Abstract
Satellite communication systems need to be integrated with emerging small-cell network to provide seamless connectivity and high-speed broadband access for mobile users in future wireless networks. In this paper, we study a hybrid satellite-terrestrial relay system (HSTRS) employing small cell transmission under interference constraint with macro-cell users. To characterize such HSTRS-assisted small-cell network, Shadowed-Rician fading for satellite links and Nakagami-$m$ fading for terrestrial links are adopted. We further deploy non-orthogonal multiple access (NOMA) to improve spectrum efficiency. To provide performance analysis, we derive exact formulas for outage probability and throughput of the considered HSTRS, and further examine its achievable diversity order. More importantly, we conduct the performance analysis by indicating performance gaps among two users, and such a gap depends on power allocation factors. We evaluate key performance metrics through the derived analytical expressions to provide useful framework of HSTRN and to characterize the impact of interference in different cells, and integer values of the per-hop fading severity parameters. The useful guidelines are introduced in the design of futuristic HSTRS for small-cell communications.
Highlights
I N past decades, satellite communication systems are widely deployed in various applications of broadcasting and navigation due to its broad coverage to terrestrial users [1]
We propose a small-cell hybrid satellite-terrestrial relay system (HSTRS) relying on non-orthogonal multiple access (NOMA) and main analysis is based on system performance of smallcell users
The reason is that the OMA-based HSTRS needs more time slots to transmit two consecutive signals x1, x2 while only one time slot is served for NOMA-based HSTRS counterpart
Summary
I N past decades, satellite communication systems are widely deployed in various applications of broadcasting and navigation due to its broad coverage to terrestrial users [1]. The secure performance at physical layer in a hybrid satellite and free-space optical (FSO) cooperative system is studied [12] They derived exact analytical formula together with the asymptotic analysis for the average secrecy capacity and secrecy outage probability (SOP) for both cases of AF and DF relaying. A small-cell network was studied in the context of Hetnet-based cellular networks for both downlink and uplink by introducing three techniques including full-duplex transmission mode, energy harvesting, and power domainbased NOMA schemes [28]. They derive analytical formula to evaluate the system’s performance in terms of the outage probability and throughput
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