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Tunable Frequency-Division Duplex RF Front End Using Electrical Balance and Active Cancellation.

Authors :
Laughlin, Leo
Zhang, Chunqing
Beach, Mark A.
Morris, Kevin A.
Haine, John L.
Khan, Muhammad Kalimuddin
McCullagh, Michael
Source :
IEEE Transactions on Microwave Theory & Techniques. Dec2018, Vol. 66 Issue 12, p5812-5824. 13p.
Publication Year :
2018

Abstract

This paper presents a novel, tunable, frequency-division duplexing radio frequency (RF) front end that combines passive and active self-interference (SI) cancellation. An electrical-balance duplexer is used to passively cancel transmitter noise in the receive band, and an active canceller is employed to suppress SI in the transmit (Tx)-band. Subsystem specifications are developed, and a system-level analysis of noise and SI powers in this novel architecture is provided, thereby illustrating its operation. A proof-of-concept demonstrator, built from a software-defined radio and discrete RF components, has been characterized across a range of duplex configurations in the 700–950-MHz range and also at 1900 (Long-Term Evolution (LTE) band 3) and 2600 MHz (LTE band 7). The prototype achieves an impressive 6.0–7.4-dB noise figure in the presence of a +27-dBm LTE uplink Tx blocker for duplex separations of 47.5 MHz and above. The duplexer has also been tested against reference sensitivity test cases defined in the 3GPP LTE specification, demonstrating specification compliant sensitivity in LTE bands 28 (700 MHz), 3, and 7. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00189480
Volume :
66
Issue :
12
Database :
Academic Search Index
Journal :
IEEE Transactions on Microwave Theory & Techniques
Publication Type :
Academic Journal
Accession number :
133624589
Full Text :
https://doi.org/10.1109/TMTT.2018.2851990