• Serhii Kravchuk Doctor of engineering sciences, Professor of Telecommunication Systems Institute of National Technical University of Ukraine "Igor Sikorsky Kiev Polytechnic Institute", https://orcid.org/0000-0002-4118-0226
  • Liana Afanasieva Senior Lecture of Telecommunication Systems Institute of National Technical University of Ukraine "Igor Sikorsky Kiev Polytechnic Institute", https://orcid.org/0000-0002-9500-8034




cooperative relaying, auxiliary repeater, wireless data transmission system, link characteristics, wireless terminal.


Background. Improving the efficiency of modern wireless systems requires the development of new wireless technologies and the introduction of new paradigms for building wireless networks, one of which is a distributed approach to network architectures. An important role here is played by the interaction between the wireless terminals or terminals and the base station through additional relay terminals. An important technology that implements this interaction in order to increase the efficiency of communication in a cell is cooperative relaying.
Objective. The aim of the paper is to increase the efficiency of cooperative relaying schemes of information by filling all time phases/slots entering synchronous transmission through the pair number of repeaters.
Methods. We study the structural and functional methods of building a wireless network.
Results. In order to increase the capacity of the traditional cooperative relay scheme, a scheme is proposed with the addition of another auxiliary relay to the existing one so that each of the relays operates only during one of its data transmissions phases. Mathematical models of a number of cooperative relay schemes have been developed, which allow us to describe the main radio technical characteristics of the schemes (SNR, BER and C). It is proposed that a decision regarding the inclusion of traditional cooperative relaying should occur when a certain distance is reached between the source and the target receiver, when the capacity with and without cooperative relaying are equal. Connecting a cooperative relay scheme without a direct connection allows not only increasing the SNR value, but also maintaining its level only with a slight decrease.
Conclusions. A new scheme of cooperative relaying without maintaining a direct connection between the source terminals and the target receiver is proposed. Compared to the traditional cooperative relay scheme, such a scheme demonstrates more stable radio link characteristics over a wide range of attenuation changes between the source and target receiver terminals.


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