Abstract
Satellite-terrestrial networks (STNs) have received significant attention from research and industry due to their capability of providing a stable connection to rural and distant areas, where the allocation of terrestrial infrastructures is uneconomical or difficult. Moreover, the STNs are considered as a promising enabler of fifth-generation communication networks. However, expected massive connectivity in future communication networks will face issues associated with spectrum scarcity. In this regard, the integration of cognitive radio and non-orthogonal multiple access (NOMA) techniques into STNs is considered as a promising remedy. Thereafter, in this article, we investigate NOMA-assisted cognitive STN under practical system conditions, such as transceiver hardware impairments, channel state information mismatch, imperfect successive interference cancellation, and interference noises. Generalized coverage probability formulas for NOMA users in both primary and secondary networks are derived considering the impact of interference temperature constraint and its correctness is verified through Monte Carlo simulation. Furthermore, to achieve performance fairness among the users, power allocation factors based on coverage fairness for primary and secondary NOMA users are provided. Moreover, the numerical results demonstrate superior performance compared to the ones obtained from an orthogonal multiple access scheme and examine the imperfection's impact on the system performance in terms of coverage and throughput.
Highlights
Satellite-terrestrial networks (STNs) have been gaining enormous attention in recent years from both academia and industry due to their capability of providing a stable data connection over a wide coverage area, including rural and isolated areas, where the allocation of terrestrial infrastructures are profligate or challenging
It is seen from the plot that a better CP for the non-orthogonal multiple access (NOMA)-based network is achieved at a higher value of the interference temperature constraint (ITC)
It should be noted that our analytical findings perfectly coincide with the Monte Carlo simulations which verify the correctness of our derivations
Summary
Satellite-terrestrial networks (STNs) have been gaining enormous attention in recent years from both academia and industry due to their capability of providing a stable data connection over a wide coverage area, including rural and isolated areas, where the allocation of terrestrial infrastructures are profligate or challenging. The authors in [37] obtained the closed-form and asymptotic outage probability expressions for both PN and SN users under the DF relay protocol, while a similar system model was evaluated in terms of the ergodic capacity considering the AF protocol in [38] As a result, both works revealed the superior performance of the NOMA scheme over conventional OMA networks. In [40], the authors derived analytical expression using Meijer-G functions for the ergodic capacity of the NOMA-assisted CSTNs and confirmed its advantages over traditional TDMA schemes They examined the network performance by varying different system parameters, namely, terrestrial and satellite link configurations and PA coefficients. The impact of all the imperfections is examined explicitly in terms of the CP and throughput
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