首页|Combining Polarization-Division Multiplexing and Ferromagnetic Nonreciprocity to Achieve In-Band Ultra-High Isolation for Full-Duplex Wireless Systems

Combining Polarization-Division Multiplexing and Ferromagnetic Nonreciprocity to Achieve In-Band Ultra-High Isolation for Full-Duplex Wireless Systems

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The in-band full-duplex(IBFD)wireless system is a promising candidate for 6G and beyond,as it can dou-ble 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 trans-mitter(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 inno-vative 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 isola-tion 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 rela-tively 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 per-formance in connection with Tx-to-Rx leakage and modulation error in the presence of a Tx's strong interference signal.

In-band full-duplex transceiver6GPolarization-division multiplexingDual-mode nonreciprocity

Amir Afshani、Ke Wu

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Poly-Grames Research Center,Department of Electrical Engineering,École Polytechnique de Montréal,Montreal,QC H3T 1J4,Canada

Natural Sciences and Engineering Research Council(NSERC)-sponsored Industrial Research Chair program,an NSERC Discovery GrantFonds de recherche du Quebec Nature et technologies(FRQNT)Doctoral Fellowship of Amir Afshani funded by the Government of Qu

2024

10.1016/j.eng.2024.02.007

工程(英文)

工程(英文)

CSTPCDEI
ISSN：2095-8099
年,卷(期)：2024.40(9)