PAPR mitigation based on superimposed training scheme in time-varying underwater acoustic OFDM communications

Yingqiao Cui; Zhenduo Wang; Pengyu Du

doi:10.1117/12.2644451

20 January 2023 PAPR mitigation based on superimposed training scheme in time-varying underwater acoustic OFDM communications

Yingqiao Cui, Zhenduo Wang, Pengyu Du

Author Affiliations +

Proceedings Volume 12562, AOPC 2022: Optical Information and Networks; 1256206 (2023) https://doi.org/10.1117/12.2644451
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

Peak-to-average power ratio (PAPR) is a hot issue in orthogonal frequency division multiplex (OFDM) technology. High PAPR of OFDM system limits its application in underwater acoustic communications. The DFT-s-OFDM technology has been widely used in long term evolution (LTE) and fifth-generation new radio (5G NR) uplink transmission schemes for wireless communications due to its good PAPR performance. However, it is difficult to adapt to time-varying underwater acoustic channels by using time-multiplexed training. We use the DFT-s-OFDM technology of the sideband tone reservation method to suppress the PAPR of the system. At the same time, for the DFT-s-OFDM system, it is impossible to insert data and pilots in a single symbol block at the same time to track the channels. A low-power training sequence is superimposed with symbols, and the training sequence is transmitted over all time. It is used to enhance the tracking channel capability with a small energy overhead and is used to process time-varying channels. Field experiments were carried in Qiandao Lake in 2021, and the results verify the effectiveness of the proposed scheme.

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Yingqiao Cui, Zhenduo Wang, and Pengyu Du "PAPR mitigation based on superimposed training scheme in time-varying underwater acoustic OFDM communications", Proc. SPIE 12562, AOPC 2022: Optical Information and Networks, 1256206 (20 January 2023); https://doi.org/10.1117/12.2644451

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KEYWORDS

Orthogonal frequency division multiplexing

Doppler effect

Acoustics

Telecommunications

Signal to noise ratio

Transmitters

Factor analysis

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