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Timing Advance Estimation in Low Earth Orbit Satellite Networks by Zhu, Jianfeng; Sun, Yaohua; Peng, Mugen is a scholarly article available to read on EtoBox.

What is Timing Advance Estimation in Low Earth Orbit Satellite Networks about?

Low earth orbit (LEO) satellite communication based on 3GPP standard is seen as a promising solution to rolling out communication services in areas without terrestrial base stations. However, due to the fast movement of satellites and large beam footprint size, the existing 5G timing advance (TA) estimation mechanism cannot be directly applied when global navigation satellite system is unavailable. In this article, an enhanced TA estimation approach is proposed for LEO satellite communication networks. Specifically, a user-side time-frequency pre-compensation method is introduced at first, which leverages frequency offset measurement on synchronization signal blocks broadcasted by satellites in initial cell search phase. For the random access phase, the upper bound of inter-preamble interference incurred by partial-period cross-correlation operations is derived for a preamble format advised by 3GPP, and it is shown that the interference level is closely related to the square of the number of such operations. Inspired by this result, a cyclic prefix free preamble format is further designed, which features extended guard time, differential power allocation and flexible preamble struc

Author

Zhu, Jianfeng; Sun, Yaohua; Peng, Mugen

Published

2024

Language

EN