IMPROVED EFFICIENCY OF DATA TRANSMISSION
IN WIRELESS COMMUNICATION SYSTEMS
WITH ORTHOGONAL FREQUENCY MULTIPLEXING
Olga E. Safonova
Candidate of Sciences (Economics), Associate Professor,
Department of Telecommunication Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Elena E. Arepyeva
Candidate of Sciences (Economics), Associate Professor,
Department of Telecommunication Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Nadezhda N. Ermakova
Assistant, Department of Telecommunication Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Abstract. The active introduction of Orthogonal Frequency Division Multiplexing (OFDM) technology is now beginning to be widely used in wireless transmission systems, television, radio communication, and radio broadcasting. The efficiency of using a dedicated frequency band at a constant high transmission rate allows you to combat interference arising from the transmission of a useful information on the radio channel. A method of improving quality of information transmission in communication systems with orthogonal frequency multiplexing is described. It is shown that with an increase in the number of receiving and transmitting antennas, the noise immunity increases significantly. An experiment was carried out to change the number of receiving-transmitting antennas and the signal-to-noise ratio, and the dependence of the appearance of an error on the number of transmitting antennas was obtained. The work investigated the software model of MIMO OFDM (modulators and demodulators). As a result of the analysis, the dependence of the appearance of the error frequency on the probability of the error was obtained. This showed that the use of OFDM and MIMO places increased demands on channel estimation.
Key words: orthogonal frequency multiplexing, MIMO, frequency band, transmission efficiency, communication systems.
This work is licensed under a Creative Commons Attribution 4.0 International License.
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