NDLI: Ensuring equal outage performance for down-link secondary users in full/half duplex cognitive NOMA systems

Content Provider	IET Digital Library
Author	Aswathi, V Babu, A V
Abstract	This study considers an underlay cognitive radio (CR) system, where the secondary network employs cooperative non-orthogonal multiple access (NOMA) to transfer information for downlink secondary users (SUs). Here the near user is enabled to act as a full duplex/half duplex (FD/HD) decode-and-forward (DF) relay for the far user. We derive analytical expressions for the outage probabilities experienced by the SUs in the considered FD/HD – CR-NOMA network. The maximum transmit power constraint of the secondary nodes and the tolerable interference power constraints at the primary receiver are considered for the analysis. We provide numerical and simulation results to identify the impact of key system parameters on the outage performance of SUs. Further, we provide insights on the selection of key system parameters such as NOMA power allocation coefficient for ensuring that both the SUs experience equal outage performance. Finally, we derive an analytical expression for the system outage probability of the FD-CR-NOMA network. We determine the optimal power allocation (OPA) factor at the secondary transmitter that minimises the system outage probability. We establish that OPA can reduce the system outage significantly as compared to the default choice of power allocation factor. The analytical results are validated by extensive simulation studies.
Starting Page	63
Ending Page	75
Page Count	13
ISSN	17518628
Volume Number	14
e-ISSN	17518636
Issue Number	Issue 1, Jan (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/14/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2019.0055
Journal	IET Communications
Publisher Date	2019-09-27
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Analytical Expression Cognitive Radio Cooperative Communication Decode And Forward Communication Down-link Secondary User Downlink Secondary User Electromagnetic Compatibility Ensuring Equal Outage Performance FD-CR-NOMA Network Interference Key System Parameter Maximum Transmit Power Constraint NOMA Power Allocation Coefficient Nonorthogonal Multiple Access Optimal Power Allocation Outage Probabilities Power Allocation Factor Probability Radio Frequency Interference Radio Link And Equipment Radio Network Reliability Secondary Network Secondary Node Secondary Transmitter Statistics SUs Experience Equal Outage Performance System Outage Probability Telecommunication Network Reliability Tolerable Interference Power Constraint Underlay Cognitive Radio
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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