Robust Symbol Timing Synchronization for Initial Access under LEO Satellite Channel

This paper proposes a robust symbol timing synchronization scheme for return link initial access based on the Digital Video Broadcasting-Return Channel via Satellite 2nd generation (DVB-RCS2) system for the Low Earth Orbit (LEO) satellite channel. In most cases, the feedforward estimator structure i...

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Vydáno v:Sensors (Basel, Switzerland) Ročník 23; číslo 19; s. 8320
Hlavní autoři: Kim, Pansoo, Park, Hyuncheol
Médium: Journal Article
Jazyk:angličtina
Vydáno: Basel MDPI AG 01.10.2023
MDPI
Témata:
Algorithms
Communications networks
demodulator
Digital video
Doppler
DVB-RCS2
LEO satellite
Low earth orbit satellites
Non-Terrestrial Network (NTN)
Satellite communications
Simulation methods
Software
Spread spectrum
symbol timing recovery (STR)
ISSN:1424-8220, 1424-8220
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Shrnutí:This paper proposes a robust symbol timing synchronization scheme for return link initial access based on the Digital Video Broadcasting-Return Channel via Satellite 2nd generation (DVB-RCS2) system for the Low Earth Orbit (LEO) satellite channel. In most cases, the feedforward estimator structure is considered for implementing Time Division Multiple Access (TDMA) packet demodulators such as the DVB-RCS2 system. More specifically, the Non-Data-Aided (NDA) approach, without using any kind of preamble, pilot, and postamble symbols, is applicable for fine symbol timing synchronization. However, it hinders the improvement in estimation accuracy, especially when dealing with short packet lengths during the initial access from the User Terminal (UT) to the Gateway (GW). Moreover, when a UT sends a short random access packet for initial access or resource request to the LEO satellite channel, the conventional schemes suffer from a large Doppler error depending on UT’s location in a beam and satellite velocity. To ameliorate these problems, we propose a novel symbol timing synchronization algorithm for GW, and its advantage is confirmed through computer simulation.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s23198320