In this paper the secrecy problem in the cognitive state-dependent interference channel is considered. In this scenario we have a primary and a cognitive transmitter-receiver pairs. The cognitive transmitter has the message of the primary sender as side information. In addition, the state of the channel is known at the cognitive encoder. Hence, the cognitive encoder uses this side information t...

JDMS, Volume 2, Issue 3, July 2005 Pages 121–143 © 2005 The Society for Modeling and Simulation International In recent years, new techniques for military modeling and simulation provided the practitioner with advanced mechanisms to describe complex applications. Some of the recent efforts in the field tried to address important issues in open research areas, ranging from agent-based modeling, ...

The Center for Collaborative Adaptive Sensing of the Atmosphere (CASA) is embarking on a paradigm of network of small radars to sample the atmosphere at high resolution. A fundamental physical limit imposed by transmission from single radar is the problem of decreasing resolution as a function of range. In addition the lowest coverage altitude increases with range due to earth curvature. As an ...

My long-term goal concerns component development for a novel hybrid lidar-radar system for underwater surveillance. Preliminary ocean experiments of the hybrid lidar-radar system have confirmed the potential of microwave-modulated pulsed lidar to be a superior detection mechanism for underwater surveillance [1]. The next step in the evolution of this novel technique is the improvement of the ke...

In Code Division Multiple Access (CDMA) systems all users transmit in the same bandwidth simultaneously. Communication systems following this concept are "spread spectrum systems''. In this transmission technique, the frequency spectrum of a data-signal is spread using a code uncorrelated with that signal. As a result the bandwidth occupancy is much higher then required. The codes used for spre...

It has been recognized that a two-aperture approach to ground moving target indication is sub-optimum and that target parameter estimation is often compromised by clutter interference or poor signal-to-clutter ratios. This paper explores several concepts for increasing the spatial diversity of RADARSAT-2 by exploiting the very flexible programming capabilities of the RADARSAT-2 antenna, allowin...

A theoretical and experimental analysis of two applications of the 42m electrooptic modulator is performed in the time and in the frequency domains. The analysis refers to the case of a harmonic electric input signal. The two applications are that of frequency transmitter, when the modulation is linear and the output signal has the same frequency as the modulating voltage, and that of frequency...

In this paper, we propose and evaluate regulatory policies that would improve sharing conditions/opportunities for indoor/outdoor ultra-dense networks to the radar bands where the demand actually is (i.e. hot spots and urban areas). We consider three regulatory policies: area power regulation, area deployment regulation and the combination of both of them. We address the scenario where the ultr...