Secrecy analysis of uplink IM-OFDMA systems in the presence of IQ imbalance

Alaca O., Althunibat S., YARKAN S., Miller S. L., Qaraqe K. A.

IEEE Transactions on Vehicular Technology, cilt.72, sa.11, ss.14411-14425, 2023 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 72 Sayı: 11
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1109/tvt.2023.3285209
  • Dergi Adı: IEEE Transactions on Vehicular Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.14411-14425
  • Anahtar Kelimeler: IM-OFDMA, IQ imbalances, Physical layer security, Secrecy outage probability, Strictly positive secrecy capacity
  • İstanbul Ticaret Üniversitesi Adresli: Evet

Özet

This article introduces the secrecy analysis of the index modulation-based orthogonal frequency division multiple access (IM-OFDMA) schemes by considering the in-phase and quadrature imbalance (IQI) presence at the users' RF front ends. In particular, by assuming the existence of an eavesdropper, the secrecy performance of the considered uplink multiple-Access system is investigated through the strictly positive secrecy capacity and secrecy outage probability, and closed-form expressions are derived for both quantities. Moreover, the secrecy performance is conducted regarding IQI compensation based on a preamble-based estimation method. Further, analysis of the impact of the different parameters of IM-OFDMA, IQI, and estimation method is included via analytical and simulation-based results. The results reveal that IM-OFDMA is more reliable in secrecy performance than OFDMA, regardless of whether IQI is present. Also, IQI compensation can lead to a better secrecy performance compared to the case of no IQI.