Simulation Analysis of Orthogonal Frequency Division Multiplexing Systems Under High Mobility Conditions

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@article{1709846,
      author = {Andrew Adagbor Okwoche, Gertrude Fischer , Utoda Reuben Agim},
      title = {Simulation Analysis of Orthogonal Frequency Division Multiplexing Systems Under High Mobility Conditions},
      journal = {Iconic Research And Engineering Journals},
      year = {2025},
      volume = {9},
      number = {1},
      pages = {1732-1737},
      issn = {2456-8880},
      url = {https://www.irejournals.com/formatedpaper/1709846.pdf},
      abstract = {This study offers a detailed simulation-based analysis of how Orthogonal Frequency Division Multiplexing (OFDM) systems perform under high-mobility conditions, with a particular focus on the impact of Doppler effects at different vehicular speeds using MATLAB. The results clearly show the toll that high mobility takes on OFDM performance. At 0 km/h, the average BER was an impressively low 0.00015, but it surged to 0.0678 at 350 km/h a more than 400-fold increase. EVM also rose steeply, from just 3.4% to 26.7%, and ICI power increased dramatically with Doppler frequency, reaching about 9.5 dB at top speeds. As channel coherence time dropped below 1.2 ms, rapid channel fluctuations made accurate demodulation increasingly difficult. Constellation diagrams showed noticeable symbol smearing above 200 km/h, further confirming the disruptive effects of Doppler spread. Meanwhile, spectral efficiency fell from 3.98 bps/Hz at low speeds to 2.41 bps/Hz at high mobility. The findings highlight that conventional OFDM systems, if left un-adapted, are highly vulnerable to performance degradation in fast-moving environments. These insights are crucial for the design of next-generation 5G and 6G communication systems tailored for vehicles and high-speed trains.},
      keywords = {OFDM Systems, Doppler Effect, Mobility Condition, Inter-Carrier Interference},
      month = {July},
  }