Bluetooth technology Electrical & Computer Engineering 4 Engineering & Applied Sciences 4 Telecommunications 4 Computer network protocols 2 Equipment and supplies 2 Telecommunication 2 3D camera 1 3D surface roughness parameters 1 Application program interfaces (Computer software) 1 Arduino (Programmable controller) 1 CNN 1 FDR sensor 1 Fourier transform 1 History of engineering & technology 1 IEEE 802.11 (Standard) 1 IR-UWB radar sensor 1 Java (Computer program language) 1 LSTM 1 Microsoft Windows (Computer file) 1 Proximity detectors 1 Raspberry Pi (Computer) 1 Security measures 1 Smartphones 1 Telecomunicación 1 Wireless LANs 1 Wireless communication systems 1 accuracy 1 actigraphy 1 adaptive dropout 1