Allocation of Power in Relay Networks for Secured Communication

Secured communications in the presence of eavesdropper node is grave for the successful operations in the wireless relay networks. In the proposed work, choose two hop wireless relay networks to enhance security against the eavesdropper node. This paper considers four node networks, they are one source, and three decode and forward relay, one destination and one eavesdropper node. To transmit the information from source to relay node, eavesdropper interrupt and try to capture that relay node messages. To prevent the eavesdropper interception, destination sends artificial jamming noise to the relay node. This jamming noise has the ability to jam the eavesdropper node. According to the channel state information present at the destination, the four types of jamming power allocation methods are introduced; (i) Fixed jamming power allocation, (ii) Rate optimal power allocation, (iii) Outage optimal power allocation, (iv) Statistical optimal power allocation method. The maximum achievable data rate at the destination is also estimated.