A sensor network is comprised of a large number of sensor nodes with limited
power, which collect and process data from a target domain and transmit information
back to specific sites, such as, headquarters and disaster control centers. Since the
wireless communication channel shared by sensor nodes is broadcast in nature, a
Medium Access Control (MAC) protocol is needed to specify how nodes share the
channel, which plays a central role in the performance of a sensor network.
In this thesis, we investigate the performance of randomized and time hopping
Aloha MAC protocols by theoretical analysis and simulations. The first part of our
research formulates the multiple access collision problem raised from the ARGOS
satellite telemetry system. We analyze the factors that affect the performance of the
system and derive the mathematical model. We simulate the system and generate
valuable performance results for design purpose. In the second part of the thesis,
we extend our research to sensor networks with Impulse Radio Ultra WideBand (IR-
UWB) physical layer defined in IEEE802.15.4a. We analyze and model the time
hopping Aloha MAC protocol and verify the results with simulations using NS-2
network simulator.
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/1820 |
| Date | 04 November 2009 |
| Creators | Ma, Haoling |
| Contributors | Cai, Lin |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | Available to the World Wide Web |
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