Reducing FDD MMU form factor with active cancellation


In this paper, a multi-channel self-interference cancellation (SIC) technique is proposed to reduce the size of AWS/PCS dual-band 5G FDD massive MIMO base station. Combining two bands with small frequency offset such as PCS and AWS bands in a base station requires modification of frequency duplex cavity filters to provide a wide passband with extremely narrow gap between the passband and the stop band. Such duplexer is hard to realize. We propose a novel multi-channel SIC to allow the dual-band operation with the same form factor as the single-band base station. To verify the feasibility of this idea, a proof of concept (PoC) prototype is developed to demonstrate the feasibility of multi-channel SIC to this problem.

Author: Khurram Muhammad, Jin Yuan, Zhang Shaomin, Chance Tarver, Xinguang Xu, Yu Liu, Jie Li, Junghwan Moon, Matthew Tonnemacher, Gary Xu, Charlie Zhang

Published: IEEE/MTT-S International Microwave Symposium (IMS)

Date: Jun 19, 2022