Date Added: May 2010
In this paper, the authors investigate cooperative jamming schemes for the transmission of confidential messages in ad hoc networks. By letting mobile units (the helpers) in the vicinity of a legitimate receiver send out jamming signals while a transmitter communicates with the receiver, an environment that is hostile to any eavesdroppers can be established. Meanwhile, the jamming signals are designed in an intelligent way such that the interference that the legitimate receiver experiences is kept low. Two particular approaches are considered, namely, Uncoordinated Cooperative Jamming (UCJ) and Coordinated Cooperative Jamming (CCJ). For both approaches, they present simulation results of the secrecy rate with respect to the node density of the network, the area the helpers occupy, and the number of transmit/receive antennas.