In the present work we deal with the concept of alpha-fair resource allocation in the situation where the decision maker (in our case, the base station) does not have complete information about environment. Namely, we develop a concept of α-fairness under uncertainty to allocate power resource in the presence of a jammer under two types of uncertainty: (a) the decision maker does not have compl...

In this paper, we investigate the secure transmission in wireless sensor networks (WSNs) consisting of one multiple-antenna base station (BS), multiple single-antenna legitimate users, one single-antenna eavesdropper and one multiple-antenna cooperative jammer. In an effort to reduce the scheduling complexity and extend the battery lifetime of the sensor nodes, the switch-and-stay combining (SS...

To combat main lobe jamming, preventive measures can be applied to radar in advance based on the concept of active antagonism, and efficient antijamming strategies designed through reinforcement learning. However, uncertainties jammer, which will result a mismatch between test training environments, are not considered. Therefore, robust strategy design method is proposed this paper, frequency-a...

The arbitrarily varying channel models transmission over a channel with an state that can change over time. We may interpret it as a channel with an evil jammer. The arbitrarily varying channel was first introduced by Blackwell, Breiman, and Thomasian in [8]. The wiretap channel models communication with security. It was first introduced by Wyner in [12]. We may interpret it as a channel with a...

In this paper, we analyze the impact of a friendly unmanned aerial vehicle (UAV) jammer on UAV communications in presence multiple eavesdroppers. We first present channel components determined by line-of-sight (LoS) probability between and ground device, introduce different fadings for LoS non-line-of-sight (NLoS) links. then derive secrecy transmission satisfying both constraints legitimate wi...

NAVSYS has developed a miniaturized GPS antenna array technology that reduces the size of the antenna elements and the array dimensions. This technology enables GPS controlled reception pattern antenna arrays (CRPAs) with anti-jamming capability to be installed on vehicles where their size has previously prohibited their use. This includes aircraft where size and weight constraints resulted in ...

Electromagnetic jamming results in a loss of link reliability, increased energy consumption and packet delays. In the context of energy-constrained wireless networks, nodes are scheduled to maximize the common sleep duration and coordinate communication to extend their battery life. This coordination results in statistical and predictable activity patterns that may be easily detected and jammed...

The project considers signal processing techniques for anti-jam GPS. The jammer mitigation may be performed in time, frequency, time-frequency, and space-time domains. Existing techniques assume knowledge of satellite positions or/and code synchronization. Both assumptions become invalid at the "cold" start or at persistent jamming. In the proposed technique, suppression of the interference is ...