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Open AccessLetter

Performance Optimization of Hybrid Satellite-Terrestrial Relay Network Based on CR-NOMA

by 1,2, 2,* and 2
1
College of Communications Engineering, Army Engineering University, Nanjing 210007, China
2
Sixty-Third Research Institute, National University of Defense Technology, Nanjing 210007, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(18), 5177; https://doi.org/10.3390/s20185177
Received: 10 August 2020 / Revised: 3 September 2020 / Accepted: 9 September 2020 / Published: 10 September 2020
The non-orthogonal multiple access (NOMA) scheme realizes the transmission of multiple user signals at the same time and frequency resource block through power domain multiplexing, which improves the system transmission rate and user fairness. In this paper, we propose a joint relay-and-antenna selection scheme based on the cognitive radio scenario. This scheme can achieve the maximum communication rate of the secondary user when the primary user maintains the optimal outage performance. In the considered system both terrestrial relays and users are deployed with multi-antenna configurations and the terrestrial relays adopt the decode-and-forward (DF) strategy to achieve communication between satellites and users. Then, we derive the exact outage probability expression of each user in the system and the asymptotic probability expression under high signal-to-noise ratio (SNR). Numeric results demonstrate that increasing the number of relays and antennas on the terrestrial nodes can both improve system outage performance. Moreover, the number of relays imposes a more obvious effect on the achievable system performance. View Full-Text
Keywords: satellite communication; non-orthogonal multiple access; decode-and-forward; relay selection; antenna selection; outage probability satellite communication; non-orthogonal multiple access; decode-and-forward; relay selection; antenna selection; outage probability
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Zhao, L.; Liang, T.; An, K. Performance Optimization of Hybrid Satellite-Terrestrial Relay Network Based on CR-NOMA. Sensors 2020, 20, 5177.

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