Institute of Electrical & Electronic Engineers
In this paper, the authors explore the physical-layer security in cooperative wireless networks with multiple relays where both Amplify-and-Forward (AF) and Decode-and-Forward (DF) protocols are considered. They propose the AF and DF based optimal relay selection (i.e., AFbORS and DFbORS) schemes to improve the wireless security against eavesdropping attack. For the purpose of comparison, they examine the traditional AFbORS and DFbORS schemes, denoted by T-AFbORS and TDFbORS, respectively. They also investigate a so-called Multiple Relay Combining (MRC) framework and present the traditional AF and DF based MRC schemes, called T-AFbMRC and TDFbMRC, where multiple relays participate in forwarding the source signal to destination which then combines its received signals from the multiple relays.