Intelligent wireless walls for contactless in-home monitoring

• DOI: 10.1038/s41377-022-00906-5
• Publication Date: 2022-07-07T12:03:34Z
• Authors: Muhammad Usman; James Rains; Tie Jun Cui; Muhammad Zakir Khan; Jalil ur Rehman K...; Muhammad Ali Imran; Qammer H. Abbasi
• Keywords: independent living; intelligent wireless walls; QC350-467; 02 engineering and technology; Optics. Light; sensing techniques; Article; TA1501-1820; Atomic and Molecular Physics; Electronic; 0202 electrical engineering, electronic engineering, information engineering; Applied optics. Photonics; Optical and Magnetic Materials; and Optics

Human activity monitoring is an exciting research area to assist independent living among disabled and elderly population. Various techniques have been proposed recognise human activities, such as exploiting sensors, cameras, wearables, contactless microwave sensing. Among these, the sensing has recently gained significant attention due its merit solve privacy concerns of cameras discomfort caused by wearables. However, existing a basic disadvantage requiring controlled ideal settings for high-accuracy detections, which restricts wide adoptions in non-line-of-sight (Non-LOS) environments. Here, we propose concept intelligent wireless walls (IWW) ensure high-precision complex environments wherein conventional invalid. The IWW composed reconfigurable surface (RIS) that can perform beam steering beamforming, machine learning algorithms automatically detect activities with high accuracy. Two are considered: one corridor junction scenario transmitter receiver separate sections other multi-floor placed on two different floors building. In each aforementioned environments, three distinct body movements considered namely, sitting, standing, walking. subjects, male female these both It demonstrated provide maximum detection gain 28% 25% compared traditional without RIS.