Non-terrestrial networks will play a crucial role in future wireless 6G systems to ensure ubiquitous connectivity and to complement terrestrial networks. With reference to a low Earth orbit (LEO) constellation, this letter performs a comparison in terms of pragmatic capacity between the orthogonal frequency division multiplexing (OFDM) and the orthogonal time frequency space (OTFS) modulation in a scenario where multi-satellite diversity is employed to ensure a more uniform throughput and to increase the system reliability against unforeseen blockages. The considered scenario is akin to a cell-free system, wherein each user may be jointly served by multiple satellites for better and more stable performance. Numerical results reveal that multi-satellite diversity is effective in increasing the link performance and that OTFS provides a better performance and is thus more robust to the impairments caused by the heavy Doppler shifts.

LEO Satellite Diversity in 6G Non-Terrestrial Networks: OFDM vs. OTFS / Buzzi, Stefano; Caire, Giuseppe; Colavolpe, Giulio; D’Andrea, Carmen; Foggi, Tommaso; Piemontese, Amina; Ugolini, Alessandro. - In: IEEE COMMUNICATIONS LETTERS. - ISSN 1089-7798. - 27:11(2023), pp. 3013-3017. [10.1109/LCOMM.2023.3320793]

LEO Satellite Diversity in 6G Non-Terrestrial Networks: OFDM vs. OTFS

Caire, Giuseppe;Colavolpe, Giulio;Foggi, Tommaso;Piemontese, Amina;Ugolini, Alessandro
2023-01-01

Abstract

Non-terrestrial networks will play a crucial role in future wireless 6G systems to ensure ubiquitous connectivity and to complement terrestrial networks. With reference to a low Earth orbit (LEO) constellation, this letter performs a comparison in terms of pragmatic capacity between the orthogonal frequency division multiplexing (OFDM) and the orthogonal time frequency space (OTFS) modulation in a scenario where multi-satellite diversity is employed to ensure a more uniform throughput and to increase the system reliability against unforeseen blockages. The considered scenario is akin to a cell-free system, wherein each user may be jointly served by multiple satellites for better and more stable performance. Numerical results reveal that multi-satellite diversity is effective in increasing the link performance and that OTFS provides a better performance and is thus more robust to the impairments caused by the heavy Doppler shifts.
2023
LEO Satellite Diversity in 6G Non-Terrestrial Networks: OFDM vs. OTFS / Buzzi, Stefano; Caire, Giuseppe; Colavolpe, Giulio; D’Andrea, Carmen; Foggi, Tommaso; Piemontese, Amina; Ugolini, Alessandro. - In: IEEE COMMUNICATIONS LETTERS. - ISSN 1089-7798. - 27:11(2023), pp. 3013-3017. [10.1109/LCOMM.2023.3320793]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2964434
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