RESEARCH OF OFDM SIGNAL EFFICIENCY IN LATEST GENERATION MOBILE NETWORKS UNDER INTERFERENCE

DOI: 10.31673/2786-8362.2025.029306

Abstract

The article
investigates the impact of subscriber mobility and frequency shifts on the behavior of multicarrier signals
in modern wireless networks using OFDM approaches as an example. The mechanisms through which
changes in speed and frequency synchronization errors lead to the appearance of intersymbol and
intercarrier interference, as well as to degradation of reception quality, are considered. Based on analytical
considerations, an approach is proposed for evaluating the trade-off between desired spectral efficiency and
signal stability in conditions of user mobility. The concept of adapting the parameters of the multi-carrier
signal depending on channel conditions and mobility is described, and practical methods that can reduce
the negative effects of frequency shifts are discussed, from improving frequency localization to the use of
adaptive signal processing schemes. It is emphasized that optimal solutions depend on the usage scenario
and must take into account compatibility with existing standards and hardware limitations.
Keywords: LTE, OFDM, MIMO, Doppler effect, spectral efficiency

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