Wireless Sensor Systems for Localised and Intuitive Interaction Applications

Mr Matthew D'Souza (2008). Wireless Sensor Systems for Localised and Intuitive Interaction Applications PhD Thesis, School of ITEE, The University of Queensland.

       
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Author Mr Matthew D'Souza
Thesis Title Wireless Sensor Systems for Localised and Intuitive Interaction Applications
School, Centre or Institute School of ITEE
Institution The University of Queensland
Publication date 2008-02
Thesis type PhD Thesis
Supervisor Adam Postula
Total pages 205
Total colour pages 19
Total black and white pages 186
Subjects 290000 Engineering and Technology
Formatted abstract Wireless sensor systems are used for a variety of interactive, communication and sensing
applications. Wireless sensor systems have been mainly used to provide a communication
link for low intensive sensor data-processing applications. The types of sensing applications
using wireless sensor systems are becoming more complex and data-processing
intensive. High intensive sensor data-processing situations include real-time sensor data
streaming, user interaction, user information retrieval systems and sensor data logging.
Wireless node architectures are becoming more sophisticated in order to support mainstream
communication protocols such as Bluetooth and to provide high data processing
abilities.
This thesis investigates key aspects of wireless systems for interactive and locating applications.
Specific contributions were made in the areas of wireless transceiver architectures,
localised interactive systems, intuitive interactive systems and locating systems. Wireless
transceiver architectures suitable for interactive and multimedia applications were
discussed with a focus on Ultra Wide Bandwidth Communications and Software Radio
architectures.
Ultra Wide Bandwidth Communications was investigated as a physical layer for interactive
and multimedia wireless sensor systems due to its high data throughput rates compared to
other wireless communication protocols. A pulse spectrum modulation scheme for Ultra
Wide Bandwidth was developed and compared to other UWB modulation schemes. It
was shown by simulation that the pulse spectrum modulation scheme had a lower bit
error rate than a bi-phase UWB scheme.
Software radios can be implemented on reconfigurable platforms such as Field ProgrammableGate Arrays (FPGA). This allows for interesting sensor integration features for interactive
and multimedia wireless systems. A software radio using a single tone detection
technique for demodulation was developed and compared to a software radio receiver
that uses standard filters for demodulation.
Localised interactive systems allow users to access services specific to their current surroundings.
Two localised interactive systems using wireless sensor systems for e-tourism
and e-health applications were presented. The e-tourism application was a multimedia
guidebook that allowed users to access multimedia information about their immediate
environment using mobile computing devices. A novel pointing mechanism and a wireless
sensor system infrastructure was designed for the multimedia guidebook. An interactive
e-health application that allows a medical patient’s electrocardiogram instrument reading
to be viewed and recorded using a mobile computing device was presented. The use of
an FPGA device to implement realtime data capture/streaming critical functions as digital
logic rather than as a software process was examined. It was found that the use of
an FPGA based platform provided improvements in processing and power usage for this
application.
Intuitive interaction allows users to access information systems by using human gesture
actions such as pointing or speaking. We present a wireless Interactive Information Network
infrastructure that allowed users with various intuitive devices to interact with other
users and their environment. Intuitive devices such as smartphones and digital pens were
used. An intuitive interaction mechanism that used radio frequency identification tags to
interpret user actions was also developed and integrated into the Interactive Information
Network.
A locating sensor network that tracks users within an indoor environment was developed.
The location beacon network consisted of location beacons placed at known positions
throughout a building. Users carried a scanner or tracker beacons to allow their current
position to be tracked by a control centre. The Zigbee wireless protocol and a Received
Signal Strength Indicator (RSSI) location determining mechanism were analysed for use
in the location beacon network. It was found that the Zigbee protocol provided useful
advantages for the location beacon network compared to other protocols. Two mechanismsfor using RSSI as a proximity detector were analysed. One mechanism involved scanning
for location beacons (scanner) and the other involved continuously transmitting short
range messages (tracker). It was found that the tracker mechanism had a faster tracking
time. The location beacon network can be used not only to track people and objects in
a building but also to facilitate user interaction with services specific to their location.
Additional Notes 41,65,73,77,80,85,93,101,102,104,110,111,117,118,125,127,136,139,142

 
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Created: Thu, 06 Nov 2008, 14:05:53 EST by Mr Matthew D'souza on behalf of Library - Information Access Service