Open AccessA coordinated non-orthogonal multiple access strategy for integrated terrestrial-satellite networks
Author(s) -
Qiang He,
Zheng Xiang,
Pinyi Ren
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0248173
Subject(s) - telecommunications link , computer science , time division multiple access , ergodic theory , channel (broadcasting) , relay , node (physics) , computer network , satellite , topology (electrical circuits) , expression (computer science) , scheme (mathematics) , telecommunications , mathematics , engineering , power (physics) , physics , electrical engineering , mathematical analysis , structural engineering , quantum mechanics , programming language , aerospace engineering
In this paper, we investigate the outage probability and ergodic sum capacity of the downlink of the integrated satellite-terrestrial networks (ISTN) with a cooperative non-orthogonal multiple access (CNOMA) scheme, in which a user with better channel condition acts as a relay node and forwards information to the other users. In this paper, a pilot-based channel estimation method is considered which can verify the performance of this scheme with the imperfect channel state information. In this model, all these users are equipped with multi-antennas, and all of them are both in the coverage of a same beam of the satellite. Specifically, the exact analytical expression for the outage probability and ergodic sum capacity of the system is derived. The result shows that this coordinated non-orthogonal multiple access (CNOMA) scheme performs better than that of OMA (TDMA) in this model. Finally, the future research directions are given to further enhance the system capacity.