Mr. Victor Chukwuma Iheanacho
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Academic Career Length
7Years (2020-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
AIAleksandrs Ipatovs
Aleksandrs IpatovsVictor Chukwuma Iheanacho
Dmitrijs PikulinsSTSergejs Tjukovs
Sergejs TjukovsRURiga Technical University
Riga Technical UniversityThe paper is dedicated to the numerical and experimental study of nonlinear oscillations exhibited by the Vilnius chaotic generator. The motivation for the work is defined by the need for a comprehensive analysis of the dynamics of the oscillators being embedded into chaotic communication systems. These generators should provide low-power operation while ensuring the robustness of the chaotic oscillations, insusceptible to parameter variations and noise. The work focuses on the investigation of the dependence of nonlinear dynamics of the Vilnius oscillator on the operating voltage and component parameter changes. The paper shows that the application of the Method of Complete Bifurcation Groups reveals the complex smooth and non-smooth bifurcation structures, forming regions of robust chaotic oscillations. The novel tool—mode transition graph—is presented, allowing the comparison of experimental and numerical results. The paper demonstrates the applicability of the Vilnius oscillator for the generation of robust chaos, and highlights the need for further investigation of the inherent trade-off between energy efficiency and robustness of the obtained oscillations.
1 October 2020
Conference Paper
DCDarja Cirjulina
Darja Cirjulina
DPDmitrijs Pikulins
Dmitrijs Pikulins
RBRuslans Babajans
Ruslans BabajansDADavis Daniels Anstrangs
Davis Daniels Anstrangs
Victor Chukwuma IheanachoALAnna Litvinenko
Anna Litvinenko
A vast amount of different electronic oscillators with chaotic behavior have been proposed in the literature, but for this study a Vilnius chaotic oscillator (VCO) has been chosen. The low cost of such a circuit makes it attractive for secure communication between wireless sensor nodes. The chaotic signal is characterized by its high sensitivity to parameter offset. That is why oscillator element nominal value deviation and a supply voltage influences the behavior of the chaotic oscillator and synchronization between distinct circuits is needed to be studied. Theoretical analysis was performed using an LTspice simulation environment and experimental analysis was performed on a breadboard using Analog Discovery 2. MATLAB software was selected to process signals. 0 -1 test was selected to evaluate oscillator dynamics, to rate synchronization correlation coefficient calculation was used. The most sensitive elements were identified, and the regions of stable operation revealed.
Journal Article
STSergejs Tjukovs
Sergejs TjukovsDSDaniils Surmacs
Daniils SurmacsJGJuris Grizans
Juris GrizansVictor Chukwuma IheanachoDmitrijs PikulinsResource-constrained but widely deployed IoT devices require a new approach to ensure secure and reliable communications. That is why, in recent years, the paramount effort has been applied in lightweight cryptography. Because of its unpredictable nature, chaos is regarded as a potential candidate in cryptographic applications. Chaos mode of operation is observed not only in deliberately designed oscillators but also in switching DC-DC converters, which are part of almost every embedded design. The use of a built-in chaos source may improve performance, energy consumption, PCB area, and cost of IoT devices. In this research, the regions of robust chaos were identified using numerical analysis, and the performance of a real buck DC-DC converter under peak-current-mode control was studied experimentally. It was shown that a compensating ramp acts as a switch between different operating regimes. Despite minor performance degradation, chaos mode can be used for secure communications in IoT networks.
Preprint
AIAleksandrs Ipatovs
Aleksandrs IpatovsVictor Chukwuma IheanachoDmitrijs PikulinsSTSergejs Tjukovs
Sergejs TjukovsRURiga Technical University
Riga Technical UniversityThe paper is dedicated to the numerical and experimental study of nonlinear oscillations exhibited by the Vilnius chaotic generator. The need for practical applicability of the mentioned generator in chaotic communication systems defined the necessity to study the operation of the circuit in a wide parameter range. The bifurcation maps and corresponding one-parameter diagrams, obtained and analysed utilising the Method of Complete Bifurcation Groups, reveal the complex nonlinear dynamics and regions of robust chaotic oscillations. Laboratory experiments allow the verification of the numerical results and identification of the most practically relevant phenomena.
6 October 2022
Book Chapter
Dmitrijs PikulinsSTSergejs Tjukovs
Sergejs Tjukovs
Victor Chukwuma IheanachoAIAleksandrs Ipatovs
Aleksandrs Ipatovs
27 April 2023
Conference Paper
DSDaniils Surmacs
Daniils Surmacs
AIAleksandrs Ipatovs
Aleksandrs Ipatovs
DPDmitrijs Pikulins
Dmitrijs Pikulins
STSergejs Tjukovs
Sergejs Tjukovs
Victor Chukwuma IheanachoALAnna Litvinenko
Anna Litvinenko
Nonlinear modes of operation have been observed in a range of switching power converters (SPC) for decades. Contrary to the standard approach to eliminate these regimes, we obtain the set of parameters that ensures the generation of robust chaotic oscillations of the converters. The current paper studies the effects of the subharmonic and chaotic modes on the main conversion characteristics of SPC. Numerical calculations and Spice simulations allow the detection of chaotic regions with the lowest influence on the output voltage ripples and conversion efficiency. It has been proved that with the appropriate choice of parameters, the SPC could be efficiently used as the source of chaos, ensuring the main functionality with acceptable performance characteristics.
About Me
Victor Chukwuma Iheanacho is a PhD candidate in Electronics Engineering at Riga Technical University (RTU), Riga, Latvia. He received his Bachelor of Engineering Science in Electronics from Kaunas University of Technology, Lithuania, in 2017, and his Master of Engineering Science in Electronics from RTU in 2019, where he is now completing his doctoral research. At RTU he has served as a research and teaching assistant in the Faculty of Electronics and Telecommunications, carrying out numerical analysis of electronic systems and teaching the Digital System Design and Fundamentals of Material Science courses; he also works as a software developer in industry. His current research interests are the nonlinear dynamics of electronic chaotic oscillators, bifurcation analysis, and numerical continuation, together with the development of generalised, efficient algorithms — building on the Method of Complete Bifurcation Groups — for identifying robust-chaos regimes relevant to secure communication and signal processing. His earlier work covered sub-nanosecond time-to-digital conversion and Peltier-based thermoelectric cooling. He has co-authored several journal and conference papers on chaotic oscillators and switching converters, and has received study grants from Riga Technical University.