WiCG: In-Body Cardiac Motion Sensing Based on a Mix-Medium Wi-Fi Fresnel Zone Model. - Pei Wang; Anlan Yu; Xujun Ma; Rong Zheng 001; Jingfu Dong; Zhaoxin Chang 001; Duo Zhang; Djamal Zeghlache; Daqing Zhang 001 (IEEE Trans. Mob. Comput., 2025)