Liu, YitingTang, ZhifengYang, Nan2026-06-112026-06-1197983315032081090-3038ORCID:/0000-0003-4913-3587/work/217151154ORCID:/0000-0002-9373-5289/work/217156198https://hdl.handle.net/1885/733811032We present comprehensive analysis of the communication and sensing performance of a terahertz (THz) integrated sensing and communication system. Notably, we adopt the multi-cluster fluctuating two-ray (MFTR) model to characterize the small-scale fading of THz transmission with high generality. We derive closed-form expressions for the probability density functions (PDFs) of the communication and sensing signal-to-noise ratios and signal-to-interference-plus-noise ratios, covering both uplink and downlink scenarios under communication-centric and sensing-centric configurations. Based on the PDFs, we further derive the outage probabilities and detection probabilities to evaluate the communication and sensing performance, respectively. Using simulations, we verify the accuracy of our analysis and reveal key insights into the impacts of system parameters, such as fading severity and transmit power, on the system performance.This work was supported by the Australian Research Council Discovery Project under Grant DP230100878.enPublisher Copyright: © 2025 IEEE.integrated sensing and communicationsmulti-cluster fluctuating two-ray fadingperformance analysisTerahertz202510.1109/VTC2025-Fall65116.2025.11310618105032405346