电磁涡旋及其在无线通信中的应用

随着移动数据需求的飞速增长，频谱资源紧缺的问题已成为限制无线通信产业发展的瓶颈。电磁涡旋作为一项新的传输技术，引入轨道角动量这一新的复用维度，可以实现在同一频带同时传输多路信息，有望极大地提高通信系统的容量，有效解决频率资源短缺的问题。详细分析了电磁涡旋的结构和性质，概述了电磁涡旋的国内外研究进展，阐述了电磁涡旋的产生与接收方法及复用技术原理，指出了电磁涡旋面临的挑战与后续研究建议。

Electromagnetic vortex and its application in wireless communication

With the rapid growth in demand for the mobile data,the lack of spectrum resources has become a serious problem which restrains the development of wireless communication industry. As a new transmission technology,electromagnetic(EM) vortex beams,transmitted on the same frequency,can be used to send multi-path of information simultaneously since it utilizes the orbital angular momentum(OAM) as a new multiplexing dimension. It may not only improve the bandwidth efficiency and system capacity greatly,but also solve the problem of the shortage of frequency resources effectively. In this paper,the structures and characters of EM vortex are analyzed in detail. The domestric and abroad progress of EM vortex is systematically summarized.The ways to transmit and receive EM vortex and the principles of EM vortex in multiplexing are presented. Challenges in the application of EM vortex in wireless communication and suggestions for further research are pointed out.