Index Modulation Embedded Mode Hopping for Anti-Jamming

TL;DR

This paper introduces an index modulation embedded mode-hopping scheme utilizing orbital angular momentum modes to enhance anti-jamming capabilities and spectrum efficiency in wireless communications with low computational complexity.

Contribution

It proposes a novel IM-MH scheme that activates multiple OAM modes for hopping, improving reliability and spectrum efficiency over traditional methods.

Findings

Achieves low ABER with perfect and imperfect CSI.

Significantly increases spectrum efficiency.

Reduces ABER by approximately 25% and 10% with proposed schemes.

Abstract

Due to the crowded spectrum, frequency hopping (FH) techniques are now very difficult to achieve efficient antijamming and increase spectrum efficiency (SE) for wireless communications. The emerging orbital angular momentum (OAM), which is a property describing the helical phase fronts of electromagnetic waves, offers the potential to improve reliability and increase SE in wireless communications. To achieve efficient anti-jamming and increase SE of wireless communications with slight computational complexity cost, in this paper we propose an index-modulation embedded mode-hopping (IM-MH) scheme, which simultaneously activates several OAM-modes for hopping along with additional index information and signal information transmission. We analyze the average bit error rates (ABERs) for our proposed IM-MH scheme with perfect channel state information (CSI) and imperfect CSI, respectively. We also propose the index-modulation embedded double-serial MH (IMDSMH) scheme, which randomly activates one OAM-mode as the serial second hop to transmit the hopping signals in the IM-MH scheme, to further decrease the ABER of wireless communications. Extensive numerical results demonstrate that our proposed schemes within a narrowband can achieve the low ABER and significantly increase the SE. Also, the ABERs of our proposed IM-MH and IM-DSMH schemes are around 25% and 10%, respectively, compared with that of the mode hopping scheme.