Application of Non-Orthogonal Multiple Access Scheme for Satellite Downlink in Satellite/Terrestrial Integrated Mobile Communication System with Dual Satellites

Eiji OKAMOTO  Hiroyuki TSUJI  

IEICE TRANSACTIONS on Communications   Vol.E99-B   No.10   pp.2146-2155
Publication Date: 2016/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016ATP0011
Type of Manuscript: Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2015)
satellite/terrestrial integrated mobile communication system,  multi-satellite,  non-orthogonal multiple access,  proportional fair scheduling,  downlink,  

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In satellite/terrestrial integrated mobile communication systems (STICSs), a user terminal directly connects both terrestrial and satellite base stations. STICS enables expansion of service areas and provides a robust communication service for large disasters. However, the cell radius of the satellite system is large (approximately 100km), and thus a capacity enhancement of the satellite subsystem for accommodating many users is needed. Therefore, in this paper, we propose an application of two methods — multiple-input multiple-output (MIMO) transmission using multi-satellites and non-orthogonal multiple access (NOMA) for STICS — to realize the performance improvement in terms of system capacity and user fairness. Through numerical simulations, we show that system capacity and user fairness are increased by the proposed scheme that applies the two methods.