On Performance Analysis of Underlay Cognitive Radio-Aware Hybrid OMA/NOMA Networks with Imperfect CSI

This study considers the outage and throughput performance of downlink in the secondary network of cognitive radio assisted non-orthogonal multiple access (NOMA) systems. Both orthogonal multiple access (OMA) mode and NOMA mode are investigated with respect to status of decoding operation of each us...

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Bibliographic Details
Published in:Electronics (Basel) 2019-07, Vol.8 (7), p.819
Main Authors: Do, Dinh-Thuan, Le, Anh-Tu, Lee, Byung Moo
Format: Article
Language:English
Subjects:
Approximation
Cognitive radio
Energy efficiency
Licenses
Nonorthogonal multiple access
Random variables
Receivers & amplifiers
Signal to noise ratio
Wireless networks
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Summary:This study considers the outage and throughput performance of downlink in the secondary network of cognitive radio assisted non-orthogonal multiple access (NOMA) systems. Both orthogonal multiple access (OMA) mode and NOMA mode are investigated with respect to status of decoding operation of each user. Depending on the transmit signal-to-noise ratio (SNR) at the primary source and interference constraint from the primary network, the closed-form expressions of the outage probability for two users are obtained and compared in terms of performance. To obtain further insights, an asymptotic analysis of the outage probability in the high SNR regime is presented. Optimal throughput also provides insight in the computation of the power allocation factor. Furthermore, power allocation factor, target rates, and transmit SNR are evaluated to obtain reasonable outage performance. Monte Carlo simulations are conducted to confirm the analytical results.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics8070819