Capacity of a Radio Vortex Communication System Using a Partial Angular Aperture Receiving Scheme under the Horizontal Non-Kolmogorov Model.

Qian Ma,Hengkai Zhao

doi:10.3390/s21051778

Abstract

A partial receiving scheme based on limited angular aperture multi-beam receiving and demultiplexing can solve the difficulty caused by the divergence of the vortex beam in the conventional whole beam receiving scheme and realize the long-distance transmission of the vortex wave. The propagation of the radio vortex beam in atmospheric turbulence is of significant importance in theoretical study and practical applications. In this paper, the influence of atmospheric turbulence on the performance of a radio vortex (RV) communication system based on a partial angular aperture receiving (PAAR) scheme under the horizontal non-Kolmogorov channel model is studied. The spiral spectrum of the PAAR scheme and the channel capacity of the RV communication system using the PAAR scheme are derived. Simulation results demonstrate that the selected transmission frequency range has a great influence on the RV communication system based on the PAAR scheme, and the choice of the orbital angular momentum (OAM) mode number L has an influence on the propagation distance. The capacity of RV communication systems based on the PAAR scheme increases with the increase of the transmission frequency in the selected transmission frequency range of 10 GHz–60 GHz. When the number of orbital angular momentum (OAM) modes L is small, we can improve the signal-to-noise ratio (SNR) to obtain a larger capacity of the RV communication system based on the PAAR scheme over a longer propagation distance.

Highlights

Orbital angular momentum (OAM) has attracted much interest due to its intrinsic physical properties and has been extensively studied in the field of wireless communications [1,2,3]
We analyze the influence of atmospheric turbulence on the radio vortex (RV) communication system using the partial angular aperture receiving (PAAR) scheme in the horizontal non-Kolmogorov turbulence model and discuss factors affecting the channel capacity, including non-Kolmogorov turbuen2, transmission frequency f, propagation lence parameter α, the signal-to-noise ratio (SNR), structure constant C
We analyze the influence of non-Kolmogorov turbulence parameters α on the channel capacity based on the PAAR scheme

Summary

Introduction

Orbital angular momentum (OAM) has attracted much interest due to its intrinsic physical properties and has been extensively studied in the field of wireless communications [1,2,3]. An improved receiving scheme called partial aperture sampling receiving (PASR) was proposed in [6], whose simulated results give a helpful guide on the manipulation of practical OAM-based wireless communication systems. We study the RV communication system using the partial aperture receiving scheme in horizontal non-Kolmogorov turbulence (the differences between the two turbulence models are detailed in Appendix A). The capacity model of the RV communication system using the partial aperture receiving scheme based on the horizontal non-Kolmogorov turbulence model is proposed. We chose the scheme of [5] to study the influence of atmospheric turbulence on the RV communication system using the partial aperture receiving scheme in the horizontal non-Kolmogorov turbulence model.

System Model and Theoretical Principle

Numerical Results

Conclusions