Research On Novel Multiplexed Com-Munication Based On Radio Electro-Magnetic Vortex

The fast-developing wireless communication technology definitely improves people's work efficiency and life quality,and it is also a necessary basis for the continuous development of the information-driven society.As one of many information multiplexing methods,spatial division multiplexing has obtained lots of interest and development due to its capability to provide the communication system high data rates without increasing the spectrum utilization.Being a spe-cial candidate of spatial division multiplexing,electromagnetic vortex communication based on orbital angular momentum(OAM)offers a rotation degree of freedom,largely improving spectral efficiency of the communication systems,and has become hot in electromagnetics and communi-cations area.In this thesis,three main research results about radio electromagnetic vortex communication are demonstrated as follows:Firstly,to solve the difficulty of multiplexing multiple radio elec-tromagnetic vortex modes,a four-OAM-mode antenna based on stacked traveling-wave ring-slot resonators was designed and it operated at 10 GHz.Then,the antenna was fabricated with the performances experimentally measured afterwards.Secondly,adopting a pair of four-OAM-mode antennas,a mode division multiplexing(MDM)communication link operating at 10 GHz was es-tablished.Experimental results show a Gbit/s scale wireless transmission with the communication distance being 10 meters.The experiment proves that radio electromagnetic vortex communica-tion can bring a vast reduction in receiver complexity without capacity penalty compared with the conventional multiple-in-multiple-out(MIMO)solution.Thirdly,to circumvent the problem that traditional whole circle receiving scheme would make the receiving antenna aperture unbearably big as the transmission distance increases,a compact receiving scheme,namely partial arc sam-pling receiving(PASR),was proposed based on the selection of a set of orthogonal OAM modes.All the theoretical,simulating,and experimental work were performed to verify its feasibility.This thesis gives a exhausitive discussion about radio electromagnetic vortex communication from the transmitter end,to the wireless link,and to the receiver end,and the challenges of elec-tromagnetic vortex communications and potential solutions to these problems are also explored.All the work done promotes the development of electromagnetic vortex communications.Finally,future development of radio electromagnetic vortex communication is prospected.