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

IF 10.1 1区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY Engineering Pub Date : 2024-09-01 DOI:10.1016/j.eng.2024.02.007
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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.

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将偏振分复用技术与铁磁非互斥性相结合,为全双工无线系统实现带内超高隔离度
带内全双工(IBFD)无线系统通过支持带内信号的同时传输和接收,可将数据吞吐量提高一倍,并大大降低传输延迟,因此是 6G 及更高频率的理想选择。要实现 IBFD 系统,就必须大幅降低发射机(Tx)对接收机(Rx)信道的强自干扰(SI)信号。然而,目前应对这一挑战的最先进方法在性能、成本和复杂性方面效率低下,阻碍了 IBFD 技术的商业化。在这项工作中,我们设计并演示了一种创新方法,以实现 IBFD 系统,该系统在全无源模块中采用低成本、低复杂度的架构,表现出卓越的性能。我们的方案基于将偏振分复用(PDM)与铁磁非互易性的精心结合,以实现 Tx 和 Rx 信道之间的超高隔离度。这种前所未有的构想之所以可行,要归功于我们模块的关键特征--同时采用的双模环行器(首次引入的新元件)和双模波导(可将两个正交极化波转化为两个正交波导模式)。此外,我们还提出了一种独特的无源可调二级 SI 消除(SIC)机制,该机制嵌入到所提出的模块中,可在相对较宽的带宽上提高隔离度。我们报告,仅在模拟域,在相关中心频率的 340、101 和 33 MHz 带宽上,实验隔离度分别达到 50、70 和 80 dB,并具有出色的调谐能力。此外,该模块还在两个真实的 IBFD 场景中进行了测试,以评估其在存在 Tx 强干扰信号的情况下与 Tx 到 Rx 泄漏和调制误差有关的性能。
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来源期刊
Engineering
Engineering Environmental Science-Environmental Engineering
自引率
1.60%
发文量
335
审稿时长
35 days
期刊介绍: Engineering, an international open-access journal initiated by the Chinese Academy of Engineering (CAE) in 2015, serves as a distinguished platform for disseminating cutting-edge advancements in engineering R&D, sharing major research outputs, and highlighting key achievements worldwide. The journal's objectives encompass reporting progress in engineering science, fostering discussions on hot topics, addressing areas of interest, challenges, and prospects in engineering development, while considering human and environmental well-being and ethics in engineering. It aims to inspire breakthroughs and innovations with profound economic and social significance, propelling them to advanced international standards and transforming them into a new productive force. Ultimately, this endeavor seeks to bring about positive changes globally, benefit humanity, and shape a new future.
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