Wideband Self-Adaptive RF Cancellation Circuit for Full-Duplex Radio: Operating Principle and Measurements

This paper presents a novel RF circuit architecture for self-interference cancellation in inband full-duplex radio transceivers . The developed canceller is able to provide wideband cancellation with waveform bandwidths in the order of 100 MHz or beyond and contains also self-adaptive or self-healin...

Full description

Saved in:
Bibliographic Details
Published in2015 IEEE 81st Vehicular Technology Conference (VTC Spring) pp. 1 - 7
Main Authors Huusari, Timo, Yang-Seok Choi, Liikkanen, Petteri, Korpi, Dani, Talwar, Shilpa, Valkama, Mikko
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2015
Subjects
Antenna measurements
Antennas
Bandwidth
Delays
Radio frequency
Receivers
Transmission line measurements
Online AccessGet full text
ISSN1550-2252
DOI10.1109/VTCSpring.2015.7146163

Cover

More Information
Summary:This paper presents a novel RF circuit architecture for self-interference cancellation in inband full-duplex radio transceivers . The developed canceller is able to provide wideband cancellation with waveform bandwidths in the order of 100 MHz or beyond and contains also self-adaptive or self-healing features enabling automatic tracking of time-varying self-interference channel characteristics. In addition to architecture and operating principle descriptions, we also provide actual RF measurements at 2.4 GHz ISM band demonstrating the achievable cancellation levels with different bandwidths and when operating in different antenna configurations and under low-cost highly nonlinear power amplifier. In a very challenging example with a 100 MHz waveform bandwidth, around 41 dB total cancellation is obtained while the corresponding cancellation figure is close to 60 dB with the more conventional 20 MHz carrier bandwidth. Also, efficient tracking in time-varying reflection scenarios is demonstrated.
ISSN:1550-2252
DOI:10.1109/VTCSpring.2015.7146163