상세정보
학술대회
Uplink Timing Synchronization for Ofdma based Mobile Satellite Communications
- 발행일
- 200906
- 출처
- IET and AIAA International Communications Satellite Systems Conference (ICSSC) 2009, pp.1-6
- 협약과제
- 09MR4600, IMT-Advanced 위성접속 기술개발(표준화연계), 안도섭
- 초록
- 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 제안 키워드
- Beam size, Differential delay, Mobile satellite communication, Propagation delay, Radio interface, Single carrier Frequency Division Multiple Access(SCFDMA), Uplink resource allocation, based system, latency reduction, mobile satellite system(MSS), resource allocation(RA)