1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation
1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation
复制标题
具有 60 dB 自干扰消除功能的 1-TX 和 2-RX 带内全双工无线电前端
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Byung
中科院分区：
文献类型：
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作者：
Donghyun Lee;Byung
本文给出了全双工无线电前端自干扰消除的实验结果。提出的射频前端使用三根天线用于1-TX和2（主分集）-RX MISO系统，没有射频循环器。发射信号通过180°相位差的大鼠竞赛耦合器馈送到两个相同的天线，在与发射天线间隔等的RX分集天线处产生信号抵消。利用大鼠赛跑耦合器的隔离端口，两个TX天线也可以用于RX主天线，保持其自身的发射功能。剩余的自干扰信号通过可调谐射频抵消电路进一步消除，该电路由可变衰减器、移相器和真延时组成。优化射频对消电路后，测量结果显示，RX分集和RX主路径分别在80 mhz和60 mhz带宽下实现了60 db的自干扰对消。
This paper presents experimental results of self-interference cancellation of a full-duplex radio front-end. The proposed RF front-end uses three antennas for a 1-TX and 2 (primary and diversity)-RX MISO system without RF circulators. Transmitting signals are fed to two identical antennas through a rat race coupler with 180° phase difference, resulting in the signal cancellation at the RX diversity antenna which is equally spaced from transmitting antennas. Using the isolation port of the rat race coupler, the two TX antennas can also be used for RX primary antenna maintaining its own function of transmitting. The remaining self-interference signals are further canceled by tunable RF cancellation circuits, which consist of variable attenuator, phase shifter, and true time delay. After optimizing RF cancellation circuits, the measured results show 60-dB self-interference cancellation over 80-MHz and 60-MHz bandwidth in RX diversity and RX primary paths, respectively.