V.G. Kartashevsky – Dr.Sc.(Eng.), Professor, Head of Department of Multiservices Networks and Information Security,

Volga State University of Telecommunications and Informatics (Samara)

E-mail: kartash@psati.ru

E.S. Semenov – Ph.D.(Eng.), Associate Professor, Head of Department of Telecommunication Systems, 

Volgograd State University

E-mail: essemenov@mail.ru

K.S. Slipenchuk – Deputy Head, Volga State University of Telecommunications and Informatics (Samara) E-mail: slipenchuk-ks@psuti.ru

A.A. Filimonov – Engineer, Volga State University of Telecommunications and Informatics (Samara) E-mail: Alfhero@gmail.com

The algorithm of reception of signals of orthogonal frequency multiplexing (OFDM) in channels with dispersion and fast fading is considered. A new structure of the OFDM symbol consisting of a test pattern is proposed, the information content of which is known at the receiving location and, so-called «work packet», where the message symbols are transmitted. This structure under conditions of a rapidly changing channel has better characteristics of noise immunity in comparison with the traditional structure of a group signal. The modulation is carried out by a QPSK modulator. The use of the algorithm «reception in the whole» with element-wise decision-making allows you to abandon the use of prefixes and postfixes in the structure of the OFDM symbol, which leads to an increase in bandwidth.

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2. Kartashevskij V.G. Obrabotka prostranstvenno-vremenny'x signalov v kanalax s pamyat'yu. M.: Radio i svyaz'. 2000. 272 s.
3. Kartashevskij V.G., Bel'skij K.A., Slipenchuk K.S. Priem signalov OFDM v kanalax s rasseyaniem // Radiotexnika. 2015. № 2. S. 62−68.
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