Rf-Ecg

Abstract

As an important indicator of autonomic regulation for circulatory function, Heart Rate Variability (HRV) is widely used for general health evaluation. Apart from using dedicated devices (e.g, ECG) in a wired manner, current methods search for a ubiquitous manner by either using wearable devices, which suffer from low accuracy and limited battery life, or applying wireless techniques (e.g., FMCW), which usually utilize dedicated devices (e.g., USRP) for the measurement. To address these issues, we present RF-ECG based on Commercial-Off-The-Shelf (COTS) RFID, a wireless approach to sense the human heartbeat through an RFID tag array attached on the chest area in the clothes. In particular, as the RFID reader continuously interrogates the tag array, two main effects are captured by the tag array: the reflection effect representing the RF-signal reflected from the heart movement due to heartbeat; the moving effect representing the tag movement caused by chest movement due to respiration. To extract the reflection signal from the noisy RF-signals, we develop a mechanism to capture the RF-signal variation of the tag array caused by the moving effect, aiming to eliminate the signals related to respiration. To estimate the HRV from the reflection signal, we propose a signal reflection model to depict the relationship between the RF-signal variation from the tag array and the reflection effect associated with the heartbeat. A fusing technique is developed to combine multiple reflection signals from the tag array for accurate estimation of HRV. Experiments with 15 volunteers show that RF-ECG can achieve a median error of 3% of Inter-Beat Interval (IBI), which is comparable to existing wired techniques.

Remote Multi-Person Heart Rate Monitoring with Smart Speakers: Overcoming Separation Constraint

“…In addition to respiration sensing, [ 25 , 26 , 27 ] have demonstrated the possibility of heart rate detection using the these radar technologies. However, because heartbeat-induced chest displacement is subtle and always drowned out by respiration, only a few papers [ 6 , 11 , 28 ] have provided results for heart rate monitoring of more than one person; all of these papers require the subjects to be separated by a minimum of 1 to 2 m, making it infeasible to monitor two people sitting next to each other or sharing a bed. Furthermore, such RF-based systems require dedicated hardware, which generally leads to high cost.…”

Understanding Driving Stress in Urban Bangladesh: An Exploratory Study, Wearable Development and Experiment

“…These factors drive stress [85,87,88,89,90], particularly in developing countries, and worsen the situation. Existing researchers studied the impact of drivers' stress levels [66,73,75] and offered wearables [51,72,75,78,83,84,85,86,90,91] as useful in stress management in the developed country context. Nevertheless, driving stress still needs to be explored in developing countries [1,2], where driving is challenging.…”

Beam Control and Interference Nulling of ESPAR Antenna for WSN Communication

“…Any network with low power consumption and high e ciency will be an important issue. Therefore, in this article, we have designed a large network with low power consumption and superior performance to the sensor network with as little interference as possible [1][2][3][4][5][6][7][8][9][10][11][12].…”

“…Only after xing the position of the tags, the SBS will capture the information signal [13][14][15][16][17][18][19][20][21][22][23][24]. ESPAR antennas could easily adopt with the massive WSN localization systems; it can also operate at the ISM frequency band of 2.4 GHz or other frequency bands [1][2][3][4][5][6][7].…”