Experimental Validation of Wireless Communication with Chaos

The work was supported in part by the NSFC (60804040 and 61172070), the Key Basic Research Fund of Shaanxi Province (2016ZDJC-01), the Innovation Research Team of Shaanxi Province (2013KCT-04), the Fok Ying Tong Education Foundation (Grant No. 111065), the Collaborative innovation program of Xi’an city (CXY1509-19), and the EPSRC (EP/I032606/1). Chao Bai was supported by Excellent Ph.D. research fund from XAUT.Peer reviewedPublisher PD

Chaos-based communication scheme using proportional and proportional-integral observers

In this paper, we propose a new chaos-based communication scheme using the observers. The novelty lies in the masking procedure that is employed to hide the confidential information using the chaotic oscillator. We use a combination of the addition and inclusion methods to mask the information. The performance of two observers, the proportional observer (P-observer) and the proportional integral observer (PI-observer) is compared that are employed as receivers for the proposed communication scheme. We show that the P-observer is not suitable scheme since it imposes unpractical constraints on the messages to be transmitted. On the other hand, we show that the PI-observer is the better solution because it allows greater flexibility in choosing the gains of the observer and does not impose any unpractical restrictions on the message

Chaos-based underwater communication with arbitrary transducers and bandwidth

Acknowledgments: This research is supported in part by National Natural Science Foundation of China (61172070), Innovative Research Team of Shaanxi Province (2013KCT-04), The Key Basic Research Fund of Shaanxi Province (2016ZDJC-01), EPSRC (EP/I032606/1), Chao Bai was supported by Excellent Ph.D. research fund (310-252071603) at XAUT.Peer reviewedPublisher PD

Design and Implementation of Secure Chaotic Communication Systems

Chaotic systems have properties such as ergodicity, sensitivity to initial conditions/parameter mismatches, mixing property, deterministic dynamics, structure complexity, to mention a few, that map nicely with cryptographic requirements such as confusion, diffusion, deterministic pseudorandomness, algorithm complexity. Furthermore, the possibility of chaotic synchronization, where the master system (transmitter) is driving the slave system (receiver) by its output signal, made it probable for the possible utilization of chaotic systems to implement security in the communication systems. Many methods like chaotic masking, chaotic modulation, inclusion, chaotic shift keying (CSK) had been proposed however, many attack methods later showed them to be insecure. Different modifications of these methods also exist in the literature to improve the security, but almost all suffer from the same drawback. Therefore, the implementation of chaotic systems in security still remains a challenge. In this work, different possibilities on how it might be possible to improve the security of the existing methods are explored. The main problem with the existing methods is that the message imprint could be found in the dynamics of the transmitted signal, therefore by some signal processing or pattern classification techniques, etc, allow the exposition of the hidden message. Therefore, the challenge is to remove any pattern or change in dynamics that the message might bring in the transmitted signal

Analysis of a new modulation/ multiplexing technique using mutually orthogonal chaotic waveforms

A new digital modulation technique proposed [3] by Dr. Chance M. Glenn is presented and analyzed in this report. The report explains the MOC algorithm as a means of creating information-bearing baseband signals for modulation in digital communications. The process uses the natural diversity of chaotic oscillations. An orthogonal triplet of waveforms is extracted from the oscillations produced by a chaotic process. A simple digital communication system is built, which uses this triplet as basis waveforms to formulate a baseband waveform. There is a lot of research work done and still going on to use chaotic oscillations in the communication system. The previously proposed communication systems have a disadvantage of not retrieving the data back at the demodulator as the demodulator need to be synchronized with the modulator, which cannot be implemented in real time. We propose a new way of using chaotic oscillations. The work done and contribution toward the thesis includes finding sets of mutually orthogonal chaotic waveforms using the data collected from the various chaotic oscillations, finding an optimal set of chaotic waveforms that can be used in the communication system. We demonstrated the implementation of the communication system using Matlab and Simulink. We simulated and analyzed the communication system built based on the MOC waveforms. We compared the results yielded with other modulation schemes like QAM, QPSK. The goal is to show that the system outperforms other comparable modulation/multiplexing techniques. We\u27ll use concepts such as the spectral efficiency and bit error rate to show and compare the results

Information transmission methods with through the use of stochastic signals

The paper provides an overview of information transmission methods through the use of the noise carrier proposed by researchers from the middle of the last century to the present day. It is shown that the main areas of application of autocorrelation systems with the noise carrier is the confidential communication system construction, where the protection of the transmitted information from intercepting and protection of the channel from the extraneous information injecting are of priority. Methods of information transfer, discussed in the paper, allow solving the problem of sustainable communication in difficult conditions of signal propagation with simple technical means, especially in multipath channels. The paper studies the most urgent theoretical and practical problems relating to communication systems with the noise carrier

Chaos-Based Spectral Keying Technique for Secure Communication and Covert Data Transmission between Radar Receivers over an Open Network Channel

Application of chaotic signals in modern telecommunication facilities and radars is an actual task that can significantly extend functionality of these systems and improve their performance. In this chapter, we propose a concept of chaos-based technique for secure communication and hidden data transmission over an open network channel which is based on a novel method for spectral keying of chaotic signal generated by nonlinear dynamical system with delayed feedback. In the technique developed, the modulating information sequence controls the parameter of nonlinear element, so that it switches the chaotic modes and changes the spectral structure of the signal, transmitted to the communication channel. A noncoherent reception is used for demodulation the information message from received waveform. We start from theoretical justification of the proposed scheme, and show then the numerical simulations and imitation modeling results, as well as demonstrate experimental validation of suggested technique. Also, the communication system reliability and its covert operation efficiency under impact of AWGN in the environment with high-level interferences have been shown by means of evaluation the system anti-jamming capabilities and unauthorized access immunity