Performance Model of Terahertz Joint Radar-Communication Systems Under Random Mobility

Terahertz (THz) joint radar-communication (T-JRC) has been envisioned as a method to overcome the challenges in THz communications. Recent works mainly emphasize the tradeoffs between radar estimations and data communications, unable to characterize the mutual benefit relationship as a key feature of T-JRC system. In this work, a comprehensive performance model considering both tradeoff and benefit relationship is derived for THz systems under random mobility. T-JRC performance in three typical cases is analyzed to present the universality of the model. Additionally, the bounds of T-JRC performance are acquired in terms of the communication data rate and a novel radar rate extended from the traditional works. Finally, the simulations of T-JRC systems considering mobility, beamwidth and distance are performed to validate the derived models. Numerical results indicate that the mutual benefit relationship dominates in low radar rate, while tradeoffs are crucial when the radar estimations are sufficient.