Patent EA-005266-B1 (EA)
Title: Method for transmitting data by means of chaotic signals
Inventor: DMITRIEV ALEXANDER SERGEEVICH
IPC: H04J13/00
Filed: 2000-07-27
Abstract: 1. A method for transmitting information using chaotic signals, said method comprises steps of: at the transmitting side, forming a wide-band information carrier within a predetermined information transmission bandwidth; modulating the information carrier with an information signal; transmitting the modulated information carrier via a communication channel from the transmitting side to the receiving side; at the receiving side, demodulating the received information carrier to extract the information signal; characterizing in that: performing said step of forming a wide-band information carrier by means of a chaotic dynamic system which structure is synthesized beforehand according to predetermined characteristics of said wide-band information carrier; in said step of synthesizing said chaotic dynamic system, revealing parameter regions of said system, which parameters ensure a uniform behavior of said chaotic dynamic system; selecting, on the basis of said identified parameter regions, parameter values for this chaotic dynamic system, which values ensure the step of forming said wide-band information carrier in the form of a chaotic information carrier having at least required spectrum characteristics; performing said step of modulating by means of forming, in accordance with the information signal, chaotic radio or optical pulses having a predetermined duration with predetermined time intervals between these pulses, and then transmitting the thus modulated information carrier via the communication channel; performing said step of receiving and demodulating at the receiving side by means of a dynamic system matched in its behavior with said chaotic dynamic system at the transmitting side. 2. The method according to Claim 1, characterizing in that a dynamic self-oscillating system with at least one active element and a supplementary frequency-selective structure for forming said wide-band information carrier are used as said chaotic dynamic system. 3. The method according to Claim 2, characterizing in that said dynamic self-oscillating system is supplemented with control components for selecting a mode of forming said wide-band information carrier and/or forming said chaotic radio or optical pulses and intervals between them. 4. The method according to Claim 2, characterizing in that said step of forming said radio or optical pulses and intervals between them is performed in a supplementary feedback circuit of said dynamic self-oscillating system. 5. The method according to Claim 1, characterizing in that said step of forming radio or optical pulses with predetermined duration and time intervals between them is performed by controlling a behavior of said chaotic dynamic system. 6. The method according to Claim 5, characterizing in that said step of controlling the behavior of said chaotic dynamic system is performed by controlling a change of parameters of said chaotic dynamic system. 7. The method according to Claim 5, characterizing in that said step of controlling the behavior of said chaotic dynamic system is performed by controlling the trajectory of the representative point in the phase state space of said chaotic dynamic system. 8. The method according to Claim 7, characterizing in that said step of controlling the trajectory is performed by changing initial conditions of an actuation of said chaotic dynamic system. 9. The method according to Claim 7, characterizing in that said step of controlling the trajectory is performed by holding the trajectory of the representative point in the phase state space of said chaotic dynamic system in a predetermined area of said phase state space during a predetermined time period. 10. The method according to Claim 1, characterizing in that durations of said chaotic radio or optical pulses and/or intervals between them are formed using chaotic samples generated by a supplementary chaotic dynamic system, and an input information to be transmitted. 11. The method according to Claim 1, characterizing in that said step of receiving and demodulating at the receiving side is performed using a chaotic dynamic system which behavior is at least partly synchronized with a chaotic signal of said chaotic dynamic system at the transmitting side. 12. The method according to Claim 1, characterizing in that said step of receiving and demodulating at the receiving side is performed using a chaotic dynamic system which output signal is matched with an envelope of the signal of said chaotic dynamic system at the transmitting side.