增强物理层安全的联合发射天线选择和人工噪声技术

针对未来多天线通信系统的安全问题，提出了一种增强无线物理层安全的传输策略。该策略基于发射天线的选择以及人工噪声，并采用Alamouti编码。它可以使发射机和接收机以较低的复杂度代价提高合法信道的分集增益，同时有效干扰窃听信道，使通信系统获得更高的安全容量。对系统安全容量、天线数量、以及信息信号与人工噪声之间的功率分配等问题进行了研究，仿真结果表明，该传输策略能够有效地增强物理层安全。 

Enhanced Physical-Layer Security through Joint Transmit Antenna Selection and Artificial Noise

In this paper, an enhanced physical layer security communication scheme is proposed for the multiple antenna systems. The scheme employing transmit antenna selection and artificial noise, also Alamouti coding, improved diversity gain in legitimate channel with low complexity in the transmitter and receiver, and at the same time efficiently jammed the wiretap channel. Consequently it can increase the system secrecy capacity. We analyze the system secrecy capacity and the impacts of the number of antennas and the power allocation between the information signal and artificial noise. Simulation results demonstrate that the proposed scheme can effectively enhance the physical layer security.