Performance Evaluation of NOMA-Based Cognitive Integrated Satellite Terrestrial Relay Networks With Primary Interference

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. INDEX TERMSIntegrated satellite-terrestrial relay network (ISTRN), Non-orthogonal multiple access (NOMA), Cognitive radio (CR), Primary interference (PI).

Spectrum Sharing in the Sky and Space: A Survey

“…Based on the analysis in [ 62 ], Refs. [ 63 , 64 ] also gave an asymptotic expression of outage probability, the system performance of which is easier to analyze under high signal-to-noise ratio (SNR).…”

“…Refs. [ 60 , 62 , 63 , 64 ] studied the introduction of NOMA into the hybrid satellite–ground network and conducted power allocation according to the channel conditions of each user to reduce outage probability while ensuring fairness. Power allocation can also be combined with spectrum resource allocation to reduce the interference of the whole network by reducing the total transmitter power [ 93 ].…”

Performance of Spectrum Sharing in Hybrid Satellite Terrestrial Network with Opportunistic Relay Selection

“…Integrating satellite networks and terrestrial networks to build a three-dimensional network with seamless global coverage has become an important direction for the development of sixth generation (6G) network technology and has become a research hotspot in the current academic and industrial circles [1]. Today, both satellite and terrestrial networks are rapidly expanding to meet growing demands for higher throughput, lower latency, and wider coverage.…”