A 28-GHz Full Duplex Front-End and Canceller Using Two Cross-Polarized 64-Element Phased Arrays

This paper presents studies on the self-interference level of a 28-GHz full-duplex phased-array system. The full-duplex system consists of two 64-element phased-arrays and a 28-GHz canceller. The phased-arrays are designed with 2×2 beamformer chips, and the arrays are used as a transmitter and a receiver with a cross-polarization set-up. The 28-GHz canceller is also based on the same 2×2 beamformer chip with multiple-delay taps. The full duplex front-end with a canceller results in 57-dB isolation between the transmitting and receiving arrays at 28.5-29.5 GHz without saturating any LNAs. The system requires only 16-dB additional digital cancellation to bring the self-interference down to the receiver noise floor of 1-GHz bandwidth while the transmit EIRP is maintained at 41 dBm.

[1]  Sachin Katti,et al.  Full duplex radios , 2013, SIGCOMM.

[2]  Gabriel M. Rebeiz,et al.  A Low-Cost Scalable 32-Element 28-GHz Phased Array Transceiver for 5G Communication Links Based on a $2\times 2$ Beamformer Flip-Chip Unit Cell , 2018, IEEE Journal of Solid-State Circuits.

[3]  Sachin Katti,et al.  Full Duplex MIMO Radios , 2014, NSDI.

[4]  Mikko Valkama,et al.  Reference receiver based digital self-interference cancellation in MIMO full-duplex transceivers , 2014, 2014 IEEE Globecom Workshops (GC Wkshps).

[5]  Byung-Wook Min,et al.  1-TX and 2-RX in-band full-duplex radio front-end with 60 dB self-interference cancellation , 2015, 2015 IEEE MTT-S International Microwave Symposium.

[6]  Paul Ferrand,et al.  Multi-tap digital canceller for full-duplex applications , 2017, 2017 IEEE 18th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC).

[7]  Donghyun Lee,et al.  2×2 MIMO in-band full-duplex radio front-end with 50 dB self-interference cancellation in 90 MHz bandwidt , 2017, 2017 IEEE MTT-S International Microwave Symposium (IMS).