I. Introduction
As the Internet of Things (IoT) technology grows by leaps and bounds, smart healthcare has become a key research direction in the medical field [1], [2]. Features, such as automation, digitization, and information sharing have made smart hospitals a focal point of attention [3]. Timely assessment of patients’ physiological conditions can prevent further complications and even avoid life-threatening situations, especially in intensive care units (ICUs). Moreover, the increasingly urgent demand for aging health care requires home-based monitoring devices to be designed to further expand the application scenarios and monitoring scope of the IoT technology [4]. The issue of diverse measurement indicators can be tackled by multisensor fusion to achieve real-time monitoring of multiple vital sign parameters, enabling health warnings and disease monitoring [5]. Therefore, continuous monitoring of patients’ vital signs is crucial.