OTFS-ISAC Systems with Aerial Targets: Hybrid Precoder Design and Radar Tracking

Due to the availability of wide bandwidths in the frequency range 2 (FR2) band, sixth-generation (6G) networks can provide both radar and communication services using shared spectrum and hardware, reducing costs and enhancing efficiency via integrated sensing and communication (ISAC) systems. Motivated by the advantages of orthogonal time frequency space (OTFS) modulation in high-mobility scenarios, this paper proposes an iterative hybrid precoder design method and a radar tracking algorithm for OTFS-ISAC systems with aerial targets, i.e., drones. Information is sent to the ground user through communication links using the subarray hybrid precoder to balance radar and communication performance through a weighted summinimization framework. The cubature Kalman filter (CKF) is employed for radar prediction and tracking. Simulation results indicate that the proposed hybrid precoder design algorithm effectively balances radar and communication performance, while the CKF-based radar tracking method outperforms other nonlinear Kalman filters.