Blind RF Self-Interference Cancellation for In-Band Distribution Link in ATSC 3.0

Wireless in-band backhaul technology was recently proposed for the next-generation TV broadcasting system with Single Frequency Networks as a spectrum and cost-efficient alternative to conventional fibre-optic or dedicated microwave links. Self-interference cancellation (SIC) is the key technology enabling wireless in-band backhaul to operate in the more spectrum efficient full-duplex mode. For the broadcasting headend transceiver, although the separation between the co-located transmit and receive antennas and digital/baseband SIC can achieve significant self-interference reduction and cancellation, it is desirable to have an analog/Radio Frequency (RF) SIC before the digital/baseband SIC, to relax the hardware dynamic range requirement and reduce the effect of nonlinear distortions due to the hardware imperfection as well as adjacent channel interferences. In this paper, a frequency-domain blind RF SIC (RF-SIC) framework with a novel filter weight optimization algorithm is proposed, which does not require a training process and can achieve fast convergence with the capability of tracking the self-interference channel variation with affordable computation complexity. The proposed techniques can work with different broadcasting and communications systems such as ATSC 3.0, DVB-T/T2, WiFi and 4G/5G.