| COVID-19 | Coronavirus disease 2019 |
| IR | Infrared |
| FM | Frequency modulation |
| UWB | Ultra wide band |
| CSI | Channel state information |
| RSS | Received signal strength |
| ANN | Artificial neural network |
| LSTM | Long-short-term-memory |
| EER | Equal error rates |
| IBI | Inter-beat interval |
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