In this study, the authors consider the user rate optimisation for wireless powered communication networks (WPCNs). To improve the user rate, a novel minimum mean square error (MMSE)-based transmission method is proposed for WPCNs. For maximising the user rate, a user rate optimisation problem with MMSE constraints in the uplink transmission is formulated, which is considered as a convex optimisation problem. Considering the uplink power allocation, downlink energy beamforming, and the time ratio between uplink and downlink durations, a novel Newton iterative algorithm is proposed to obtain the optimal solution of the optimisation problem. Furthermore, the computational complexity of the MMSE-based method is illustrated by theoretical analysis. Simulation results show that the MMSE-based method can effectively improve the user rate compared to the zero-forcing suboptimal method and time division multiple access-energy harvesting method. Moreover, simulation results also show that the experimental runtime tends to coincide with the theoretical runtime in the MMSE-based method.

中文翻译：

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基于mmse的无线通信网络传输方法

在这项研究中，作者考虑了无线通信网络（WPCN）的用户速率优化。为了提高用户速率，提出了一种新的基于最小均方误差（MMSE）的WPCN传输方法。为了最大化用户速率，提出了上行传输中具有MMSE约束的用户速率优化问题，该问题被认为是凸优化问题。考虑到上行功率分配，下行能量波束成形以及上行和下行持续时间之间的时间比，提出了一种新颖的牛顿迭代算法来获得优化问题的最优解。此外，通过理论分析说明了基于MMSE的方法的计算复杂性。仿真结果表明，与基于零强制的次优方法和时分多址能量收集方法相比，基于MMSE的方法可以有效提高用户率。此外，仿真结果还表明，在基于MMSE的方法中，实验运行时间倾向于与理论运行时间一致。