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中文摘要：
在由一个源节点、中继节点、目的节点和窃听节点组成的两跳中继窃听信道模型中，假定各节点均具有能量收集能力，采用“储能一发送”模式工作，即先收集能量，然后再发送数据。中继节点采用放大转发方式，目的节点发送人工噪声协同干扰。首先分析得到目的端协同干扰方式下获得正的保密容量的条件；然后给出以最大化保密速率Rs为目标的吸收比例系数ρ和干扰功率分配因子α的迭代优化算法；最后对算法性能进行仿真。仿真结果表明，优化算法收敛速度快，能有效提高系统的保密传输速率。
英文摘要：
A two-hop relay-eavesdropper channel model with one transmitter, one relay, one receiver and one eavesdropper is considered, where the nodes harvest energy and the save-then-transmit protocol is em- ployed. That is, the nodes harvest energy first, which is then used to transmit the data. The relay is operated as an amplify-and-forward relay, and the destination sends an intended jamming noise to protect information, which is referred as cooperative jamming. First, the condition that ensures the promotion of secrecy capacity is derived. Second, an optimization algorithm to maximize secrecy rate Rs is given, which is based on the optimiza- tion of the energy saving time ratio ρ and the jamming power allocation scaling factor α. Simulation results show that the algorithm has a high convergence speed, and can effectively improve secrecy rate.
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