Real-time cardiac monitoring is an important component of body sensor networks. Due to its typical bandwidth requirements, Bluetooth is often the protocol of choice for wireless transmission from the cardiac monitoring nodes. In order to make the node small and wearable, improving energy efficiency is desirable as otherwise we end up either making the battery too big or changing it too often. In this paper we focus on optimizing energy consumption in cardiac data transmission while providing low latency. We show that this problem can be posed as a geometric program, which belongs to class of convex optimization problems. We analyse the issue based on data bandwidth requirements and latency constraints. The results are mapped to different data type specifications in Bluetooth and recommendations are drawn accordingly.
Key words: cardiac monitoring, convex optimisation, Bluetooth, energy consumption
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