Abstract
In this paper, we study the influence of a smart jammer on the design of a three-node frequency hopping communication system using an amplify-and-forward relay. The jammer is smart that it senses the frequency and transmit powers used by the legitimate transmitters including the source node and the relay, and optimally adjusts the sensing time and the jamming power allocation to maximize the performance damage of the relay system. We jointly consider the time domain and the power domain to design a multi-domain anti-jamming strategy. To model the interaction between the legitimate transmitters and the jammer, we use Stackelberg game and let the legitimate transmitters act as the leader while the jammer act as the follower. Based on backward induction, a genetic algorithm based on exponential distribution algorithm is proposed to obtain the optimal frequency-hopping speed and the optimal transmit powers of the legitimate transmitters. Simulation results show that the proposed multi-domain strategy outperforms single-domain schemes and the multi-domain random scheme. Moreover, the optimal placement of the relay is also discussed through simulations.
Highlights
In 4G and 5G communication networks, wireless relay is an effective solution to extend the coverage and meet the requirement of high data rate
SIMULATION RESULTS AND DISCUSSION we first demonstrate the optimal parameters in time-domain and power-domain obtained by the genetic algorithm based on exponential distribution (GAED) algorithm
It can be seen that the optimal transmit power (P∗s, P∗r ) found in the GAED algorithm are consistent with the maximum value found by the traversal search
Summary
In 4G and 5G communication networks, wireless relay is an effective solution to extend the coverage and meet the requirement of high data rate. Due to the open characteristic of wireless channels, the information transmissions from the source node and the relay are exposed under the threat of jamming attack, which causes serious damage on the quality of communications [1]. Frequency hopping spread spectrum [2]–[4] is widely used in the wireless communication systems that require anti-jamming protection. Communication signals, and immediately injects jamming signals on the detected frequency band [5] with the minimum required power, poses a great challenge to the existing defence mechanisms. To deal with the smart jamming in wireless FH systems, an intuitive approach is to increase the frequency hopping rate or increase the transmission power. Y. Li et al.: Multi-Domain Anti-Jamming Strategy Using Stackelberg Game in Wireless Relay Networks being accurately detected and interfered, which will harm the legal transmission. The joint selection of optimal FH speed and transmission power for FH communications is an important issue to be solved
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