On the leakage-rate performance of untrusted relay-aided NOMA under co-channel interference

ÖZDURAN V., Nomikos N.

Telecommunication Systems, cilt.85, sa.1, ss.67-86, 2024 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 85 Sayı: 1
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1007/s11235-023-01071-9
  • Dergi Adı: Telecommunication Systems
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, ABI/INFORM, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, INSPEC
  • Sayfa Sayıları: ss.67-86
  • Anahtar Kelimeler: Leakage rate, Non-orthogonal multiple access, Untrusted relay
  • İstanbul Üniversitesi-Cerrahpaşa Adresli: Evet

Özet

This study seeks an answer for the impact of the co-channel interference on the leakage rate of illegitimate relay-assisted power-domain non-orthogonal multiple access (NOMA) networks. The power-domain NOMA-based uni-/bi-directional information exchange through an illegitimate half-/full-duplex relay is adopted in the system model. Moreover, a limited number of co-channel interferers and friendly jammers are affected by the illegitimate relay in the network. Extensive computer simulations, analytical, and asymptotic results reveal that as the illegitimate relay is affected by a limited number of friendly jammers and co-channel interferers, its achievable rate cannot be enhanced and saturates at high signal-to-noise ratio. Results also show that the co-channel interference causes system coding gain losses on the users’ outage performance. In addition, the illegitimate relay remains active between -10 and 25 dB for uni-/bi-directional information exchange. After 25 dB, the illegitimate relay saturates and experiences outages. Additionally, the order of decoding also impacts the illegitimate relay’s performance.