Adaptive Interference Cancellation Scheme for OFDM-based ISAC System

Interference cancellation between the echo of the sensing signal and the communication signal is an challenging issue in integrated sensing and communication (ISAC) systems, especially when the directions of arrival (DoAs) of the echo signal and the communication signal are the same. In this paper, an echo cancellation scheme based on adaptive filtering is proposed for the ISAC system, and the smoothed rank profile (SRP) algorithm and spatial smoothing algorithm are jointly employed. After the echo signal and the uplink communication signal are separated, the motion state of the sensing target is estimated. Simulation results show that the proposed adaptive filtering scheme can improve both the communication performance and the sensing performance.