loading page

Ergodic Capacity Analysis of NOMA-Based Two-Way Relaying Systems
  • +3
  • Wali Ullah Khan ,
  • Basem M. Elhalawany ,
  • Daniel B. da Costa ,
  • Rukhsana Ruby ,
  • Omer Waqar ,
  • Kaishun Wu
Wali Ullah Khan
Author Profile
Basem M. Elhalawany
Author Profile
Daniel B. da Costa
Author Profile
Rukhsana Ruby
Author Profile
Omer Waqar
Author Profile
Kaishun Wu
Author Profile


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.