Chaos-based communication systems are known to offer advantages that are shared by spread-spectrum communications. One important aspect of the performance of any spread-spectrum communication system is the ability to resist jamming. In this paper, an analysis of the antijamming performance of a coherent chaos shift keying system under the influence of a common pulsed-noise jammer is presented. ...

In this paper, we study the power allocation problem for a cognitive radio in the presence of a smart jammer over parallel Gaussian channels. The objective of the jammer is to minimize the total capacity achievable by the cognitive radio. We model the interaction between the two players as a zero-sum game, for which we derive the saddle point closed form expression. First, we start by solving e...

In this paper, we investigate the performance of an unmixing system obtained by frequency domain Blind Source Separation (BSS) based on Independent Component Analysis (ICA). Since ICA is based on statistics, i.e., it only attempts to make outputs independent, it is not easy to predict what is going on in a BSS system. We therefore investigate the detailed components in the processed signals of ...

Jammers are the devices that disturb the communication in wireless networks. If the actual position of jammer is located then it is possible to eliminate the disturbances in communication networks. This project designs a framework to locate the position of a single or multiple jammers more accurately. Many present jammer localizing schemes use indirect methods considering the hearing ranges, pa...

Spread spectrum modulation techniques ensure protection against externally generated interfering signals i.e. signals generated from jammers, developed initially for military applications. This protection against jamming waveforms is achieved by forcing the information signal to occupy bandwidth many times greater than the signal bandwidth, this makes the transmitted signal to appear as noise, ...

The Johns Hopkins University/Applied Physics Laboratory Laurel, Maryland ABSTRACT Monte Carlo simulations model the eflects of partial-band jamming on turbo code performance over a slow frequency-hopped spread spectrum signal. Decoders using both hard and soft decision variables corrupted by Additive White Gaussian Noise (A WGN) are considered. Modulations include both Binary Phase Shzjl Keying...

Large regions of a Synthetic Aperture Radar (SAR) image can potentially be destroyed by an airborne broadband jammer. Jammer components include both the direct-path and multipath reflections from the ground, known as hot-clutter (HC) or terrain scattered interference. Using multiple antennas on a SAR provides spatial degrees of freedom and allows for beamforming to reject the direct-path signal...

We consider jamming in wireless networks with transmission cost for both transmitter and jammer. We use the framework of non-zerosum games. In particular, we prove the existence and uniqueness of Nash equilibrium. It turns out that it is possible to provide analytical expressions for the equilibrium strategies. These expressions is a generalization of the standard water-filling. In fact, since ...