Guaranteeing security in information exchange is a challenge public networks, such as the highly popular application layer Message Queue Telemetry Transport (MQTT) protocol. On one hand, chaos generators have shown their usefulness masking data that can be recovered while having appropriate binary string. Privacy then accomplished by implementing synchronization techniques to connect transmitter and receiver, among millions of users, encrypt decrypt correct key. other chaotic sequences...

Synchronizing chaotic oscillators has been a challenge to guarantee successful applications in secure communications. That way, three synchronization techniques are applied herein twenty two oscillators, of them based on piecewise-linear functions and nineteen proposed by Julien C. Sprott. These simulated generate time series that used evaluate their Lyapunov exponents Kaplan-Yorke dimension rank unpredictability. The with the high positive exponent implemented into field-programmable gate...

This paper presents the application of three optimization algorithms to increase chaotic behavior fractional order Chen system. is achieved by optimizing maximum Lyapunov exponent (MLE). The applied techniques are evolutionary (EAs), namely: differential evolution (DE), particle swarm (PSO), and invasive weed (IWO). In each algorithm, process performed using 100 individuals generations from 50 500, with a step 50, which makes total ten independent runs. results show that optimized systems...

Fractional-order chaotic oscillators (FOCOs) have shown more complexity than integer-order ones. However, the majority of electronic implementations were performed using embedded systems; compared to analog implementations, they require huge hardware resources approximate solution fractional-order derivatives. In this manner, we propose design FOCOs integrators based on operational transconductance amplifiers (OTAs). The case study shows implementation by cascading first-order OTA-based...

A Direct Current (DC) microgrid is a concept derived from smart grid integrating DC renewable sources. The microgrids have three particularities: (1) integration of different power sources and local loads through link; (2) on-site source generation; (3) alternating (on-off state). This kind arrangement achieves high efficiency, reliability versatility characteristics. key device in the development electronic converter (PEC), since it allows an efficient energy conversion between loads....

Abstract Terrain exploration robots can be of great usefulness in critical navigation circumstances. However, the challenge is how to guarantee a control for covering full terrain area. That way, application chaotic oscillator wheels an autonomous mobile robot, introduced herein. Basically, we describe realization random number generator (RNG) based on double-scroll oscillator, which used guide robot cover The resolution area determined by both bits provided RNG and characteristics step...

Purpose – The paper aims to focus on the memory-polynomial model (MPM) as special case of Volterra series, implemented in hardware. behavior MPM is fully proved through a comparison with AM-AM and AM-PM measured data. results show that this simulation technique able prove effectiveness implementation behavioural for high power radiofrequency amplifiers. system compensate perturbations caused by modern communication systems. Design/methodology/approach uses Matlab-Simulink, its digital signal...

Model-based nonlinear embedding is applied for the first time to design of an asymmetrically-driven class-F Chireix power amplifier (PA). The model a 15 W GaN HEMT used determine optimum load impedances fundamental and multi-harmonics required at package reference planes such that two intrinsic transistors operate with recently reported ideal current-based combiner. A symmetric circuit topology so phase offset combiner maintained through from packaged nodes up drive generators. Unlike...

This paper considers a three-dimensional nonlinear dynamical system capable of generating spherical attractors. The main activity is the realization chaotic attractor on Intel and Xilinx FPGA boards, with focus implementation secure communication system. first major contribution successful synchronization two systems, in VHDL program, master-slave topology using Hamiltonian forms. errors show that systems synchronize very short time after which error signals become zero. second...

The phase portrait for dynamic systems is a tool used to graphically determine the instantaneous behavior of its trajectories set initial conditions. Classic portraits are limited two dimensions and occasionally snapshots 3D presented; unfortunately, single point view third or higher order system usually implies information losses. To solve that limitation, some authors an additional degree freedom represent in three dimensions, example color graphics. Other perform states combinations,...

The main goal of this work is to optimize the chaotic behavior a three-dimensional chaotic-spherical-attractor-generating fractional-order system and compare results with its novel hyperchaotic counterpart. smooth perturbed hyperbolic tangent function. There are two major contributions in investigation. First, maximum Lyapunov exponent was optimized by applying evolutionary algorithms, which meta-heuristics search namely, differential evolution, particle swarm optimization, invasive weed...

The need for reconfigurable, high power density, and low-cost configurations of DC-DC electronic converters (PEC) in areas such as the transport electrification use renewable energy has spread out requirement to incorporate a single circuit several topologies, which generally result an increment complexity about modeling, control, stability analyses. In this paper, reconfigurable topology is presented can be applied alterative/changing conversion scenarios consists Buck, Boost, Buck-Boost...

In this paper, the parameter-switching technique was applied to control chaos in Chen oscillator and as a decryption mechanism secure transmission system, transmit RGB grayscale images. past few decades, considerable efforts have been put into study of stabilization chaotic dynamical systems. Most well-known methods, such Ott, Grebogi, Yorke (OGY), Pyragas, open-loop force an unstable periodic orbit stable one while distorting original attractor. On other hand, is elegant method that can...

The main objective of this work was to implement the parameter-switching chaos control scheme for fractional-order spherical systems and develop a chaos-based image encryption transmission system. novelty in developed secure communication system is application decryption RGB grayscale images, which undergo one round using chaotic states fractional diffusion process. has synchronized master slave topology, resulting transmitter receiver encrypting decrypting respectively. This demonstrated...

Abstract This article presents a technique to integrate two dynamical models, four-wing spherical chaotic oscillator and the elliptical path described by planet Earth during its translation movement around sun. Four application cases are derived from system varying dynamics of these can be applied in information encryption transmit RGB grayscale images modulated CSK. Consequently, three main contributions this work (1) emulation trajectories with interference, (2) CSK modulation image...

Due to their high robustness and simple maintenance, induction motors (IM) are commonly applied in household appliances industry. Recently, advanced control techniques being traditional controllers such as field-oriented (FOC) torque (DTC). Dynamic performance improvement, hardware simplification software resource reduction some of the characteristics reported by these techniques, where a comparison new proposal with structure is generally for its validation. However, an assessment between...

Voltage-lift is a widely used technique in DC–DC converters to step-up output voltage levels. Several traditional and advanced control techniques applicable power electronic (PEC) have been reported utilized for voltage-lift applications. Similarly, recent years the implementation of fractional-order controllers (FOC) PEC applications has gained interest, aiming improve system performance, validated basic converter topologies. Following this trend, work presents an FOC converter, requiring...

This paper describes the following results in Nambu mechanics: definition of simple physical systems; result applying Kalnay and Tascon theorem (1978) to study different groupings n phase space variables into an s-coordinate (n-s)-momentum; intrinsic geometry curve that solves equations motion by explicit construction local coordinate system; sets Hamiltonians generate same set differential equations; a way construct canonical transformations; system known have chaotic behaviour: Lorenz...

Summary To provide an adequate signal integrity to a power amplifier (PA), we propose digital system for the degradation at transmitter path, and it is implemented on field‐programmable gate array (FPGA) board. The proposed offers following features: A ‐ary quadrature amplitude modulation (QAM) generation in‐phase/quadrature (IQ) imbalance mitigation, by default, performs as predistortion model extraction from PA‐measured data. simulations tests provided are performed effectively verify PA...