Abstract
Satellite communication is becoming more and more significant in present and future communication systems for its unique advantages of strong survivability and seamless coverage, which can offset the defects of terrestrial communication such as being restricted by terrain and little coverage. Moreover, unmanned aerial vehicle (UAV)-assisted communication is considered as a promising development direction due to its flexibility and expansibility in the integrated satellite-terrestrial networks (ISTN). In addition, to overcome the spectrum shortage and low spectrum utilization problems, cognitive radio and nonorthogonal multiple access (NOMA) has been widely utilized to enhance spectrum efficiency, which is considered as the key technologies of the next generation communication. In this regard, our paper investigates the performance of cognitive satellite-UAV-terrestrial networks with NOMA scheme and multiple primary users. Specifically, the exact expressions of outage probability (OP) and ergodic capacity for both primary network and secondary network are derived. To gain further views, the asymptotic expression of OP and diversity orders for the two networks are provided. Finally, through numerical simulations, the correctness of the theoretical derivations is verified and the influences of critical variables on system indexes are also analyzed.
Highlights
For the generation wireless communication system, large coverage, high speed, low energy consumption, and high spectrum utilization are considered to be its main characteristics
Inspired by the abovementioned works, this paper considers a cognitive integrated satelliteUAV-terrestrial network (CISUAVTN) with nonorthogonal multiple access (NOMA) scheme and multiple primary users, while all users are equipped with multiple antennas
From the simulation results, we can clearly find that the Monte Carlo (MC) simulations results are in accordance with our theoretical results; the effectiveness of the analysis in Section 3 is demonstrated
Summary
For the generation wireless communication system, large coverage, high speed, low energy consumption, and high spectrum utilization are considered to be its main characteristics. E authors of [32] investigated the performance of an overlay cognitive ISTN with considering HIs, where an adaptive relay scheme was proposed to reduce OP. E authors of [36] proposed a BF scheme based on an iterative algorithm to maximize the sum rate of NOMA-based ISTN, which considered the transmission quality of both satellite and terrestrial nodes. E authors of [40] considered a NOMA-based cognitive ISTN with multiple SNs; the system performance was enhanced by adopting the partial SN selection scheme. Inspired by the abovementioned works, this paper considers a cognitive integrated satelliteUAV-terrestrial network (CISUAVTN) with NOMA scheme and multiple primary users, while all users are equipped with multiple antennas.
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