Successive interference cancellation-based channel estimation for self-interference cancellation in in-band full-duplex systems

The integrated sensing and communications (ISAC) system has become a promising scheme for combining sensing and communication features to send data and sense the physical space concurrently. Although it aims to understand the channel condition and communication environment with sensing capability, it still requires sustainable high-data transmission with efficient spectrum usage. The in-band full-duplex (IBFD) system can be a possible solution to support high data transmission while increasing spectrum efficiency. Since IBFD has a self-interference issue, one of the significant factors that deteriorate its performance, we need to investigate possible solutions to resolve this matter. In this paper, we present an improved self-interference cancellation receiver with successive interference cancellation (SIC)-based channel estimation for the IBFD system. Since SIC aims to mitigate the multiple interference effects, our proposed algorithm applied SIC to the channel estimation for the performance gain. Our results show that SI cancellation with SIC-based channel estimation improves the IBFD bit error rate (BER) of the new radio (NR) for the ISAC system.