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We consider the real time transmission of scalable multimedia data with a constrained end-to-end Quality of Service. In the Rayleigh channel case, the resulting optimization problem is solved by the Flexible Transmission (FT) algorithm. This resources allocation strategy allows to transmit the sole layers with guaranteed QoS at the receiver. Here, we propose to extend the FT method to the OFDM case...
Graphical codes resemble very much the well-known QR-codes, although they are used in a very different application scenario: authenticating and tracing physical goods on which they are printed with small dimensions so as to become uncloneable. In this paper, we propose a security analysis of such codes based on a realistic channel model. We show that the security level of such codes heavily depends...
In this paper, we investigate the authentication problem of real-world goods on which 2D bar-codes (2D-BC) were printed and we take the opponent's point of view. The opponent is assumed to have access to Nc noisy copies of a genuine 2D-BC (noise being due to printing and scanning processes). A simple estimator of the 2D-BC based on copies averages is proposed, letting the opponent print a fake 2D-BC...
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