Enhanced Index Modulation-Based Frequency Hopping: Resist Power-Correlated Reactive Jammer

Abstract

Reactive jammer has emerged as a relatively intelligent jamming with low energy cost and high jamming efficiency. Moreover, the jammer can obtain the power-correlated reactive jamming via the cooperation with a malicious user, which imposes a severe threat on the reliability of legitimate users. To solve this issue, this letter proposes an enhanced index modulation based frequency hopping spread spectrum (EIM-FHSS) scheme. Specifically, the strategy of power control in EIM-FHSS is provided where the main step of the strategy is formulated as a general optimization problem. Then we calculate a closed form solution for high signal to noise ratio (SNR), and propose a fast search algorithm for general case to obtain the approximate optimal power with low complexity. Simulation results show that EIM-FHSS can obtain enhanced anti-jamming performance as well as low-complexity compared with the benchmarks.