Cover
Vol. 19 No. 1 (2023)

Published: June 30, 2023

Pages: 57-61

Original Article

Enhancement Spectral and Energy Efficiencies for Cooperative NOMA Networks

Haider S. Msayer 1 Husham L. Swadi Haider M. AlSabbagh
1Department of Electrical Engineering, College of Engineering, University of Basrah, Basrah, Iraq.
History
  • Received: August 29, 2022
  • Revised: September 12, 2022
  • Accepted: September 12, 2022
  • Available Online: January 7, 2023
DOI

https://doi.org/10.37917/ijeee.19.1.7

Abstract

The tremendous development in the field of communications is derived from the increasing demand for fast transmission and processing of huge amounts of data. The non-orthogonal multiple access (NOMA) system was proposed to increase spectral efficiency (SE) and improve energy efficiency (EE) as well as contribute to preserving the environment and reducing pollution. In the NOMA system, a user may be considered as a relay to the others that support the coverage area based on adopting the reuse of the frequency technique. This cooperation enhances the spectral efficiency, however, in the cell, there are other users that may affect the spectral allocation that should be taken into consideration. Therefore, this paper is conducted to analyze the case when three users are available to play as relies upon. The analyses are performed in terms of the transmitted power allocation in a fair manner, and the system's performance is analyzed using the achievable data rates and the probability of an outage. The results showed an improvement in throughputs for the second and third users, as its value ranged from 7.57 bps/Hz to 12.55 bps/Hz for the second user and a quasi-fixed value of 1,292 bps/Hz for the third user at the transmitted power ranging from zero to 30 dBm.

Keywords

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