4.6 Article

Energy Harvesting in Overlay Cognitive NOMA Systems With Hardware Impairments

Journal

IEEE SYSTEMS JOURNAL
Volume 16, Issue 2, Pages 2648-2659

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSYST.2021.3082552

Keywords

NOMA; Relays; IP networks; Hardware; Radio frequency; Wireless networks; Fading channels; Cognitive radio (CR); energy harvesting (EH); hardware impairments (HIs); nonorthogonal multiple access (NOMA); overlay spectrum sharing system

Ask authors/readers for more resources

In this study, a system incorporating energy harvesting, cognitive radio, and nonorthogonal multiple access techniques is proposed, where a secondary transmitter node harvests energy from a primary transmitter's radio-frequency signal for relaying purposes. Two spectrum sharing cooperation schemes are implemented to address hardware impairments and distortion noises impact, evaluating system throughput and energy efficiency. The results demonstrate the advantages of the proposed schemes over traditional transmission and access methods.
Combining energy harvesting with cognitive radio and nonorthogonal multiple access (NOMA) techniques will be a notable candidate for improving both energy and spectral efficiency of wireless systems. In this article, we appraise the performance of an overlay cognitive NOMA (OCNOMA) system by employing an energy-harvesting-based spectrum sharing cooperation (SSC) scheme in the presence of hardware impairments (HIs) at the transceiver nodes. Herein, an energy-constrained secondary transmitter node harvests energy from primary transmitter's radio-frequency signal and utilizes this energy to relay primary information signal as well as to transmit its own information signal using NOMA technique. For this, we investigate two SSC schemes using amplify-and-forward (AF) and decode-and-forward (DF) relaying strategies, named as SSC-AF and SSC-DF schemes. Importantly, we consider the impact of the imperfect successive interference cancellation in NOMA and distortion noises in signal processing due to HIs, which are inevitable in practical systems. Adopting Nakagami-m fading environments, we derive the expressions of outage probability for primary and secondary networks under both SSC-AF and SSC-DF schemes and, thereby, disclose some pertinent ceiling effects in the system. Furthermore, we evaluate the system throughput and energy efficiency for the considered OCNOMA system. Our results manifest the advantages of the proposed SSC schemes over the benchmark direct primary transmission and orthogonal multiple access schemes.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available