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<p>Orthogonal Time–Frequency Space (OTFS) modulation demonstrates enhanced performance in high-mobility wireless situations and significant performance benefits over Delay-Doppler relative to Orthogonal Frequency Division Multiplexing (OFDM). This paper focuses on adhesive Maximal Ratio Combining (MRC) detector with oversampling in the presence of Doppler shifts and fractional delays. Discrete time-based channel model with additive noise is used to represent the OTFS system in oversampling condition. In the context of OTFS transmission utilizing rectangular pulses, we establish a comprehensive channel input–output relationship within the Delay-Doppler domain. This derivation is conducted without depending on unrealistic assumptions, such as the use of ideal bi-orthogonal pulses and the presence of on-the-grid delay/Doppler&#xa0;shifts. Simulation results shows that for 4QAM, 8QAM, 16QAM, the proposed adhesive MRC detector with oversampling factor 8 performs better and for 32QAM, 64QAM, 128QAM, 256QAM, and 512QAM adhesive MRC detector with oversampling factor 4 shows superior BER&#xa0;performance.</p>

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A low-complexity adhesive MRC detector for an oversampling-reliant OTFS receiver

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Afreen Kubra,
  • S. Safinaz

摘要

Orthogonal Time–Frequency Space (OTFS) modulation demonstrates enhanced performance in high-mobility wireless situations and significant performance benefits over Delay-Doppler relative to Orthogonal Frequency Division Multiplexing (OFDM). This paper focuses on adhesive Maximal Ratio Combining (MRC) detector with oversampling in the presence of Doppler shifts and fractional delays. Discrete time-based channel model with additive noise is used to represent the OTFS system in oversampling condition. In the context of OTFS transmission utilizing rectangular pulses, we establish a comprehensive channel input–output relationship within the Delay-Doppler domain. This derivation is conducted without depending on unrealistic assumptions, such as the use of ideal bi-orthogonal pulses and the presence of on-the-grid delay/Doppler shifts. Simulation results shows that for 4QAM, 8QAM, 16QAM, the proposed adhesive MRC detector with oversampling factor 8 performs better and for 32QAM, 64QAM, 128QAM, 256QAM, and 512QAM adhesive MRC detector with oversampling factor 4 shows superior BER performance.