Abstract
The development of hybrid satellite-terrestrial relay networks (HSTRNs) is one of the driving forces for revolutionizing satellite communications in the modern era. Although there are many unique features of conventional satellite networks, their evolution pace is much slower than the terrestrial wireless networks. As a result, it is becoming more important to use HSTRNs for the seamless integration of terrestrial cellular and satellite communications. With this intent, this paper provides a comprehensive performance evaluation of HSTRNs employing non-orthogonal multiple access technique. The terrestrial relay is considered to be wireless-powered and harvests energy from the radio signal of the satellite. For the sake of comparison, both amplify-and-forward (AF) and decode-and-forward (DF) relaying protocols are considered. Subsequently, the closed-form expressions of outage probabilities and ergodic capacities are derived for each relaying protocol. Extensive simulations are performed to verify the accuracy of the obtained closed-form expressions. The results provided in this work characterize the outage and capacity performance of such a HSTRN.
Highlights
Satellite communication is considered to be one of the most reliable forms of wireless communications
The overall communication operates in two orthogonal time slots and it is considered that no direct link exists between the satellite and the non-orthogonal multiple access (NOMA)
D1 is affected by the interference which results in a ceiling at higher values of signal-to-noise ratio (SNR)
Summary
Satellite communication is considered to be one of the most reliable forms of wireless communications. Satellite communication networks have several advantages over conventional wireless communications that include long-distance communication, large coverage area, and flexible communication environments [1]. Due to this, their role in emergency applications is growing each passing year. When the terrestrial user is not outdoor or the angles of satellite elevation are low, the conventional mobile satellite networks suffer crucial performance degradation In this context, different relaying techniques can be employed to improve the coverage and reliability of the network. The HSTRNs can integrate the advantages of both conventional satellite networks and the terrestrial broadband networks Speaking, they have the ability to provide longer transmission coverage along with higher data rates without environmental limitations. We outline some of the recent state-of-the-art developments in this domain
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