Code division of signals in a direct chaotic scheme of information transmission

An important direction in the scientific activity of Yu. V. Gulyaev is research and development in the field of nonlinear dynamics and dynamic chaos. As for nonlinear dynamics in general, all the main areas of Yuri Vasilyevich’s scientific activity relate to it to one degree or another, starting with classical works in the field of acoustoelectronics. Here, of course, it is necessary to mention research in the field of proper physical fields of biological objects, work in the field of medical electronics, as well as research and development in the field of dynamic chaos and its applications. One such development, which essentially laid the foundation for the development of direct-chaotic transceivers, in the formulation and implementation of which Yuri Vasilyevich played an important role, is described in the introduction to that article. This work was largely a prologue to the development of work on information transmission using dynamic chaos, carried out at IRE RAS since the 90s. The main part of the article proposes and examines a new version of a direct-chaotic information transmission scheme, in which code sequences of chaotic radio pulses are used as an information-carrying signal. Objectives. Development of a new method for introducing information into a chaotic signal, providing expanded capabilities for channel separation and multiple access. Methods. Computer simulation of the transmission process and theoretical estimates of the noise immunity of the scheme in a channel with white noise. Results. A method for modulation/demodulation of code sequences of chaotic radio pulses is proposed and investigated, which provides an increase in the base of the transmitted binary symbol and channel division based on correlation processing of the signal passed through the envelope detector. It is shown that the proposed modulation/demodulation scheme is also effective for organizing multiple access in a network of transceivers that are not synchronized with each other. Conclusion. The proposed scheme for inputting information into a direct chaotic signal of the transmitter and its extraction on the receiver side, judging by theoretical calculations and the results of computer simulation, significantly increases the capabilities of direct chaotic communication facilities and expands the areas of their application.