An Arbitrary Sampling and Receiving Method for Multi-modal Orbital Angular Momentum Vortex Waves

Abstract

The present invention proposes an arbitrary sampling and receiving method for multi-modal orbital angular momentum vortex waves, which is used to ensure that the receiving aperture of long-distance transmission is small and realize continuous-order modal values ​​in the case of obstacles in the space environment While receiving the vortex wave, the accuracy of the modal information of the multi-modal orbital angular momentum vortex wave is improved. The implementation steps are: determine the azimuth angle of each antenna unit; construct the field expression of the multi-modal orbital angular momentum vortex wave according to the sampling theorem to construct the energy amplitude vector c of the M modal vortex wave and sample and receive the N antenna units The coefficient matrix A between the multimodal vortex wave signal vector b; the sampling receiving device obtains the multimodal vortex wave signal vector b; obtains the ith modal vortex wave in the multimodal orbital angular momentum vortex wave energy range F i value. The invention realizes the flexible reception of the vortex wave of the continuous mode value, and improves the utilization rate of the orbital angular momentum.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for receiving orbital angular momentum vortex waves, in particular to an arbitrary sampling receiving method for multi-mode orbital angular momentum vortex waves limited by the receiving environment, which can be used for radio frequency and microwave band wireless communication system. Background technique [0002] With the wide application of wireless communication technology, the problem of channel congestion has become a difficult point in the research of current technology. The modal characteristics of orbital angular momentum (OAM) bring a new multiplexing method for information transmission, which is a great way to expand the channel. Capacity offers possibilities. Until 2007, the team of Professor B.Thide in Sweden successfully generated the orbital angular momentum vortex wave through the method of array antenna, and the field expression of the vor...

AI Technical Summary

Problems solved by technology

This method requires the receiving antenna units to be evenly distributed in the fan-shaped area of ​​1 / P (P is an integer), which reduces the receiving aperture of the antenna when the vortex wave is transmitted over a long distance, and the partial aperture sampling receiving method requires the received two vortex wave modes The state value l satisfies a certain interval, that is, the vortex beams with continuous low-order mode values ​​cannot communicate, which reduces the utilization rate of orbital angular momentum

The uniform distribution of receiving antennas in the full-aperture and partial-aperture sampling receiving methods may be affected by obstacles in space, which will affect the received vortex wave energy amplitude and cause the multi-modal orbital angular momentum vortex wave modal information to be inconsistent. precise

Images