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针对模拟网络编码系统(Analog Network Coding,ANC),提出联合天线选择与人工噪声(Antenna Selection and Artificial Noise,ASAN)的物理层安全传输方案。在ANC系统的广播阶段,中继结点从接收天线集合中优选出部分天线子集;基于优选天线子集,从联合等效信道矩阵中推导出波束成形矩阵与人工噪声向量。针对ASAN技术方案,提出了适合不同场景的天线选择方案并进行仿真分析。仿真结果表明:当Relay结点天线数为3时,相比于经典的波束成形方案,ASAN方案表现出的性能增益约为2.5d B;当天线数目配置为6时,性能增益约为3d B。特别地,联合优选准则与简化的单向选择准则具有接近的性能曲线,而单向选择准则算法的复杂度可减半。
Aiming at the Analog Network Coding (ANC), a physical layer secure transmission scheme combining Antenna Selection and Artificial Noise (ASAN) is proposed. In the broadcast phase of ANC system, the relay node selects a subset of antenna subsets from the set of receive antennas. Based on the preferred antenna subsets, the beamforming matrix and the artificial noise vector are derived from the joint equivalent channel matrix. According to the ASAN technical scheme, the antenna selection scheme suitable for different scenarios is proposed and simulated. Simulation results show that when the number of relay nodes is 3, the performance gain of ASAN scheme is about 2.5d B compared with that of classical beamforming scheme. When the number of antennas is 6, the performance gain is about 3dB . In particular, the joint optimization criterion has a close performance curve with the simplified one-way selection criterion, while the complexity of the one-way selection criterion algorithm can be halved.