Article de revue (2024)
Document en libre accès chez l'éditeur officiel |
Abstract
The in-band full-duplex (IBFD) wireless system is a promising candidate for 6G and beyond, as it can double data throughput and enormously lower transmission latency by supporting simultaneous in-band transmission and reception of signals. Enabling IBFD systems requires a substantial mitigation of a transmitter (Tx)’s strong self-interference (SI) signal into the receiver (Rx) channel. However, current state-of-the-art approaches to tackle this challenge are inefficient in terms of performance, cost, and complexity, hindering the commercialization of IBFD techniques. In this work, we devise and demonstrate an innovative approach to realize IBFD systems that exhibit superior performance with a low-cost and less-complex architecture in an all-passive module. Our scheme is based on meticulously combining polarization-division multiplexing (PDM) with ferromagnetic nonreciprocity to achieve ultra-high isolation between Tx and Rx channels. Such an unprecedented conception has become feasible thanks to a concurrent dual-mode circulator—a new component introduced for the first time—as a key feature of our module, and a dual-mode waveguide that transforms two orthogonally polarized waves into two orthogonal waveguide modes. In addition, we propose a unique passive tunable secondary SI cancellation (SIC) mechanism, which is embedded within the proposed module and boosts the isolation over a relatively broad bandwidth. We report, solely in the analog domain, experimental isolation levels of 50, 70, and 80 dB over 340, 101, and 33 MHz bandwidth at the center frequency of interest, respectively, with excellent tuning capability. Furthermore, the module is tested in two real IBFD scenarios to assess its performance in connection with Tx-to-Rx leakage and modulation error in the presence of a Tx’s strong interference signal.
Mots clés
in-band full-duplex transceiver; 6G; polarization-drivent multiplexing; dual-mode nonreciprocity
Sujet(s): |
2500 Génie électrique et électronique > 2500 Génie électrique et électronique 2500 Génie électrique et électronique > 2513 Transmission des données 2500 Génie électrique et électronique > 2520 Dispositifs, circuits et technologie hyperfréquences et d'ondes millimétriques |
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Département: | Département de génie électrique |
Centre de recherche: | POLY-GRAMES - Centre de recherche avancée en micro-ondes et en électronique spatiale |
Organismes subventionnaires: | NSERC / CRSNG sponsored Industrial Rsearch Chair, NSERC / CRSNG Discovery Grant, FRQNT (Fonds de recherche du Québec Nature et technologies), Government of Québec Province |
URL de PolyPublie: | https://publications.polymtl.ca/57905/ |
Titre de la revue: | Engineering |
Maison d'édition: | Elsevier |
DOI: | 10.1016/j.eng.2024.02.007 |
URL officielle: | https://doi.org/10.1016/j.eng.2024.02.007 |
Date du dépôt: | 26 juin 2024 14:42 |
Dernière modification: | 25 sept. 2024 16:50 |
Citer en APA 7: | Afshani, A., & Wu, K. (2024). Combining polarization-division multiplexing and ferromagnetic nonreciprocity to achieve in-band ultra-high isolation for full-duplex wireless systems. Engineering, 16 pages. https://doi.org/10.1016/j.eng.2024.02.007 |
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