B. Khuc1, A.L. Gelgor2, T.E. Gelgor3, V.A. Vargauzin4, S.V. Rozov5

1–5 Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

1 huk.tb@edu.spbstu.ru; 2 agelgor@spbstu.ru; 3 tanya.gelgor@yandex.ru; 4 vargauzinhn@gmail.com; 5 svroz@ya.ru

Formulation of the problem. In the 5G New Radio (5G NR) and Long-Term Evolution (LTE) mobile communication systems, the use of Orthogonal Frequency Division Multiplexing (OFDM) is provided alongside other advanced technologies, including Filter-Bank Multi-Carrier with Offset QAM (FBMC/OQAM), Generalized Frequency Division Multiplexing (GFDM), Filtered – Orthogonal Frequency Division Multiplexing (F-OFDM), and Orthogonal Time Frequency Space (OTFS). Among these modulation methods, such as FBMC/OQAM, GFDM, F-OFDM, significantly lower levels of Out-of-Band Emission (OOBE) are observed compared to OFDM (FBMC/OQAM has the lowest OOBE level). However, like OFDM, in scenarios with highly mobile channels, the performance of these modulation methods is significantly reduced due to inter-carrier and inter-symbol interference.

In contrast, the OTFS modulation method ensures high data transmission efficiency in high-mobility channel conditions, although it has a high level of OOBE like OFDM. The use of the FBMC/OQAM modulation method with OTFS preprocessing is an effective mean of simultaneously addressing issues with OOBE and stability in scenarios with highly mobile channels.

Objective. To evaluate the effectiveness of using FBMC/OQAM signals with OTFS preprocessing in high-mobility scenarios in the 5G NR mobile communication system based on simulation modeling.

Results. A simulation model of the 5G NR system has been developed based on the FBMC/OQAM modulation method with OTFS preprocessing (FBMC/OQAM-OTFS). Using the proposed model in the MATLAB environment, an investigation was conducted into the effectiveness of FBMC/OQAM-OTFS signals in terms of Out-of-Band Emission (OOBE) levels, reception robustness in scenarios with highly mobile channels, and the computational complexity of implementation. The results show that the application of the FBMC/OQAM-OTFS modulation method significantly reduces the OOBE level (from 12.2 to 112.3 dB) and provides high energy savings (from 0.7 to 5.6 dB depending on channel models) compared to signals with CP-OFDM. However, in terms of computational complexity, the implementation of the FBMC/OQAM-OTFS modulation method is much higher (from 4 times to 14 times) than other modulation methods (OFDM, OTFS). The issue of high computational complexity in the FBMC/OQAM-OTFS scheme can be addressed by employing a polyphase structure.

Practical significance. The obtained results indicate the feasibility of employing FBMC/OQAM-OTFS signals in the 5G NR mobile communication system. Additionally, proposing FBMC/OQAM-OTFS signals for use in next-generation mobile communication systems is recommended.

Khuc B., Gelgor A.L. Gelgor T.E., Vargauzin V.A., Rozov S.V. Evaluation of the effectiveness of using FBMC/OQAM signals with OTFS preprocessing in 5G NR for high-mobility channel scenarios. Radiotekhnika. 2024. V. 88. № 3. P. 78−91. DOI: https://doi.org/10.18127/j00338486-202403-08 (In Russian)

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