Abstract
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.
Highlights
In recent years, the satellite network is becoming more and more important for worldwide communication because of its global coverage, broadcasting capability and high bandwidth levels
This paper introduced a new scene where a base station directly communicates with user 1 (U1) while communicating with user 2 (U2) only through a relay, and use the non-orthogonal multiple access in this scene
A pilot-based channel estimation method is considered which can verify the performance of this scheme with the imperfect channel state information
Summary
The satellite network is becoming more and more important for worldwide communication because of its global coverage, broadcasting capability and high bandwidth levels. A coordinated non-orthogonal multiple access strategy for integrated terrestrial-satellite networks not serve multiple users, which limits the further improvement of spectrum efficiency and capacity of satellite networks. Proposed a new scheme which is called non-orthogonal slotted aloha This new scheme is used in the network which is TDMA-based random multiple access in internet of things satellite networks. Analytical formulas of outage probability and ergodic sum capacity are given and the result reveals that it can get better performance with this new strategy in this network. 1. Introduce the coordinated non-orthogonal multiple access strategy into a new scenario. Analytical expressions for outage probability of each stream for U1 and U2 are derived, and analytical expression for ergodic sum capacity is provided, too These two parameters can well reflect the performance of CNOMA in this new scenario. The simulation results are given to verify the impact of the imperfect channel state information
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