arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2104.09084cs.ITmath.IT
收藏

具有非线性能量收集的MIMO WPT系统的最优传输策略

Optimal Transmit Strategy for MIMO WPT Systems With Non-linear Energy Harvesting

Nikita Shanin, Laura Cottatellucci, Robert Schober

摘要:

在本文中,我们研究了多输入多输出(MIMO)无线功率传输(WPT)系统,其中能量采集器(EH)节点配备了多个非线性整流天线。我们的最优发射策略的特征在于最大化的平均收获功率在EH的发射机的功率预算的约束下的发射符号向量的最优分布。我们表明,最佳的传输策略采用标量单位范数输入符号与任意相位和两个波束成形向量,这是确定为一个非凸优化问题的解决方案。为了解决这个问题,我们提出了一个基于二维网格搜索,半定松弛,逐次凸逼近的迭代算法。我们的仿真结果表明,所提出的MIMO WPT设计显着优于两个基线计划的基础上的线性EH模型和一个单一的波束成形矢量,分别。最后,我们表明,平均收获功率与EH节点处的整流天线的数量呈线性增长,并且对于大量的TX天线饱和。

英文摘要:

In this paper, we study multiple-input multiple-output (MIMO) wireless power transfer (WPT) systems, where the energy harvester (EH) node is equipped with multiple nonlinear rectennas. We characterize the optimal transmit strategy by the optimal distribution of the transmit symbol vector that maximizes the average harvested power at the EH subject to a constraint on the power budget of the transmitter. We show that the optimal transmit strategy employs scalar unit-norm input symbols with arbitrary phase and two beamforming vectors, which are determined as solutions of a non-convex optimization problem. To solve this problem, we propose an iterative algorithm based on a two-dimensional grid search, semidefinite relaxation, and successive convex approximation. Our simulation results reveal that the proposed MIMO WPT design significantly outperforms two baseline schemes based on a linear EH model and a single beamforming vector, respectively. Finally, we show that the average harvested power grows linearly with the number of rectennas at the EH node and saturates for a large number of TX antennas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑