An approach for generating and detecting the signals with the given orbital angular momentum for wireless communication systems

Abstract

The paper is devoted to the development of methods for increasing the efficiency of wireless communication channels via usage of multiplexing by the orbital angular momentum (OAM), which allows to form an additional basis of orthogonal functions for the simultaneous independent transmission of several signals. In particular, the generation process involves the formation of a beam using an antenna array radiating in the 77-78.5 GHz range, the design of which allows to form various orders of the OAM signals without restructuring. The important points in the design process were ensuring the minimum divergence of the beam during the propagation and obtaining the maximum gain. Regarding receiving, a solution was proposed for detecting an OAM signal in case of misalignment between transmitting and receiving antennas. An antenna array consisting of two perpendicular dipoles has been proposed as a receiving device, which allows receiving the OAM signal from any direction. An important point of detection is the preservation of information about the phase of the received signal. The results of calculations and simulation of the transmission and reception in the range of 77-78.5 GHz are shown.