Interference-Free ZT DFT-s-OFDM-Based Symbiotic Backscatter Communication
IEEE Open Journal of the Communications Society, cilt.7, ss.1958-1972, 2026 (ESCI, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 7
- Basım Tarihi: 2026
- Doi Numarası: 10.1109/ojcoms.2026.3667403
- Dergi Adı: IEEE Open Journal of the Communications Society
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Compendex, INSPEC, Directory of Open Access Journals
- Sayfa Sayıları: ss.1958-1972
- Anahtar Kelimeler: Acoustic-wave modulation, ambient IoT, backscatter communication, delay shift keying, direct-link interference, symbiotic radio, zero-tail DFT-s-OFDM
- İstanbul Medipol Üniversitesi Adresli: Evet
Özet
This article presents a unique lightweight and interference-free backscatter communication (BC) scheme based on zero tail discrete Fourier transform spread OFDM (ZT DFT-s-OFDM) waveform signals. In the proposed approach, the ZT region of the waveform is exploited to accommodate backscatter transmissions using delay shift keying (DSK) modulation. A backscatter device (BD) equipped with modulator based on acoustic-wave delay circuits conveys information by introducing deterministic delay shifts within the uncorrupted ZT portion of the ZT DFT-s-OFDM symbol, thus ensuring complete time-domain separation between the primary and BD signals. This approach effectively eliminates direct-link interference (DLI) while maintaining full compatibility with conventional receivers. To address the channel-estimation challenge, a low-complexity, non-coherent detector is developed, and its analytical performance is derived and validated through simulation. The simulations show consistency between the analytical and simulation results, demonstrating that the proposed design achieves a probability of missed detection (PMD) as low as 10-3 at 30 dB, therefore, confirming its robustness and suitability for low-power BC applications.