Full-duplex radio with two receivers for self-interference cancellation
Full-duplex radio with two receivers for self-interference cancellation
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带两个接收器的全双工无线电，用于消除自干扰
DOI：
10.1049/iet-map.2019.0539
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Deo P
中科院分区：
文献类型：
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作者：
Deo P
提出了一种能够在射频（RF）和基带级进行真实的实时模拟自干扰消除的全双工无线电系统的设计和实现。该系统由一个双贴片三端口正交线性极化天线系统（无环行器/双工器）、一个零差双路接收机和一个基带差分放大器组成。来自两个接收器的干扰输出使用固定衰减器来均衡，并且当它们通过基带处的差分放大器时，它们被有效地消除。对于所报告的系统，天线系统在以3.2GHz的工作频率为中心的60 MHz带宽上在发射端口和接收端口之间提供45.1dB的隔离。在−5.6 dBm发射功率下，差分放大器在基带实现的干扰消除可将总自干扰降至最低81.5 dB。使用所提出的系统，恢复两种不同类型的基带信号在真实的时间被证明，而周围是多径使能。由于基带处的自干扰是通过差分放大器而不是复杂的数字信号处理单元来消除的，因此所提出的系统适用于无法使用模数转换器的宽带毫米波全双工收发器。
The design and implementation of a full‐duplex radio system capable of real‐time analogue self‐interference cancellation at radio frequency (RF) and baseband stages are presented. The system consists of a dual‐patch three‐port orthogonally linear polarised antenna system (without a circulator/duplexer), a homodyne dual receiver, and a differential amplifier at the baseband. The interference outputs from the two receivers are equalised using a fixed attenuator and when they are passed through the differential amplifier at the baseband they are effectively cancelled. For the system reported the antenna system provides 45.1 dB isolation between transmit and receive ports over 60 MHz bandwidth centred at the operating frequency of 3.2 GHz. Interference cancellation achieved by the differential amplifier at the baseband reduces the total self‐interference to 81.5 dB minimum at −5.6 dBm transmit power. Using the proposed system, the recovery of two different types of baseband signals in real time is demonstrated while the surrounding is multipath enabled. Since the self‐interference at baseband is removed by the differential amplifier instead of a complex digital signal processing unit, it makes the proposed system suitable for broad‐band millimetre‐wave full‐duplex transceivers where the use of analogue/digital converter is not an option.