Enhanced Range and Velocity Estimation in Carrier Aggregated ISAC via Lattice Pilots and Coarse-to-Fine Processing

With the increasing demand for efficient utilization of spectrum resources and the similarities between radar and communication structures, integrated sensing and communication (ISAC) emerges as a promising application in the future 6G networks. However, the scarcity of spectrum resources restricts the sensing performance of ISAC systems. The proposal of carrier aggregation (CA) effectively addresses this issue by leveraging the spectrum resources across different frequency bands to achieve better sensing performance. Based on the existing CA communication architecture, this paper explores the impact of pilot design structure on range and velocity estimation in the ISAC system and proposes a coarse localization-fine estimation (CLFE) framework tailored to resolve the high-frequency ambiguity and expand the effective sensing range. Simulation results indicate that the proposed pilot structure performs better in low signal-to-noise ratio (SNR) scenarios, and the CLFE method enhances the sensing accuracy of range and velocity estimation.

• Luyao Zhou;
• Ping Yang; Gang Wu;
• Yue Xiao;
• Agata Manolova;
• Vladimir Poulkov

2025 28th International Symposium on Wireless Personal Multimedia Communications (WPMC)

https://ieeexplore.ieee.org/abstract/document/11351195