Energy Efficiency of Cooperative Jamming Strategies in Secure Wireless Networks
Energy efficient secure communication in wireless networks in the presence of eavesdroppers is considered. For a secure transmission to the destination, a set of intermediate "Jammer" nodes are chosen to generate artificial noise that confuses the eavesdropper. The authors consider two jamming strategies: beam-forming and cooperative diversity. Previous research has focused largely on cooperative beam-forming strategies, but they demonstrate a number of scenarios where a cooperative diversity strategy is desirable. This motivates approaches which selectively switch between the two strategies, from which significant energy savings can often be realized. In their simulations, energy savings of up to 40% are observed in the simulated networks.