A Full-Duplex Radio Using a CMOS Non-Magnetic Circulator Achieving +95 dB Overall SIC

A Full-Duplex Radio Using a CMOS Non-Magnetic Circulator Achieving +95 dB Overall SIC
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使用 CMOS 非磁性环行器实现 95 dB 总体 SIC 的全双工无线电

DOI:
10.1109/usnc-ursi.2019.8861766
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发表时间:
2019
期刊:
July 2019.
影响因子:
--
通讯作者:
Krishnaswamy, Harish
Krishnaswamy, Harish
中科院分区:
--
文献类型:
--
作者:
Nagulu, Aravind;Chen, Tingjun;Zussman, Gil;Krishnaswamy, Harish

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全双工(FD)无线是一种新兴的无线通信范例,其中发射器和接收器同时以相同频率操作。实现FD无线的一个主要挑战是使接收器饱和的TX信号的干扰,通常称为自干扰(SI)。传统上,自干扰消除(SIC)在天线、RF/模拟和数字域中实现。在天线领域,SIC可以使用一对单独的TX和RX天线来实现,或者通过磁循环器使用由TX和RX共享的单个天线来实现,磁循环器通常体积庞大、昂贵并且不可与CMOS集成。然而,最近的进展表明,在CMOS中实现基于时空调制的高性能非互易环行器的可行性。在这项工作中,我们演示了一个高功率处理FD无线电使用USRP SDR采用SIC(一)在天线接口使用瓦级功率处理CMOS集成,无磁环行器,(二)在RF域中使用一个紧凑的RF消除器,(三)在数字域。我们的原型FD无线电在+15dBm TX功率水平下实现了+95 dB的整体SIC。我们分析了环行器TX-RX非线性对总可实现SIC的影响。
Full-duplex (FD) wireless is an emerging wireless communication paradigm where the transmitter and the receiver operate simultaneously at the same frequency. One major challenge in realizing FD wireless is the interference of the TX signal saturating the receiver, commonly referred to self-interference (SI). Traditionally, self-interference cancellation (SIC) is achieved in the antenna, RF/analog, and digital domains. In the antenna domain, SIC can be achieved using a pair of separate TX and RX antennas, or using a single antenna shared by the TX and RX through a magnetic circulator, which is usually bulky, expensive, and not integrable with CMOS. Recent advances, however, have shown the feasibility of realizing high-performance non-reciprocal circulators in CMOS based on spatio-temporal modulation. In this work, we demonstrate a high power handling FD radio using a USRP SDR which employs SIC (i) at the antenna interface using a watt-level power-handling CMOS integrated, magnetic-free circulator, (ii) in the RF domain using a compact RF canceler, and (iii) in the digital domain. Our prototyped FD radio achieves +95 dB overall SIC at +15dBm TX power level. We analyze the effects of the circulator TX-RX non-linearity on the total achievable SIC.
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发表时间: 2016
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