Radio Vortex Wireless Communications With Non-Coaxial UCA Transceiver

TL;DR

This paper explores radio vortex wireless communications using non-coaxial UCAs, developing a mode-decomposition scheme and analyzing how non-coaxial angles affect channel performance, showing potential spectrum efficiency improvements.

Contribution

It introduces a novel channel model and mode-decomposition scheme for non-coaxial UCA transceivers in OAM-based radio vortex communications, expanding beyond aligned configurations.

Findings

Non-coaxial UCA transceivers can achieve higher spectrum efficiency in some cases.

The developed mode-decomposition scheme effectively analyzes non-coaxial UCA channels.

The impact of included angles on channel characteristics is significant and quantifiable.

Abstract

In the past decade, more and more researchers have concentrated on orbital-angular-momentum (OAM) based radio vortex wireless communications, which is expected to provide orthogonality among different OAM-modes. The uniform circular array (UCA) is considered as one promising antenna structure for OAM based radio vortex wireless communications. However, most studies regarding UCA focus on the scenario where the transmit and receive UCAs are aligned with each other. In this paper, we investigate the radio vortex wireless communications with non-coaxial UCA, i.e., the UCA transceivers are parallel but non-coaxial. We study the channel model and develop the mode-decomposition scheme to decompose the OAM-modes. Then, we discuss the impact of included angles on the channel model under non-coaxial scenario. Numerical results are presented to evaluate our developed scheme and show that the spectrum efficiency of the non-coaxial UCA transceiver in some cases is larger than that of the aligned UCA transceiver based radio vortex wireless communications.