Circular array rotation fractal nested structure-based high-order vortex electromagnetic wave generation method, separating method and devices

Abstract

The invention discloses a uniform circular array (UCA) rotation fractal nested structure-based high-order vortex electromagnetic wave antenna array structure, namely, a UCAn non-intersecting rotation nested structure; M UCAn arrays are rotated unidirectionally and then are uniformly spaced on the circumference of a circle of which the radius is r2, wherein n is equal to 0,1, ... N-1, so that the UCAn non-intersecting rotation nested structure can be formed; and the minimum value of the interval of adjacent UCAn arrays is not larger than lambda / 2. According to a high-order vortex electromagnetic wave generation method provided by the invention, the independent multimodal signals of UCAn are modulated to vortex waves of a certain modality generated by UCAs arrayed as the UCAn. According to a high-order vortex electromagnetic wave separating method, based on the antenna array element layout structure of the invention, the N-point space orthogonal transformation is carried out on array element responses with the same serial number from the UCAn, so that UCAn independent vortex signals can be obtained through demodulation; and M-point space orthogonal transformation is carried out on the UCAn independent vortex signals, so that modulated information can be separated out. The invention also discloses an implementation device of the uniform circular array (UCA) rotation fractal nested structure-based high-order vortex electromagnetic wave generation method, and an implementation device of uniform circular array rotation fractal nested structure-based high-order vortex electromagnetic wave receiving and separation.

Description

Technical field [0001] The invention relates to a method and device for generating and receiving and separating high-order vortex electromagnetic waves, and belongs to the technical fields of communication signal processing technology and radar signal processing technology. Background technique [0002] For communication technicians, finding new ways to increase the channel capacity of the system without increasing the bandwidth is an eternal theme. At present, the channel capacity enhancement technology of conventional wireless communication systems has been quite mature. For this reason, people have turned their attention to the field of non-traditional electromagnetic waves in order to find technological breakthroughs. According to classical electrodynamics theory, vortex electromagnetic waves of the same frequency and different modes can share the channel at the same time. In 2011, a team of Bo Thidé and his Italian colleagues demonstrated the simultaneous transmission of vor...

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Problems solved by technology

[0004] According to current literature reports: the more available modes of vortex electromagnetic waves in a communication system, the more obvious the capacity increase effect of the system, and correspondingly, the larger the physical size of the receiving / transmitting antenna of the system is required, which is not conducive to the movement and communication of the communication system. Therefore, it is of theoretical and practical significance to study the technology of generating high-order vortex electromagnetic waves with smaller physical size antennas. At present, there are very few reports on the generation and reception separation methods of high-order multi-mode vortex electromagnetic waves in the field of wireless communication.

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