Riccardo Rovatti

Learn More
The application of chaotic dynamics to signal pmcessing tub s t e m fiom the realization that its complex behaviors become tractable when observed f m m a statistical perspective. Here we ilIwtrate the validity of this statement by considering two noteworthy problem-namely. the synthesis of high-elecbvmagnetic compatibility clock signals and the generation(More)
We present a true random number generator which, contrary to other implementations, is not based on the explicit observation of complex micro-cosmic processes but on standard signal processing primitives, freeing the designer from the need for dedicated hardware. The system can be implemented from now ubiquitous analog-to-digital converters building blocks,(More)
This paper and its companion are devoted to the evaluation of the impact of chaos-based techniques on communications systems with asynchronous code division multiple access. Sequences obtained by repeating a truncated and quantized chaotic time series are compared with classical -sequences and Gold sequences by means of a performance index taken from(More)
The idea that compressed sensing may be used to encrypt information from unauthorized receivers has already been envisioned but never explored in depth since its security may seem compromised by the linearity of its encoding process. In this paper, we apply this simple encoding to define a general private-key encryption scheme in which a transmitter(More)
In this paper we review some statistical tests included in the NIST SP 800-22 suite, which is a collection of tests for the evaluation of both true-random (physical) and pseudorandom (algorithmic) number generators for cryptographic applications. The output of these tests is the so-called <i>p</i>-value which is a random variable whose distribution(More)
The availability of multi-standard terminals will be key to provide location independent connections able to take advantage of any possible infrastructure. This paper addresses both the architecture and the circuits for the RF front-end of a terminal with cellular (GSM, EDGE and UMTS), LAN (IEEE802.11a/b/g) and Bluetooth radio interfaces. A multi-standard(More)
We present the design and the validation by means of state-of-the-art randomness tests of a high-quality true random number generator which internally exploits a pipeline analog-to-digital converter modified to operate as a set of interleaved chaotic maps. Developing the circuit design relying on pipeline A/D technology, which is ubiquity used in all mixed(More)
The average ridge distance of "ngerprint images is used in many problems and applications. It is used in "ngerprint "lter design or in identi"cation and classi"cation procedures. This paper addresses the problem of local average ridge distance computation. This computation is based on a two-step procedure: "rst, the average distance is de"ned in each(More)
In this paper, we propose a prototype of a spread-spectrum clock generator which is the first known specifically meant generator for 3-GHz Serial Advanced Technology Attachment II (SATA-II) applications. A further innovative aspect of our prototype is that it takes advantage of a chaotic pulse-amplitude modulation as driving signal, instead of a triangular(More)
An algorithm for the linear interpolation of multi-input functions sampled on rectangular grids is presented. A geometric approach is adopted and the mathematics is thoroughly developed. We show that the algorithm is optimum. In fact, when the number n of inputs grows to infinity its computational requirement is 2(n log n), which is the same as the(More)