Ergodic Capacity for NOMA-Enabled ISATNs with Transmit Antenna Selection and Imperfect CSI and SIC

Abstract

Integrated satellite-aerial-terrestrial networks (ISATNs) expand the breadth and depth of seamless connections, which has been recognized as one of the key facilities of next-generation networks. This paper investigates the impact of transmit antenna selection, imperfect channel state information (CSI), and successive interference cancellation (SIC) on ergodic capacity (EC) of nonorthogonal multiple access- (NOMA-) enabled ISATNs, where a high altitude platform (HAP) assists the satellite transmission through decode-and-forward relaying protocol. Besides, two selection schemes are proposed to balance system complexity and transmission efficiency. Imperfect CSI and SIC are considered to impose detrimental effects on system performance. In addition, analytical expressions for EC of NOMA-enabled ISATNs in the presence of the above imperfections are derived. Finally, the Monte Carlo simulations corroborate analytical results and reveal the impacts of imperfections on integrated satellite-aerial-terrestrial networks.