Mode Hopping with OAM-Based Index Modulation

TL;DR

This paper introduces an OAM-based index modulation scheme for mode hopping in radio vortex wireless communications, significantly improving spectrum efficiency while maintaining reliability, by activating multiple OAM-modes for hopping.

Contribution

It proposes a novel mode hopping scheme using index modulation with multiple OAM-modes, enhancing spectrum efficiency in radio vortex wireless systems.

Findings

Achieves higher spectrum efficiency compared to traditional single-mode hopping.

Derives bounds for achievable spectrum efficiencies.

Identifies optimal OAM-modes for maximum spectrum efficiency.

Abstract

Orbital angular momentum (OAM) based mode hopping (MH) scheme is expected to be a potential anti-jamming technology in radio vortex wireless communications. However, it only uses one OAM-mode for hopping, thus resulting in low spectrum efficiency (SE). Index modulation offers a trade-off balance between the SE and performance reliability. In this paper, we propose an MH with OAM-based index modulation scheme, where several OAM-modes are activated for hopping, to achieve high SE at a given bit error rate in radio vortex wireless communications. Based on the proposed scheme, we derive the upper bound and lower bound of achievable SEs. Furthermore, in order to take advantage of index information, we derive the optimal hopped OAM-modes to achieve the maximum SE. Numerical results show that our proposed MH with index modulation scheme can achieve high SE while satisfying a certain reliability of radio vortex wireless communications.