Sergey Olegovich Starkov

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.

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.

Multiple access communication based on control of special chaotic trajectories

The necessity of simultaneous access to one communication channel by many users, has led to the development of the corresponding standards: FDMA, TDMA and CDMA. In multiple-access systems, chaotic signals are used only as efficient and versatile means of quasi-noise signal formation. In such applications, important and attractive features, such as multitude of chaotic modes, flexible control of their dynamics, chaotic self-synchronization phenomena, and potential communication confidence due to the very dynamic properties of chaotic nonlinear systems, are neglected. Here we discuss another principle of multiple access, based on the fine structure of chaotic attractor, using control of special chaotic trajectories. We also demonstrate the experimental verification of the proposed approach for asynchronous packet data transmission.