Type of Document Master's Thesis Author Anyanwu, Uchenna Kevin Author's Email Address firstname.lastname@example.org URN etd-06252012-112519 Title A Reconfigurable Random Access MAC Implementation for Software Defined Radio Platforms Degree Master of Science Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title MacKenzie, Allen B. Committee Chair DaSilva, Luiz A. Committee Member Dietrich, Carl B. Committee Member Keywords
- Random Access MAC
- Wireless Networks
- Software Defined Radio
Date of Defense 2012-06-12 Availability unrestricted AbstractWireless communications technology ranging from satellite communications to sensor
networks has benefited from the development of flexible, SDR platforms. SDR is used for
military applications in radio devices to reconfigure waveforms, frequency, and modulation
schemes in both software and hardware to improve communication performance in
harsh environments. In the commercial sector, SDRs are present in cellular infrastructure,
where base stations can reconfigure operating parameters to meet specific cellular coverage
goals. In response to these enhancements, industry leaders in cellular (such as Lucent,
Nortel, and Motorola) have embraced the cost advantages of implementing SDRs in their
cellular technology. In the future, there will be a need for more capable SDR platforms on
inexpensive hardware that are able to balance work loads between several computational
processing elements while minimizing power cost to accomplish multiple goals.
This thesis will present the development of a random access MAC protocol for the IRIS
platform. An assessment of different SDR hardware and software platforms is conducted.
From this assessment, we present several SDR technology requirements for networking
research and discuss the impact of these requirements on future SDR platforms. As a
consequence of these requirements, we choose the USRP family of SDR hardware and the
IRIS software platform to develop our two random access MAC implementations: Aloha
with Explicit ACK and Aloha with Implicit ACK. A point-to-point link was tested with
our protocol and then this link was extended to a 3-hop (4 nodes) network. To improve
our protocols’ efficiency, we implemented carrier sensing on the FPGA of the USRP E100,
an embedded SDR hardware platform. We also present simulations using OMNeT++
software to accompany our experimental data, and moreover, show how our protocol
scales as more nodes are added to the network.
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