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We propose a continuous-variable quantum key distribution (CVQKD) protocol that uses a Shannon- Kotel'nikov expansion map for preparing coherent states. This kind of mapping acts like an analog error correcting code that improves the fidelity between the source signal and the reconstructed one at the receiver. It is well known that a limitation for extending CVQKD to larger distances is the reconciliation...
A compact electromagnetic multi-resonator is presented in this paper using a new technique for chipless RFID tag data encoding. Employing Archimedean spirals, the information is applied into the spectral signature shifting resonant frequencies in several positions. The multi-resonator tag proposed operates in microwave band (between 3.0–7.0GHz) and has a coding data capacity of up to 100 decimal numbers...
As originally designed, the wavelet coding technique efficiently overcomes the fading effects, but limits the spectral efficiency of these systems to 1 bit/s/Hz. Furthermore, the coded symbols are modulated by unusual signal constellations that need to be designed by optimization methods. An alternative approach based on wavelet matrix to increases the communication system robustness to time-varying...
At the moment, the most popular information encoding technique is based on the generation of a particular signature in the spectrum of the backscattered signal. Chipless tags which rely on spectral signature encode data by using resonant structures working as band rejection filters, designed to resonate at defined frequencies. In this paper, a parametric study of different layouts of spiral resonator...
Cryptographic keys based on biometrics, besides offering information security and privacy, have the advantage of being strongly linked to the user. Three main techniques use biometric data to obtain cryptographic keys: cryptographic key release, cryptographic key generation and cryptographic key regeneration. The main objectives of these schemes are to ensure revocability and produce keys with high...
Chipless RFID systems appears as an alternative to reduce the costs of RFID systems by using tags without a chip. The design of these new systems impose some challenges as the design of a tag, processing the signal reflected by the tag, among others. In this paper we consider the problem of collisions in the signal reflected simultaneously by various tags, and the recovery of information in these...
Radio identification (RFID) systems based on chipless tags, outperforms traditional RFID systems in terms of costs, and the actual challenge in the former systems is to improve the quantity of bits written in a tag. Actually, the main information encoding technique is based on the generation of a particular signature in the spectrum of the backscattered signal. Chipless tags based spectral signature...
Chipless Radio Frequency Identification (RFID) systems were proposed to reduce the costs of RFID systems by using tags without a chip. The absence of a chip imposes the necessity of developing new techniques for information recovery from the reflected signal. In this paper we consider the application of the Fractional Fourier Transform - FrFT for the recovery of information in from collided signals...
This article describes a new structure of finite fields multiplier based on Mastrovito multiplier. This architecture has linear threshold gates as the processing units, which is the basic element of a discrete neural network. One of the great advantages of using neural networks implemented with discrete linear threshold gates is that it reduces the complexity of certain circuits before implemented...
Alzheimer's disease is the most common cause of dementia, yet hard to diagnose precisely without invasive techniques, particularly at the onset of the disease. This work approaches image analysis and classification of synthetic multispectral images composed by diffusion-weighted (DW) magnetic resonance (MR) cerebral images for the evaluation of cerebrospinal fluid area and measuring the advance of...
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