Robustness is the key attribute of Spread Spectrum (SS) watermarking scheme. Several SS image watermarking algorithms have been proposed for multimedia signals but very few works have taken into consideration the issues responsible for robustness improvement. The current paper has critically analyzed few such factors namely properties of spreading codes, proper signal decomposition suitable for...

A multi-structured design is a block design whose blocks have further structure like partitions, orders, arrays, etc. This problem have strong relationship to combinatorial arrays like orthogonal arrays, balanced arrays, and also many types of sequence problems, optical orthogonal codes, frequency hopping sequences, comma-free codes, etc. There are many different names of block designs which ha...

Development of an FHSS-based wireless telemetry system is a complicated process that involves evaluation of many trade-offs. This article delivers considerations on this process, describes criteria of efficient design, and analyzes existing solutions. The complex of techniques are suggested which allow improving characteristics of the FHSS-based wireless telemetry system compared to analogues.

Many basic locomotor patterns of living bodies are rhythmic, and oscillatory components of physical systems effectively contribute to the generation of the movement. The control signals for the basic locomotor patterns are generated by the central pattern generator (CPG), which is composed of collective neural oscillators, and the activity of the CPG is tightly synchronized with the movement of...

In this paper a distributed approach to radio scene analysis is considered. A Wireless Sensor Network, composed by Software Defined and Cognitive terminals, is used to classify air interfaces present in the radio scene. Two modes, namely Frequency Hopping Code Division Multiple Access and Direct Sequence Code Division Multiple Access, are identified employing a signal processing technique, Time...

Using techniques from hopping expansion we identically map the lattice Schwinger model with Wilson fermions to a model of oriented loops on the lattice. This is done by first computing the explicit form of the fermion determinant in the external field. Subsequent integration of the gauge fields renders a sum over all loop configurations with simple Gaussian weights depending on the number of pl...

Frequency hopping (FH) sequences play a key role in frequency hopping spread spectrum communication systems. It is important to find FH sequences which have simultaneously good Hamming correlation,large family size and large period. In this paper, a new set of FH sequences with large period is proposed, and the Hamming correlation distribution of the new set is investigated. The construction of...

Frequency hopping is a central method in wireless communication, offering improved resistance to adversarial interference and interception attempts, and easy non-coordinated control in dynamic environments. In this paper, we introduce a new model that supports a rigorous study of frequency hopping in adversarial settings. We then propose new frequency hopping protocols that allow a sender-recei...

This talk reviews some recent progresses in the study of low dimensional electron systems of strong correlations.