PROJECT TITLE :
During this paper, we propose combined relay selection and cooperative beamforming schemes for physical layer security. Usually, high operational complexity is required for cooperative beamforming with multiple relays as a result of of the required data exchange and synchronization among the relays. On the other hand, whereas it is desirable to cut back the number of relays participating in cooperative beamforming because of the associated complexity downside, doing so could degrade the coding gain of cooperative beamforming. Hence, we tend to propose combined relay choice and cooperative beamforming schemes, where solely 2 of the obtainable relays are selected for beamforming and data transmission. The proposed schemes introduce a choice gain that partially compensates for the decrease in coding gain thanks to limiting the quantity of taking part relays to two. Both the cases where full and solely partial channel state data are on the market for relay choice and cooperative beamforming are considered. Analytical and simulation results for the proposed schemes show improved secrecy capacities compared to existing physical layer security schemes using cooperative relays.
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