Title page for ETD etd-05242007-140931

Type of Document

Master's Thesis

Author

Brennan, Matthew Thomas

Author's Email Address

eedomer@gmail.com

URN

etd-05242007-140931

Title

Spatial Diversity Gains in Wireless Sensor Networks through Controlled Limited Mobility: An Experimental Approach

Degree

Master of Science in Electrical Engineering

Department

Electrical Engineering

Advisory Committee

Advisor Name	Title
Prof. Martin Haenggi	Committee Member

Keywords

wireless sensor networks
mobile
diversity gain

Date of Defense

2007-04-24

Availability

unrestricted

Abstract

While Wireless Sensor Networks (WSNs) are a rapidly growing field, they still face many challenges. Some of these issues such as
critical nodes, small-scale fading, and hidden nodes can be mitigated through the application of controlled limited mobile (COLMO) systems. Small movements on the scale of a fraction of the
carrier wavelength can prove to dramatically change the received signal strength (RSS) and thus, link quality. With the proper sampling, it is possible to place a mobile node in a position with favorable multipath fading and greatly increase the link quality. This ability could have huge ramifications on the network, and new
routing paths are enabled; therefore, new metrics and trade-offs need to be considered.

By placing a Mica mote on a rotating turntable, the mote has the ability to control the location the platform so that the mote can be placed where desired. The performance of the mobile sink was
analyzed in environments with various forms of fading to determine how the diversity gain of this system compares to a MIMO design.

Several factors affecting the performance of the mobile sink were explored. One important issue is whether the received signal strength indicator (RSSI) or the link quality indicator (LQI) would
be the most effect link quality metric. Also, the thesis determines how the sampling rate of the sampled channel affects the general performance of the mobile node.

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