamming sequence which can be subtracted only at the destination, so that it prevents the eavesdropper from intercepting the message. We derive the outage probability of the secure scheme with PNC and compare the performance with the cooperative scheme without jamming.