Mainbeam jamming poses a particularly diicult challenge for conventional monopulse radars. In such cases spatially adaptive processing provides some interference suppression when the target and jammer are not exactly co-aligned, but the resulting array pattern is too distorted to be suitable for monopulse processing. The presence of coherent multi-path in the form of terrain scattered interfere...

In this paper, we propose a new method for evaluating the separation and dereverberation performance of a convolutive blind source separation (BSS) system, and investigate a separating system obtained by employing frequency domain BSS based on independent component analysis (ICA). As a result, we reveal the acoustical characteristics of the frequency domain BSS for convolutive mixture of speech...

OBJECTIVES The increasing rate of over using cell phones has been considerable in youths and pregnant women. We examined the effect of mobile phones radiation on genes expression variation on cerebellum of BALB/c mice before and after of the birth. MATERIALS AND METHODS In this study, a mobile phone jammer, which is an instrument to prevent receiving signals between cellular phones and base t...

In this paper, Independent Component Analysis is considered for blind suppression of interference caused by bit-pulsed jamming in a direct sequence spread spectrum communication system. A framework for applying blind techniques to the jammer mitigation problem was earlier introduced in [1]. However, the scheme proposed there is based on second-order statistics only, and has serious practical li...

Prevalent Wi-Fi networks have adopted various protections to prevent eavesdropping caused by the intrinsic shared nature of wireless medium. However, many of them are based on pre-shared secret incurring key management costs, and are still vulnerable from practical countermeasures. In this study, we investigate the feasibility of using defensive jamming technique to protect enterprise Wi-Fi net...

In this paper, beam-domain (BD) anti-jamming transmission in a downlink massive multiple-input multiple-output (MIMO) system is investigated. A smart jammer with multiple antennas attempts to interfere the signal reception of users desired energy efficiency (EE), whereas base station (BS) tries minimize cost while ensuring uninterrupted communication. Bayesian Stackelberg game between BS and ja...

Unmanned aerial vehicle (UAV) network is vulnerable to jamming attacks, which may cause severe damage like communication outages. Due the energy constraint, source UAV cannot blindly enlarge transmit power, along with complex topology high mobility, makes destination unable evade jammer by flying at will. To maintain a limited battery capacity in networks presence of greedy jammer, this paper, ...

Jammer and interference are sources of errors in positions estimated by GNSS receivers. The interfering signals reduce signal-to-noise ratio and cause receiver failure to correctly detect satellite signals. Because of the robustness of beamforming techniques to jamming and multipath mitigation by placing nulls in direction of interference signals, an antenna array with a set of multi-channel re...

Jamming attacks can significantly impact the performance of wireless communication systems, and can lead to significant overhead in terms of re-transmissions and increased power consumption. This paper considers the problem of optimal jamming over an additive white Gaussian noise channel. We derive the optimal jamming signal for various digital amplitudephase modulated constellations. We show t...