In this paper, we study a dual-hop wireless powered communication network (DH-WPCN), where the two-way communication between the users and the access point (AP) is assisted by a relay. Assuming a piece-wise linear energy harvesting (EH) model for the users and the relay, we investigate the problem of total throughput maximization for both amplify-and-forward (AF) and decode-and-forward (DF) relaying modes. To deal with the non-convexity of the throughput maximization problem, we apply the block coordinate descent (BCD) technique and alternately optimize different blocks of optimization variables until convergence is achieved. Numerical results demonstrate the substantial performance gain of the proposed scheme with piece-wise linear EH model as compared to the case with oversimplified linear EH model. This is due to the fact that our proposed scheme takes into consideration the saturation effect of practical EH circuits in optimizing the resource allocation.

中文翻译：

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具有实用能量收集模型的双向双跳WPCN

在本文中，我们研究了双跳无线供电通信网络 (DH-WPCN)，其中用户和接入点 (AP) 之间的双向通信由中继辅助。假设用户和中继采用分段线性能量收集 (EH) 模型，我们研究了放大转发 (AF) 和解码转发 (DF) 中继模式的总吞吐量最大化问题。为了处理吞吐量最大化问题的非凸性，我们应用块坐标下降 (BCD) 技术并交替优化不同的优化变量块，直到实现收敛。数值结果表明，与过度简化的线性 EH 模型的情况相比，采用分段线性 EH 模型的所提出方案的显着性能增益。