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In this paper, we examine the physical layer security for cooperativewireless networks with multiple intermediate nodes, where thedecode-and-forward (DF) protocol is considered. We propose a new joint relayand jammer selection (JRJS) scheme for protecting wireless communicationsagainst eavesdropping, where an intermediate node is selected as the relay forthe sake of forwarding the source signal to the destination and meanwhile, theremaining intermediate nodes are employed to act as friendly jammers whichbroadcast the artificial noise for disturbing the eavesdropper. We furtherinvestigate the power allocation among the source, relay and friendly jammersfor maximizing the secrecy rate of proposed JRJS scheme and derive aclosed-form sub-optimal solution. Specificially, all the intermediate nodeswhich successfully decode the source signal are considered as relay candidates.For each candidate, we derive the sub-optimal closed-form power allocationsolution and obtain the secrecy rate result of the corresponding JRJS scheme.Then, the candidate which is capable of achieving the highest secrecy rate isselected as the relay. Two assumptions about the channel state information(CSI), namely the full CSI (FCSI) and partial CSI (PCSI), are considered.Simulation results show that the proposed JRJS scheme outperforms theconventional pure relay selection, pure jamming and GSVD based beamformingschemes in terms of secrecy rate. Additionally, the proposed FCSI based powerallocation (FCSI-PA) and PCSI based power allocation (PCSI-PA) schemes bothachieve higher secrecy rates than the equal power allocation (EPA) scheme.

Power-Constrained Secrecy Rate Maximization for Joint Relay and Jammer Selection Assisted Wireless Networks