Abstract
Satellite communication has attracted great interests due to extensive coverage and no terrain restriction, which can make up for the shortcomings of terrestrial communication, especially in remote areas. Hence, integrated satellite-terrestrial relay network (ISTRN) is considered as a promising research direction. However, the shortage of spectrum resources is becoming the bottleneck of the future development of ISTRN because of the low utilization of spectrum. In this regard, non-orthogonal multiple access (NOMA) scheme and cognitive radio are considered as great ways to solve this problem. This paper investigates the performance of a NOMA-based ISTRN under spectrum sharing environment with primary interference. Particularly, the exact closed-form expressions of outage probability and ergodic capacity are derived to evaluate the system performance, where the interference constraint caused by the multiple primary users and the interference of primary transmitter have been considered. Furthermore, in order to reveal the impacts of key parameters on system performance at high signal-to-noise ratios efficiently, the asymptotic analysis of OP is also provided. After that, we obtain the relationship between system performance and the power allocation factor, the number of primary users, interference parameter or the channel environment, which will enlighten the research of NOMA-based cognitive ISTRN. At last, Monte Carlo results are provided to verify the effectiveness of our theoretical analysis.
Highlights
Due to the extensive coverage, great ability to resist natural disasters, and being not affected by the terrain, Satellite communication (SatCom) has been paid significant attention over recent years [1]–[3]
It can be clearly observed that the asymptotic analysis is in good agreement with the theoretical analysis at high SNRs, this proves that our asymptotic OP is effective
In this paper, the performance of the non-orthogonal multiple access (NOMA)-based CISTRN under spectrum sharing environment with primary interference (PI) and multiple PUs was investigated, which has not been investigated in existing works
Summary
Due to the extensive coverage, great ability to resist natural disasters, and being not affected by the terrain, Satellite communication (SatCom) has been paid significant attention over recent years [1]–[3]. In [27], the authors proposed a secure BF scheme for rate-splitting multiple access based cognitive satellite-terrestrial network, where existed multiple eavesdroppers, to maximum the secure energy efficiency. Another method to improve the spectrum efficiency is NOMA scheme. The authors of [28] investigated the system performance of NOMA-based ISTRN with AF protocol, the exact OP expression and asymptotic OP expression were derived. The performance of NOMA-based overlay CISTRN with AF protocol was investigated in [33], where the secondary terrestrial network cooperated with primary satellite network for dynamic spectrum access.
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