基于单比特反馈的分布式多点协作微波输能方法

Single-Bit Feedback Algorithm Based Distributed Coordinated Multi-Points Microwave Power Transmission Method

无线传感器和移动电子设备的普及推动了无线输能技术的研究,并随着近年物联网技术的发展,无线节点大幅增加,无线输能有了更广泛的应用空间。微波输能作为一种有效的无线输能方式,具有能量传输距离远的优势,而利用在无线通信上被广泛应用的分布式多点协作技术,还可在遮挡环境下输能,并能提升输能效率。但是目前已有研究通过各节点检测相位以进行协作,输能节点成本较高,难以通过增加节点数量以提升效率。为此本文提出使用单比特反馈方法,免去了复数乘除法计算,只检测幅度实现协作,在输能效率小幅下降的代价下大幅降低了各节点的硬件成本。通过仿真得出在64个全向节点下能达近5%的输能效率;实验验证在七个输能节点下可获得15.6dB增益。本文提出的低成本方案使得通过增加发射节点来提升输能效率变得可行。

The wide application of wireless sensors and mobile electronic devices promotes the research of wireless power transmission(WPT),while the development of Internet of Things(IoT)and the increasing of wireless devices in recent years broaden the application of WPT.As an effective method of WPT,microwave power transmission(MPT)has the advantage that it can transmit power in a large distance.With the use of distributed coordinated multi-points(CoMP),which is widely used in wireless communications,power can be transmitted in shadows and the transmission efficiency is increased.However,the current research of CoMP-MPT achieves coordination by measuring phases of multi-points with expensive hardware,which is hard to increase efficiency by increasing number of points because of the cost.To solve this problem,a new method based on single bit feedback algorithm is proposed in this paper.The algorithm achieves coordination without complex multiplication but only amplitude feedback,so it reduces the cost of hardware obviously with little reducing of power transmission efficiency.Computer simulation results show that the transmission efficiency would achieve near 5%when 64 omnidirectional transmitters are equipped.Experimental results show that the power gain is 15.6 dB if seven coordinated transmitters are used.The proposed low-cost scheme makes it possible to equip large number of transmitters,which leads to the increasing of transmission efficiency.