Circular Shifting-Based Secure Key Generation for FDD Wireless Systems
IEEE Wireless Communications Letters, cilt.15, ss.4867-4871, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 15
- Basım Tarihi: 2026
- Doi Numarası: 10.1109/lwc.2026.3726622
- Dergi Adı: IEEE Wireless Communications Letters
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Compendex, INSPEC, Technology Collection (ProQuest)
- Sayfa Sayıları: ss.4867-4871
- Anahtar Kelimeler: Circular shifting, eavesdropping, frequency division duplexing, physical layer security, secret key generation
- İstanbul Medipol Üniversitesi Adresli: Evet
Özet
Wireless channel-based secret key generation (SKG) exploits channel reciprocity in time division duplexing (TDD) systems for symmetric key extraction. In frequency division duplexing (FDD), the lack of reciprocity requires multiple exchanges, exposing channel information to eavesdroppers. To mitigate this, we propose a circular shifting-based physical-layer method for FDD-SKG, where pilot sequences are circularly shifted and transmitted. This adds randomness, improves security, and remains lightweight. In addition, the letter presents a unified theoretical analysis of wireless channel-based SKG performance in both TDD and FDD systems, deriving key mismatch probability and key generation rate. Simulation results validate the proposed method’s security, confirm key randomness through the National Institute of Standards and Technology Statistical Test Suite, and validate the theoretical analyses.