Wideband Active Analog Self-Interference Cancellation for 5G and Beyond Full-Duplex Systems

摘要

This paper investigates an efficient way to suppress the significant self-interference (SI) signal within wide-band to meet the requirements of 5G and beyond communication systems. We first introduce the novel analog canceller design which utilizes optical components to construct sufficient effective taps to enable wideband active analog cancellation. A novel tuning algorithm is then proposed to reduce the usage of optical carriers to save the space and energy of such design. We also explored the minimum efficient number of taps under various hardware conditions to avoid spare taps created. To the best of our knowledge, it is the first time such an analytical approach is proposed for an efficient canceller design. Simulations results demonstrate that the 5G In-Band Full-Duplex (IBFD) system can be implemented with the help of the novel optical domain based design. With a 12 bits analog-to-digital converter (ADC) and 20 effective taps, it is experimentally proved that the SI is efficiently suppressed in a 3GPP LTE specifications compatible system within 1GHz of operational bandwidth.