Institute of Electrical & Electronic Engineers
Traditional high layer encryption-based method can hardly be applied in certain circumstances, e.g., Wireless Local Area Network (WLAN) or Ad hoc networks. Due to the fact that users' random accessing and leaving are difficult to predict in WLAN scenario, establishing an appropriate high layer protocol is not an easy task. In this paper, the authors study relay-aided networks with presence of single eavesdropper. They provide joint beamforming design of the source and relay that can minimize the overall power consumption while satisfying their predefined Quality-of-Service (QoS) requirements. Additionally, they investigate the case that the channel between relay and eavesdropper suffers from channel uncertainty. Finally, simulation results are provided to verify the effectiveness of their algorithm.