Chaotic Communication

Visveshwaraiah Technological University Belgaum KNS Institute of Technology, Bengaluru

CHAOTIC COMMUNICATION

Guided by: Mr. Pavan Kumar E B.E (lecturer ECE department)

By : Rudrappa J Shetti

• INTRODUCTION • DEFINITION OF CHAOS • CHAOTIC SYSTEM • CHAOTIC SIGNALS • ATTRACTORS • GENERATION OF CHAOTIC COMMUNICATION • PROPERTIES OF CHAOTIC COMMUNICATION • ADVANTAGES OVER TRADITIONAL METHODS • APPLICATIONS •CONCLUSION • QUESTIONS

1 . Communication efficiently 2. Randomness 3.Chaotic Systems 4.Chaotic Signals 5.Security

Chaos is aperiodic time-asymptotic behaviour in a deterministic system which exhibits sensitive dependence on initial conditions This definition contains three main elements: 3.Aperiodic time-asymptotic behaviour 5.Deterministic 7.Sensitive dependence on initial conditions

All systems can be basically divided into three types: 1.Deterministic systems 2. Stochastic systems 3. Chaotic systems  

• Chaotic signals has broadband spectrum • Power output remains constant • It is resistant against multipath fading • Chaotic signals are aperiodic • Chaotic signals are complex in structure • chaotic signals appear noise like •Hence chaotic signal can be used for providing security at physical level

An attractor is informally described as strange if it has non-integer dimension or if the dynamics on it are chaotic. Chaotic attractor is also known as a strange The term was coined by David Ruelle and Floris attractor, Takens a type of attractor (i.e., an attracting set of states) in a complex dynamical system's phase space that shows sensitivity to initial conditions FIXED POINT LIMIT CYCLE

An attractor that is represented by a particular point in phase space, sometimes called an equilibrium point. As a point it corresponds to a very limited range of possible behaviors of the system. A limit cycle is a periodic orbit of the system that is isolated.

First generation

1.Additive chaos masking 2.Chaotic shift keying Second generation 1.Chaotic parameter modulation 2.Chaotic non-autonomous modulation Third generation 1.Chaotic cryptosystem Forth generation 1.impulsive synchronization based cscs

 The additive chaos masking scheme chann el

The chaotic parameter modulation.

The chaotic non-autonomous modulation. .

chaotic cryptosystem

The impulse synchronization

•Why are we interested in chaos? Certain properties of chaotic systems are appealing for communications such as 1. Low power 2. Broadband spectra 3. Noise-like appearance 4. Auto and cross correlation properties

 Digital msg sent at Gbps speeds over 115Kms  BER of one in ten million [ BER said to be

limited by the equipment rather than the technique itself ]  Hard to detect by eavesdroppers  Less risk of interception

t high speed it is easier to generate strong , high power chao signals than periodic signals. Chaotic signals are not sensitive to initial conditions and hav noise like time series. Chaotic transmission has less risks of interception and are ha to detect by eavesdropper. n chaotic communication, then on linear characteristic of communication devices are utilized instead of being avoided this eliminates the complicated measures to maintain linear Chaotic communication systems can function over a larger dynamical range, with fewer complex components and oper higher power levels than traditional communication systems

 Used  Used  Used  Used  Used  Used

in Ultra Wide Band radio. in radar and sonar. in oscillator. in Chaotic masking . in spread spectrum. for secure communication

A very brief overview on Chaotic communication has been described, explaining the systems, signals,synchronisations and a brief of histroy Chaotic communication .The majority of research carried out , to prove Chaotic communication has advantages over traditinal communication system . At last but not least application of Chaotic communication