NOMA in Cooperative Underlay Cognitive Radio Networks Under Imperfect SIC

In conventional cognitive radio (CR), the users in secondary network (SN) can only access the idle spectrum when users in primary network (PN) are absent. This novel strategy provides higher spectrum efficiency when detecting the presence of the PN. Hence, spectrum utilization of the traditional sch...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.86180-86195
Main Authors: Do, Dinh-Thuan, Le, Anh-Tu, Lee, Byung Moo
Format: Article
Language:English
Subjects:
Cognitive radio
Energy harvesting
Fading channels
imperfect SIC
NOMA
Nonorthogonal multiple access
outage probability
Power system reliability
Probability
Rayleigh distribution
Relaying
Relays
Resource management
Silicon carbide
underlay cognitive radio
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Summary:In conventional cognitive radio (CR), the users in secondary network (SN) can only access the idle spectrum when users in primary network (PN) are absent. This novel strategy provides higher spectrum efficiency when detecting the presence of the PN. Hence, spectrum utilization of the traditional scheme can be further improved as exploiting application of non-orthogonal multiple access (NOMA). As combination of CR and NOMA, such CR-NOMA has been proposed to improve spectrum efficiency to adapt to requirements in 5G communications. In this study, the relaying scheme is employed in the SN of the proposed CR-NOMA and the relay is allowed to energy harvesting (EH) from the secondary transmitter to serve signal forwarding to distant secondary users. With this regard, the complex model of EH-assisted CR-NOMA is explored in outage behavior and throughput performance as awareness on imperfect successive interference cancellation (SIC) at the receiver. As most important results, the exact closed-form of the exact outage probability is derived for each NOMA destination by assuming that the channel coefficients among considered links follow Rayleigh distribution. Furthermore, performance gap between two NOMA users can be controlled by various parameters such as transmit power, energy harvesting coefficients and levels of imperfect SIC. Simulation results verify our analytical results.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2992660