Anti-jamming Communication System Research Articles

Intelligent Spectrum Anti-Jamming With Cognitive Software-Defined Architecture

Malicious jamming in congested, contested, and constrained wireless environments has stimulated the demand of jamming-resistant communications. Nevertheless, classical anti-jamming techniques suffer from not only an extremely low data rate but also the risk of being interfered by the recently developed high-power jammers. As a promising solution, dynamic spectrum access (DSA) with software-defined platforms and cognitive functionality has been conceptualized, while systematic design remains an open issue. To this end, in this article, we propose a cognitive software-defined network (CSDN) architecture. Based on this, spectrum semantic extraction is developed to remove irrelevant spectrum features, such that learning a frequency preconfiguration policy (for DSA) can directly utilize the spectrum occupancy information. In order to learn the policy online, we propose a novel kernel-based distributed actor-critic algorithm, where the kernel method and online feature admission are exploited to make policy learning more adaptive. Numerical results show that semantics-driven reinforcement learning (RL) makes policy learning more efficient and accurate. Moreover, the proposed RL outperforms various baseline algorithms in terms of the strength in adapting to dynamic jamming patterns as well as the convergence speed of policy learning. Finally, a testbed is prototyped to validate the CSDN-based intelligent spectrum anti-jamming communication system.

Covert Anti-Jamming Communication Based on Gaussian Coded Modulation

In several wireless communication systems, robustness against jammers and covertness against eavesdroppers are required simultaneously. In this paper, we propose a novel covert anti-jamming communication system. The properties of both anti-jamming and covertness are achieved through the Gaussian-coded time-frequency modulation scheme. We propose two receiver algorithms based on the sparse signal recovery framework. The receiver algorithms estimate and remove the jamming signal from the received signal. In addition, it is difficult to distinguish the proposed signal from the actual Gaussian noise in both the time and frequency domains. We compare the covertness of the proposed communication system with that of a conventional digital modulation system in terms of the probability of detection. We numerically evaluated the bit error rate of the proposed system to demonstrate its anti-jamming performance.

An Anti-Jamming Hierarchical Optimization Approach in Relay Communication System via Stackelberg Game

In this paper, we study joint relay selection and the power control optimization problem in an anti-jamming relay communication system. Considering the hierarchical competitive relationship between a user and jammer, we formulate the anti-jamming problem as a Stackelberg game. From the perspective of game, the user selects relay and power strategy firstly which acts as the leader, while the jammer chooses power strategy then that acts as follower. Moreover, we prove the existence of Stackelberg equilibrium. Based on the Q-learning algorithm and multi-armed bandit method, a hierarchical joint optimization algorithm is proposed. Simulation results show the user’s strategy selection probability and the jammer’s regret. We compare the user’s and jammer’s utility under the proposed algorithm with a random selection algorithm to verify the algorithm’s superiority. Moreover, the influence of feedback error and eavesdropping error on utility is analyzed.

Wireless Communications under Broadband Reactive Jamming Attacks

A reactive jammer jams wireless channels only when target devices are transmitting; Compared to constant jamming, reactive jamming is harder to track and compensate against [2] , [38] . Frequency hopping spread spectrum (FHSS) and direct sequence spread spectrum (DSSS) have been widely used as countermeasures against jamming attacks. However, both will fail if the jammer jams all frequency channels or has high transmit power. In this paper, we propose an anti-jamming communication system that allows communication in the presence of a broadband and high power reactive jammer. The proposed system transmits messages by harnessing the reaction time of a reactive jammer. It does not assume a reactive jammer with limited spectrum coverage and transmit power, and thus can be used in scenarios where traditional approaches fail. We develop a prototype of the proposed system using GNURadio. Our experimental evaluation shows that when a powerful reactive jammer is present, the prototype still keeps communication, whereas other schemes such as 802.11 DSSS fail completely.