ANALYSIS OF DISCRETE MESSAGE TRANSMISSION
IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEMS
Osama Jaber Ghaib Al-Qadi
Postgraduate Student, Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Bertus Aminaggia Tazifua
Student, Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Evgeniy S. Semenov
Candidate of Sciences (Engineering), Associate Professor,
Head of the Department of Telecommunications Systems,
Volgograd State University
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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation
Abstract. High data transfer rates are required in modern digital radio transmission systems. But an increase in the data transfer rate leads to a deterioration in the transmission quality and a high BER (bit error rate). OFDM technology, which was introduced in the 1960s, implements all these functions. In this paper, the influence of fading channels on the transmission of information in OFDM systems is investigated. In wireless systems for transmitting discrete messages, the channel parameters greatly affect the transmission quality, as interference, noise and fading affect the useful signal. Fading is a very common phenomenon in wireless communication systems, affecting the phase shift of the signal. In an urban environment, multipath propagation of signals also takes place, since signals propagate along two or more paths before reaching the receiver. Depending on the signal propagation medium and communication conditions, small-scale fading can be distinguished. At the same time, there are significant changes in the amplitude and phase of the signal. Small-scale fading occurs on a smaller scale, comparable to the wavelength of the transmitted signal, and often changes throughout the signal path, and may change one or more times during the transmission time of the symbol, which leads to so-called flat (smooth) and frequency-selective fading. The results obtained show the effect of fading on the digital transmission system (OFDM). The three discrete message delay profiles used represent a low-, medium-, and high-latency propagation environment, respectively. A model of a wireless digital communication system (OFDM) has been built using the SystemVue software.
Key words: signal, modulation, data analysis, signal constellation, interference, digital transmission system (OFDM), SystemVue.
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