I.М. Lerner1, R.R. Fayzullin2, D.V. Shushpanov3, V.I. Il’in4, I.V. Ryabov5, А.N. Khairullin6

1,2,6 Kazan National Research Technical University A.N. Tupolev – KAI (Kazan, Russia)

3 St. Petersburg State University of Telecommunications. prof. M.A. Bonch-Bruevich (St. Petersburg, Russia)

4 Kazan (Privolzhsky) Federal University (Kazan, Russia)

5 Volga State Technological University (Yoshkar-Ola, Russia)

The method development that provides an increase in the specific capacity is one of the central problems of radio engineering and communication theory. At presents, the key factor that limits its solution at present is ISI produced by the frequency selectivity of a real composite communication channel.

To overcome this factor, the following classes of radio engineering information transmission systems are used: 1st class, in which information is transmitted in parallel and is implemented using the technology of multiplexing with orthogonal frequency division of channels and / or with space-time coding; 2) in which the transmission is carried out in a sequential manner, and the receiving of signals is carried out under conditions of ISI, including at information transfer rates higher than the Nyquist rate.

Despite the fact that at present the first class of systems has found wide application in the field of high-speed information transmission, it has a number of significant drawbacks in relation to the second systems class. At the same time, a number of results of the practical use of first-class systems indicate that their specific capacity limitation is about 4 bit/Hz·s, which, taking into account the existing growth in the volume of transmitted information, becomes insufficient in the near future.

Retrospective analysis of methods for receiving and processing information in phase radio engineering systems for serial data transmitting in frequency selective communication channels with ISI, in order to develop approaches to increasing their specific capacity.

The results are presented for solving the second and third of the tasks set in the first article, related to the critical analysis of methods for capacity estimating in frequency-selective communication channels in the presence of ISI, in order to choose the best of them for determining the symbol duration of PSK-n- and APSK- N-signals for the implementation of the first form of such systems, as well as for evaluating the possibility of increasing their specific capacity due to the complex frequency response of the communication channel.

The practical significance lies in determining the best method for estimating the specific capacity, symbol duration and signal constellation, which allow you to dynamically control the operation of the communication system.

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