In-Band Full-Duplex Communications with MIMO in ATSC 3.0

Wireless in-band backhaul, i.e. in-band distribution links (IDL) and inter-tower communications networks (ITCN) were previously proposed as key enabling technologies for the next-generation digital broadcasting systems, a.k.a. the Advanced Television Systems Committee (ATSC) 3.0 system. Both ITCN/IDL can be operated in the spectrum-efficient in-band full-duplex (IBFD) mode and the same frequency band is shared between the broadcast service signal and the ITCN/IDL signals. Integrating multi-input multi-output (MIMO) into ITCN/IDL transmission is desirable to increase the throughput and reduce the portion of the spectrum occupied by ITCN/IDL. Self-interference cancellation (SIC) in IBFD communications with the dual-polarization MIMO in ATSC 3.0 is investigated in this paper. A MIMO SIC was previously proposed by the authors which is capable to cancel both the co-polarization and cross-polarization self-interferences without requiring a dedicated training phase for the SIC filter weight estimation. Foregoing a dedicated training phase is more spectrum efficient and flexible in system design, however, it results in the presence of the remote signal of interest as an “intrinsic noise” in the SIC filter weight estimation. An iterative “intrinsic noise” cancellation scheme is proposed in this paper to further improve the MIMO SIC performance.