中文摘要：

考虑由一个源节点、两个目标节点组成的单源双宿两跳级联网络模型：中间节点是目标节点，除了接收、处理、分离自己所需消息，同时又作为中继节点，采用解码转发方式将其他信息转发给下一个目标节点。网络采用时分双工模式进行传输，发送端和接收端使用的频率相同。利用割集理论寻找该网络的容量外界，确定两跳的最优时间分配系数，并证明其可实现性，最后进行分析验证。

英文摘要：

A two-hop cascaded network with one source node and two sink nodes is considered in this paper. The middle node is not only the target to receive, process, and separate its own messages, but also as the relay node, transmit other messages to the next sink node by decode-and-forward relay strategy. The network operates in TDD mode where transmit and receive fre- quencies are the same. We derive the cut-bound of the network to find the optimal time distribution coefficient, and its achievablity is proved. Finally the results are analyzed and verified.