Modern Radars use phased array antenna for higher directive gains. These array antennas can be used to form a beam in the desired direction also known as beam steering, if there is any jammer present then it cannot be suppressed by just beamforming or beam steering, in such case we need to use Adaptive antenna. Adaptive antennas use the smart signal processing algorithms also known as adaptive ...

Cognitive jammers are able to deploy advanced strategies that degrade the performance of cognitive radio user communications. In this paper, we study the problem of power allocation in cognitive radio user and jammer games, over parallel Gaussian channels. We model the interaction between a communicator (a transmitter-receiver pair) and a jammer using zero-sum games with continuous action sets;...

Recently, Amin et al. introduced a projection filtering method for excising constant amplitude FM jammers from DSSS communications, with minimal distortion to the PN sequence. In this paper, we show that this approach can be applied to AM-FM jammers as well, with a simple modification. Theoretical performance measures (correlator SNR) of the AM-FM projection method are derived, and demonstrate ...

■ Military satellite communications (Milsatcom) systems use frequency hopping over a wide bandwidth to provide protection from hostile jamming, interception, and detection. These systems are being challenged to transport more information at higher rates, among smaller and more mobile terminals, with little or no increase in allocated bandwidth. Meeting these challenges requires advanced bandwid...

Rendezvous problem has been attracting much attention as a fundamental process to construct the Cognitive Radio Network (CRN). Many elegant algorithms have been proposed to achieve rendezvous on some common channel in a short time, but they are vulnerable to the jamming attacks where a jammer may exist listening or blocking the channels [13]. In this paper, we propose the Multi-Radio Channel De...

Cancellation is a process by which an interfering source (“jammer”) is removed from a mixture of sounds on the basis of its structure. This is part of the task of “scene analysis” that confronts natural organisms and artificial devices. Jammer cancellation is distinct from, and complementary to, target enhancement. Time-domain cancellation filters are distinct from, and complementary to, time-f...

Cancellation is a process by which an interfering source (the “jammer”) is removed from a mixture of sounds on the basis of its structure. This is part of the task of “scene analysis” that confronts natural organisms and artificial devices. Jammer cancellation is distinct from, and complementary to, target enhancement. Time-domain cancellation filters are distinct from, and complementary to, ti...

Cancellation is a process by which an interfering source (“jammer”) is removed from a mixture of sounds on the basis of its structure. This is part of the task of “scene analysis” that confronts natural organisms and artificial devices. Jammer cancellation is distinct from, and complementary to, target enhancement. Time-domain cancellation filters are distinct from, and complementary to, time-f...

A multi band sleeve dipole antenna for jammer application is proposed. The antenna can cover band in which mobile and other wireless devices operate. The design antenna shows very good omnidirectional characteristics and scattering parameter S11 value less than -10db. The dipole is made of two concentric hallow cylinder with different radius and different lengths. The antenna is fed at the cent...

In this work, the mobility of network nodes is explored as a new promising approach for jamming defense. To fulfill it, properly designed node motion that can intelligently adapt to the jammer’s action is crucial. In our study, anti-jamming mobility control is investigated in the context of the single and multiple commodity flow problems, in the presence of one intelligent mobile jammer which c...