1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation

Donghyun Lee; Byung Wook Min

doi:10.1109/MWSYM.2015.7166897

1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation

Donghyun Lee, Byung Wook Min

Department of Electrical and Electronic Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

14 Citations (Scopus)

Abstract

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.

Original language	English
Title of host publication	2015 IEEE MTT-S International Microwave Symposium, IMS 2015
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781479982752
DOIs	https://doi.org/10.1109/MWSYM.2015.7166897
Publication status	Published - 2015 Jul 24
Event	IEEE MTT-S International Microwave Symposium, IMS 2015 - Phoenix, United States Duration: 2015 May 17 → 2015 May 22

Publication series

Name	2015 IEEE MTT-S International Microwave Symposium, IMS 2015

Other

Other	IEEE MTT-S International Microwave Symposium, IMS 2015
Country/Territory	United States
City	Phoenix
Period	15/5/17 → 15/5/22

Bibliographical note

Publisher Copyright:
© 2015 IEEE.

All Science Journal Classification (ASJC) codes

Computer Networks and Communications
Signal Processing
Electrical and Electronic Engineering

Access to Document

10.1109/MWSYM.2015.7166897

Cite this

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title = "1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation",

abstract = "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.",

author = "Donghyun Lee and Min, {Byung Wook}",

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Lee, D & Min, BW 2015, 1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation. in 2015 IEEE MTT-S International Microwave Symposium, IMS 2015., 7166897, 2015 IEEE MTT-S International Microwave Symposium, IMS 2015, Institute of Electrical and Electronics Engineers Inc., IEEE MTT-S International Microwave Symposium, IMS 2015, Phoenix, United States, 15/5/17. https://doi.org/10.1109/MWSYM.2015.7166897

1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation. / Lee, Donghyun; Min, Byung Wook.

2015 IEEE MTT-S International Microwave Symposium, IMS 2015. Institute of Electrical and Electronics Engineers Inc., 2015. 7166897 (2015 IEEE MTT-S International Microwave Symposium, IMS 2015).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - 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.

AB - 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.

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1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation

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