A Noncontact Breathing Disorder Recognition System Using 2.4-GHz Digital-IF Doppler Radar. - Heng Zhao 002; Hong Hong; Dongyu Miao; Yusheng Li 002; Haitao Zhang; Yingming Zhang; Changzhi Li; Xiaohua Zhu 001 (IEEE J. Biomed. Health Informatics, 2019)