Orbital-angular-momentum based mode-hopping: A novel anti-jamming technique

Abstract

Frequency hopping (FH) scheme has been widely used as a powerful technique for anti-jamming in wireless communications. However, as the wireless spectrum becoming more and more crowded, it is very difficult to achieve efficient anti-jamming results with FH schemes. Orbital angular momentum (OAM), which provides the new angular/mode dimension for wireless communications, offers an intriguing way for anti-jamming. In this paper, we propose the mode hopping (MH) scheme to utilize the orthogonality of OAM modes for anti-jamming in wireless communications. In particular, we de-hop OAM mode and decompose OAM signal to recover the transmit signal. Then, we employ equal gain combining (EGC) diversity reception to increase the received signal-to-noise ratio (SNR). We also derive the closed-form expressions of bit error rate (BER) for single user and multiple users scenarios, respectively, with our developed MH scheme. The numerical results are presented to show that our developed MH scheme can achieve the same anti-jamming results within the narrow frequency band as compared with the conventional wideband FH schemes. Furthermore, our developed MH scheme can be jointly used with the conventional wideband FH schemes to further decrease the BER for anti-jamming in wireless communications.