Successive Interference Cancellation for Communication and Radar Coexistence

The ever increasing demand for high transmission rate towards futuristic scenarios stimulates communication systems to utilize a broad spectrum which is supposed to be partially overlapped by the spectrum used by radar. In light of this, communication and radar coexistence (CARC) has developed to be the candidate scheme for the 6th generation (6G) mobile communication. However, the ineluctable interference between the two systems posed by spectral overlap will cause a sharp deterioration on communication performance and most existing approaches to suppress such inter-system interference neglect the scatters of radar signal whose power is relatively large compared with communication transmission. To this end, based on orthogonal frequency division multiplexing (OFDM) communication technique, we propose a successive interference cancellation (SIC) scheme for CARC taking the interference posed by scattering radar signal from the target into account. At the communication receiver, channel impulse response (CIR) of the scattering path is obtained through subtracting the reconstructed communication waveform so that the inter-system interference is estimated and removed. Numerical results with respect to bit error rate (BER) and spectral efficiency (SE) performances verify the effectiveness of our design.