一种全双工认知中继网络中实现能量高效的安全传输方法

摘要

在“绿色”安全通信背景下,提出了一种保证同时同频全双工认知中继网络物理层安全、不影响主用户性能且能量高效的中继簇功率分配方案,该网络包含两个认知源节点、多个认知中继节点、多个主用户节点以及多个主用户窃听节点.在考虑了自干扰消除率以及中继转发信息的公平性的基础上,分别针对中继节点选择放大转发与译码转发策略的情形,设计协作波束成形向量及人工噪声矩阵,并通过一种结合半定松弛技术的爬山算法来获取最优解.仿真结果与理论分析表明了方案的有效性与合理性,同时表明选择放大转发策略能够获取更高的总能量效率.%Under the "green" and secure communication background,we studied the co-time co-frequency full-duplex cognitive relay networks consisting of two secondary source nodes,multiple cognitive relay nodes,multiple primary nodes and multiple primary eavesdroppers.To improve the total energy efficiency on the premise of ensuring the physical-layer security and the primary node's performance whether the selection relay protocol is the amplify-and-forward or decode-and-forward,we proposed the power allocation schemes to obtain a cooperative beamforming coefficient and an artificial noise matrix after taking both self-cancellation and forwarding fairness into consideration.It is mainly optimized by the "hill climbing" algorithm that combines the semidefinite relaxation (SDR) technology.Simulation results and theoretical analysis show the effectiveness and rationality of our scheme.Moreover,the choice of amplify-and-forward relay protocol contributes to the higher total energy efficiency.