Synchronization of time in wireless ECG measurement

Wireless devices for ambulatory ECG monitoring are becoming increasingly popular. One of the challenges that wireless monitoring has to deal with is clock synchronization between the wireless sensor device and the controller device. The monitoring device is usually kept as simple as possible to maxi...

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Bibliographic Details
Published in2017 40th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO) pp. 292 - 296
Main Authors Vilhar, Andrej, Depolli, Matjaz
Format Conference Proceeding
LanguageEnglish
Published Croatian Society MIPRO 01.05.2017
Subjects
Androids
Bluetooth
Electrocardiography
Monitoring
Radiation detectors
Synchronization
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Summary:Wireless devices for ambulatory ECG monitoring are becoming increasingly popular. One of the challenges that wireless monitoring has to deal with is clock synchronization between the wireless sensor device and the controller device. The monitoring device is usually kept as simple as possible to maximize its autonomy, and is thus limited in its clock accuracy. In this article, we describe a method of off-line synchronization of data from a completely asynchronous sensor device. The sensor device sampling frequency is allowed to deviate from its declared value by more than 100 ppm, while the controlling device time is assumed to be absolutely accurate. Data synchronization is based on using two sources of timestamps for the data - the sensor device oscillator and the controller device local time. In our case the controlling device is an Android mobile phone, and the wireless technology used is Bluetooth LE. The challenges are: limited precision of time reported by the sensor device, clustering of messages on Android, and lost messages due to lossy transmission mode. The presented synchronization technique is able to achieve several orders of magnitude improvement in estimation of sample time.
DOI:10.23919/MIPRO.2017.7973437