Performance Analysis of Satellite-Aerial-Terrestrial Multiple Primary Users Cognitive Networks Based on NOMA
Due to its unique advantages of strong survivability and seamless coverage,Satellite Communication(SatCom)can make up for the shortcomings of ground communication such as terrain limitations and small coverage,and has become increasingly important in current and future communication systems.In addition,aerial-assisted communication is considered as a valuable research direction due to its flexibility and scalability in satellite ground networks.To overcome the problems of spectrum shortage and low spectrum utilization in Integrated Satellite-Aerial-Terrestrial Network(ISATN),Cognitive Radio(CR)and Non-Orthogonal Multiple Access(NOMA)are used in wireless communication networks to improve spectrum utilization and transmission performance.In this regard,the performance of an NOMA-based Cognitive Integrated Satellite-Aerial-Terrestrial Network(CISATN)with multiple primary users is studied,and accurate expressions for Outage Probability(OP)and ergodic capacity of the primary and secondary networks are derived.Asymptotic expressions for the OP and diversity order of these two networks are provided to obtain further insights.Finally,the correctness of the theoretical derivation is verified through numerical simulation,and the impact of key variables on system indicators is analyzed.
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