33 research outputs found
Correlated Jamming in a Joint Source Channel Communication System
We study correlated jamming in joint source-channel communication systems. An
i.i.d. source is to be communicated over a memoryless channel in the presence
of a correlated jammer with non-causal knowledge of user transmission. This
user-jammer interaction is modeled as a zero sum game. A set of conditions on
the source and the channel is provided for the existence of a Nash equilibrium
for this game, where the user strategy is uncoded transmission and the jammer
strategy is i.i.d jamming. This generalizes a well-known example of uncoded
communication of a Gaussian sources over Gaussian channels with additive
jamming. Another example, of a Binary Symmetric source over a Binary Symmetric
channel with jamming, is provided as a validation of this result
On AVCs with Quadratic Constraints
In this work we study an Arbitrarily Varying Channel (AVC) with quadratic
power constraints on the transmitter and a so-called "oblivious" jammer (along
with additional AWGN) under a maximum probability of error criterion, and no
private randomness between the transmitter and the receiver. This is in
contrast to similar AVC models under the average probability of error criterion
considered in [1], and models wherein common randomness is allowed [2] -- these
distinctions are important in some communication scenarios outlined below.
We consider the regime where the jammer's power constraint is smaller than
the transmitter's power constraint (in the other regime it is known no positive
rate is possible). For this regime we show the existence of stochastic codes
(with no common randomness between the transmitter and receiver) that enables
reliable communication at the same rate as when the jammer is replaced with
AWGN with the same power constraint. This matches known information-theoretic
outer bounds. In addition to being a stronger result than that in [1] (enabling
recovery of the results therein), our proof techniques are also somewhat more
direct, and hence may be of independent interest.Comment: A shorter version of this work will be send to ISIT13, Istanbul. 8
pages, 3 figure
A hardware solution to overcome the bandwidth limitation of drone jamming platforms
Drone jamming platforms are faced with a significant constraint on bandwidth limitation compared to the broadband spectrum used by remote control radio links in view of implementing the advanced techniques of spread spectrum on these devices. In this work, we propose a hardware solution to overcome the bandwidth limitation of drone jamming platforms by using the dual AD9361 transceiver integrated on the AD-FMCOMMS5-EBZ radio prototyping platform. The hyperchaotic generator of random digital signals and the custom control architecture have been implemented on the ZC706 FPGA development board. A versatile real time chaotic signals generation IP have been developed and integrated on the FMCOMMS5-EBZ HDL reference design considering timing constraints related to the AD9361 data exchange and the AXI-LITE bus interface. The experimental results showed a coverage capacity of more than 100 MHz of bandwidth, which made it possible to guarantee an integral coverage of the WIFI band and consequently to neutralize any potential threat evolving on this band
Effective GPS jamming techniques for UAVs using low-cost SDR platforms
Lately, a rising number of incidents between unmanned aerial vehicles (UAVs) and airplanes have been reported in airports and airfields. In order to help cope with the problem of unauthorized UAV operations, in this paper we evaluate the use of low cost SDR platforms (software defined radio) for the implementation of a jammer able to generate an effective interfering signal aimed at the GPS navigation system. Using a programmable BladeRF x40 platform from Nuand and the GNU radio software development toolkit, several interference techniques were studied and evaluated, considering the spectral efficiency, energy efficiency and complexity. It was shown that the tested approaches are capable of stopping the reliable reception of the radionavigation signal in real-life scenarios, neutralizing the capacity for autonomous operation of the vehicle.info:eu-repo/semantics/acceptedVersio