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Researchers and scientists believe that around 2030’s 6G communications may evolve and deploy in some parts of the world. For that existing orthogonal frequency division multiplexing (OFDM) modulation scheme is not providing the optimal performance. A new modulation waveform orthogonal time-frequency space (OTFS) is developed recently to provide optimal performance in highly time-varying scenarios. Compared to OFDM, OTFS provides better spectral efficiency and reliability but requires huge power to transmit the signal over the air. A novel companding technique is applied to the OTFS waveform to reduce the peak power. This companding transform reduces the peak power and maintains the same average power; hence, the peak-to-average power ratio (PAPR) reduces. To verify the effectiveness of the proposed companding technique, simulations are performed in view of PAPR and bit error rate (BER). Simulation results show that the proposed companded OTFS yields better performance relative to the \(\mu -\) law companded OTFS.

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A Novel Companding Transform for Reduction of PAPR in OTFS Signal

  • 会议论文

  • 发表日期：

    2025年

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  • Hanumantharao Bitra,
  • Kasturi B. V. S. V. Suhash,
  • S. Gokul Akash

摘要

Researchers and scientists believe that around 2030’s 6G communications may evolve and deploy in some parts of the world. For that existing orthogonal frequency division multiplexing (OFDM) modulation scheme is not providing the optimal performance. A new modulation waveform orthogonal time-frequency space (OTFS) is developed recently to provide optimal performance in highly time-varying scenarios. Compared to OFDM, OTFS provides better spectral efficiency and reliability but requires huge power to transmit the signal over the air. A novel companding technique is applied to the OTFS waveform to reduce the peak power. This companding transform reduces the peak power and maintains the same average power; hence, the peak-to-average power ratio (PAPR) reduces. To verify the effectiveness of the proposed companding technique, simulations are performed in view of PAPR and bit error rate (BER). Simulation results show that the proposed companded OTFS yields better performance relative to the \(\mu -\) law companded OTFS.