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Ergodic Capacity Analysis of NOMA-Based Two-Way Relaying Systems

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posted on 19.04.2022, 04:08 authored by Wali Ullah KhanWali Ullah Khan, Basem M. Elhalawany, Daniel B. da Costa, Rukhsana Ruby, Omer Waqar, Kaishun Wu

In this work, a non-orthogonal multiple access NOMA) relying on a two-way relaying (TWR) approach is investigated to promote more efficient use of the available spectrum. Specifically, a NOMA-enabled half-duplex decode-and-forward relay node is used to simultaneously exchange data between two cellular users and a base station (BS), while assuming that the direct links between the two users and the BS are unavailable or negligible. In our analysis, the ergodic capacity is evaluated, in which high signal-to-noise ratio approximations, as well as upper bounds are derived owing to the intractability related to the exact analysis. The results reveal the superiority of the proposed TWRNOMA scheme compared with the traditional one-way relaying (OWR-NOMA) scheme. Additionally, simulation results show that selecting a relay station (RS) closer to the BS can achieve a higher ergodic sum capacity or the system than selecting a far RS.

History

Email Address of Submitting Author

waliullah.khan@uni.lu

ORCID of Submitting Author

https://orcid.org/ 0000-0003-1485-5141

Submitting Author's Institution

University of Luxembourg

Submitting Author's Country

Luxembourg