Universal filtered multi-carrier transmission with active interference cancellation

Orthogonal Frequency Division Multiplexing (OFDM) has high subcarrier side-lobe levels, which makes it vulnerable to time-frequency misalignments and thus may be not suitable for asynchronous transmission in the future 5G systems. Therefore, it is necessary to design new multi-carrier modulation technologies. Combining the advantages of OFDM and Filtered Bank based Multi-Carrier (FBMC), Universal Filtered Multi-Carrier (UFMC) has lower out-of-band leakage and supports segmented spectrum communication by filtering a series of successive subcarriers. In this paper, to further reduce inter-sub-band interference and enable more reliable communication, we incorporate Active Interference Cancellation (AIC) into the UFMC system. AIC is widely used in the multi-band cognitive OFDM systems, which can offset the interference that the primary user suffers from secondary users by skillfully inserting some interference cancellation subcarriers on both sides of the primary user. Numerical results show that our proposed UFMC-AIC scheme makes inter-sub-band interference suppression very effective and achieves a better BER performance comparing with OFDM and UFMC.