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학술지 Direct Sequence Spectrum Spreading Techniques for Next Generation Mobile Broadband Satellite Services
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김판수, Alessandro Vanelli Coralli, Marco Villanti, Raffaella Pedone, Stefano Cioni, Massimo Neri, Claudio Palestini, Marco Papaleo, 이호진, Giovanni Emanuele Corazza
International Journal of Satellite Communications and Networking, v.28 no.3-4, pp.157-181
John Wiley & Sons
09MR6900, 고효율 위성 리턴링크 접속 핵심기술 개발, 장대익
The recently approved mobile version of the Digital Video Broadcasting Return Channel via Satellite (DVB-RCS+M) foresees the use of direct sequence spectrum spreading (DS-SS) in the forward link. The addition of a spreading mode, on top of the conventional time division signaling structure of the fixed DVB-S2, allows in fact for the efficient extension of DVB-S2 to mobile terminals with small aperture antennas operating in Ku (11-14 GHz) and Ka (20-30 GHz) bands. Spectrum spreading has been introduced to augment the received energy without increasing the transmitted power density, which is limited by regulatory constraints, and to enhance the waveform resilience to co-channel interference. In this paper, we report on the design and assessment of the DS-SS technique that we carried out for its inclusion in the DVB-RCS+M standard. In particular, by comparing the physical layer performance of the spread and nonspread modes in the specific DVB-RCS+M mobile scenarios, we show that the proposed DS-SS technique has no impact on the DVB-RCS+M data detection performance, while satisfying the requirements on interference resilience and received energy augmentation. In order to deal with the acquisition issues raised by the introduction of the DS-SS technique, we then propose and evaluate several synchronization sub-systems able to deal with the specific impairments of the mobile satellite scenarios, that is, large frequency offsets, phase noise, link obstructions, etc. Finally, a possible implementation of the DS-SS technique that fully accommodates the reuse of the specific hardware compatible with conventional DVB-S2 is also reported. Copyright © 2009 John Wiley & Sons, Ltd.
KSP 제안 키워드
30 GHz, Aperture antennas, DVB-RCS, DVB-S2, Data Detection, Digital video broadcasting, Direct-sequence(DS), Direct-sequence spread-spectrum(DSSS), Forward link, Mobile satellite, Next Generation Mobile Broadband(NGMB)