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Conference Paper
Uplink Timing Synchronization for Ofdma based Mobile Satellite Communications
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- Authors
- Hee Wook Kim, Kun Seok Kang, Do Seob Ahn
- Issue Date
- 2009-06
- Citation
- IET and AIAA International Communications Satellite Systems Conference (ICSSC) 2009, pp.1-6
- Language
- English
- Type
- Conference Paper
- Abstract
- One of the problems that faces OFDMA based mobile satellite system is generally timing synchronization between a satellite and users within the beam. In a terrestrial OFDMA system, propagation delays are relatively very small and the differential delays between users within a cell may be considered inconsequential. However, in a satellite OFDMA system, it is not negligible because round trip delay in GEO based system is 250 ms and the differential delays within a beam can be over 10 ms depending on a beam size. Therefore, in this paper, we propose uplink timing synchronization and uplink resource allocation methods for satellite OFDMA or SC-FDMA based communication considering very large differential delay between users within a beam, aiming at the reuse of terrestrial OFDMA based radio interface as a satellite radio interface. The proposed methods can bring latency reduction and throughput increase.
- KSP Keywords
- Beam size, Differential delay, Latency reduction, Mobile satellite communication, Propagation delay, Radio interface, Single carrier Frequency Division Multiple Access(SCFDMA), Uplink resource allocation, based system, mobile satellite system(MSS), round trip delay