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A Cooperative Transmission Technique for Telehealth

A form of Telehealth is remote patient monitoring. We propose a generic topology for such a monitoring system and apply to it a physical layer cooperative transmission (CT) technique. The generic topology is as follows. We consider “on-body” sensors, and a hub device (such as a phone, PDA, or wireless LAN access point) that is away from the body, which can function as a central fusion node and connect to the Internet. Using CT will reduce the total power required for sensor transmission by exploiting the spatial diversity of multiple single-antenna terminals. This will increase the longevity of battery-driven on-body sensors. The opportunistic large array (OLA) is a simple CT approach that saves energy relative to conventional multihop routing by allowing all nodes that can decode to relay the message. OLA avoids the overhead of assigning clusters and cluster leaders. To date, OLA has not been considered for human body applications. In this paper, we provide a first treatment of communication using OLA for on-body sensors in the Ultra-wideband (UWB) range and investigate the potential diversity gains that can be achieved. Keywords—Body Area Networks, Sensor Networks, Opportunistic Large Arrays, Wireless Cooperative Communications