A. S. Dmitriev

EXPERIMENTS ON SPEECH AND MUSIC SIGNALS TRANSMISSION USING CHAOS

This letter presents experimental evidence of how to use Chuas circuit for creating a system transmitting complex analog signals such as speech and music. In comparison with other proposed systems our system has the advantage of being operational over a wide dynamic range of information to chaotic signal ratios.

Experiments on Direct Chaotic Communications in Microwave Band

We discuss a concept of Direct Chaotic Communications (DCC) that is based on the following ideas: (1) chaotic oscillator generates signals directly in a specified microwave band; (2) information component is put in the chaotic signal by means of formation of an appropriate stream of chaotic radio pulses; (3) envelope detection is used. The principle of communications is confirmed experimentally in microwave band. Transmission rates up to 100 Mbps are demonstrated.

RING OSCILLATING SYSTEMS AND THEIR APPLICATION TO THE SYNTHESIS OF CHAOS GENERATORS

We consider in this paper a problem of the design of deterministic chaos generators with given spectral properties. It is shown that implementation of such generators is possible in the class of ring self-oscillating systems. Examples of the synthesis of systems with different types of spectrum are exhibited. The question of practical implementation of such generators is discussed.

Chaotic synchronization in ensembles of coupled maps

Synchronization modes are investigated in ensembles of interacting maps with chaos. For certain types of the map couplings, simple and rigorous conditions for chaotic synchronization are obtained, determined by only two parameters of order. The results of numerical simulation of the processes of chaotic mode establishment and destruction are presented.

Information processing using dynamical chaos: neural networks implementation

In this work, we study information processing applications of complex dynamics and chaos in neural networks. We discuss mathematical models based on piecewise-linear maps which enable us to realize the basic functions of information processing using complex dynamics and chaos. Realizations of these models using recurrent neural-like systems are presented.

ASSOCIATIVE AND RANDOM ACCESS MEMORY USING ONE-DIMENSIONAL MAPS

A method for storing and retrieving information on the stable cycles of one-dimensional maps as proposed in Dmitriev [1991], Dmitriev, Panas & Starkov [1991] is considered. The applicability of this method in storing and retrieving two-dimensional pictures is demonstrated. Possible extensions by compressing information are discussed. An implementation of random access memory using a one-dimensional map is also considered.

Ultrawideband wireless communications based on dynamic chaos

Basic ideas and concepts underlying the technology of ultrawideband wireless direct-chaos communications are presented. The factors of crucial importance for the development of this communications platform are considered. The models for the origin of chaos in different frequency bands are discussed. Effects of multipath propagation on ultrawideband chaotic signals are analyzed. The results of the experimental study of direct-chaos transmitters/receivers are presented.

EXPERIMENTS ON RF BAND COMMUNICATIONS USING CHAOS

This paper presents experimental results of wire-line and wireless analog information transmission in RF band via chaos using standard signal formation and reception methods.

Information processing in 1-D systems with chaos

Mathematical models are proposed, based on one-dimensional piecewise-linear maps, in which complex dynamics, bifurcation phenomena and chaos are used for information processing.

QUALITATIVE THEORY OF DYNAMICAL SYSTEMS, CHAOS AND CONTEMPORARY WIRELESS COMMUNICATIONS

This paper shows how the qualitative theory of dynamical systems, that is intensively developed during the last forty years, is currently applied in practice to provide effective wireless ultrawideband communications using chaotic information carrier.