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<p>The orthogonal frequency division multiplexing (OFDM) is a prominent modulation technique used in modern communication systems. In OFDM, the wireless channel is modeled as an inter-symbol interference (ISI) channel, not considering the channel reflectors’ Doppler component. This results in serious performance degradation in doubly spread multipath channels. This paper proposes a channel estimation scheme for OFDM to estimate the delay-Doppler (DD) domain, thus overcoming this shortcoming. The proposed technique is inspired by the orthogonal time frequency space (OTFS) waveform structure, a two-dimensional modulation technique designed to handle wireless communication in high-mobility scenarios. The principles of convex optimization and active constellation extension (ACE) optimize the signal in both the time-frequency (TF) and DD domains. The proposed approach strengthens OFDM performance against mobility-induced impairments, thereby enabling OFDM to achieve BER performance comparable to OTFS in high-mobility scenarios. A comparative study of the proposed method with three popular techniques for channel estimation in OTFS, namely impulse-based estimation, embedded pilot-based estimation, and orthogonal matching pursuit (OMP)-based estimation was performed. The efficacy of the proposed technique is illustrated with Monte Carlo simulations.</p>

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OTFS-inspired joint channel and data estimation for OFDM

  • 期刊论文

  • 发表日期：

    2025年12月9日

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  • Basil K. Jeemon,
  • Shahana T. K

摘要

The orthogonal frequency division multiplexing (OFDM) is a prominent modulation technique used in modern communication systems. In OFDM, the wireless channel is modeled as an inter-symbol interference (ISI) channel, not considering the channel reflectors’ Doppler component. This results in serious performance degradation in doubly spread multipath channels. This paper proposes a channel estimation scheme for OFDM to estimate the delay-Doppler (DD) domain, thus overcoming this shortcoming. The proposed technique is inspired by the orthogonal time frequency space (OTFS) waveform structure, a two-dimensional modulation technique designed to handle wireless communication in high-mobility scenarios. The principles of convex optimization and active constellation extension (ACE) optimize the signal in both the time-frequency (TF) and DD domains. The proposed approach strengthens OFDM performance against mobility-induced impairments, thereby enabling OFDM to achieve BER performance comparable to OTFS in high-mobility scenarios. A comparative study of the proposed method with three popular techniques for channel estimation in OTFS, namely impulse-based estimation, embedded pilot-based estimation, and orthogonal matching pursuit (OMP)-based estimation was performed. The efficacy of the proposed technique is illustrated with Monte Carlo simulations.