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.
|Title of host publication||2015 IEEE MTT-S International Microwave Symposium, IMS 2015|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|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
|Name||2015 IEEE MTT-S International Microwave Symposium, IMS 2015|
|Other||IEEE MTT-S International Microwave Symposium, IMS 2015|
|Period||15/5/17 → 15/5/22|
Bibliographical notePublisher Copyright:
© 2015 IEEE.
All Science Journal Classification (ASJC) codes
- Computer Networks and Communications
- Signal Processing
- Electrical and Electronic Engineering