Abstract
This paper presents an energy-efficient wireless ad hoc communication system and baseband transceiver for sensor networks that gather vital sign information of patients. The design of the proposed system is aimed to facilitate an energy-efficient and low-latency vital sign data transmission service. Based on this aim, the proposed system adopts multi-hop transmission and joint transmitter-receiver beamforming technique to efficiently transmit data at significantly reduced transmission power. Furthermore, to shorten the transmission latency and reduce channel contention, we proposed a novel Medium Access Control (MAC) mechanism which includes neighborhood discovery, packet collision detection and prioritized transmission scheme based on an Orthogonal Frequency Division Multiple Access (OFDMA) physical layer. Simulation of transmission power, transmission latency, and data rate, together with proposed hardware architecture, were all carried out to verify the effectiveness and feasibility of the proposed system.
Highlights
Wearable devices monitoring personal health are assuming more prominence recently
3.1.2 Orthogonal Frequency Division Multiple Access (OFDMA) user segment collision management We developed collision management based on the philosophy of avoiding collision and apply corrective measures when collision is detected to reduce the collision possibility
6.4 Discussion It is clear that multi-hop transmission can effectively enhance the energy efficiency of the system, since a large amount of transmission power can be saved at the price of an increase of 1.23 mW circuit processing power
Summary
Wearable devices monitoring personal health are assuming more prominence recently. With this comes the challenge of developing smaller, more energy-efficient communication transceivers embedded in these wearable devices. Consider a group of these wearable devices that form a small sensor network eco-system, which is responsible to collect information for health monitoring at hospitals or care facilities Vital signs, such as body temperature, heart rate, blood pressure, respiratory rate, and ECG, are all indicative of the health condition of a patient. In order to realize this system, we propose a mesh-based ad hoc wireless communication system where user nodes can transmit their data with reduced power via multi-hop transmission. To further reduce the transmission latency, we have proposed a distributed control channel access mechanism where user nodes are classified into four access classes according to the amount of vital sign data yet to be transmitted (higher classes have higher transmission priority). To alleviate congestion and deadlock in ad hoc WSN with transmit power tuning, we designed a MAC layer mechanism with continuous neighborhood discovery update and OFDMA-based resource allocation.
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