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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><h2><span style='font-family:"Tahoma","sans-serif"'>PhD Dissertation Defense<o:p></o:p></span></h2><p class=MsoNormal><b><span style='font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Tahoma","sans-serif";text-transform:uppercase'>TOWARD RELIABLE AND ROBUST WIRELESS PERSONAL AREA NETWORKS<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><o:p> </o:p></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Tahoma","sans-serif"'>Guanbo Zheng<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'>Date: Wednesday, July 17<sup>th</sup>, 2013<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'>Location: </span></b><span style='font-size:12.0pt'>ECE Small Conference Room, N358<b><o:p></o:p></b></span></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'> Time: </span></b><span style='font-size:12.0pt'>10:00 am <b><o:p></o:p></b></span></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'>Committee Chairs: <o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt'>Dr. Zhu Han & Dr. Rong Zheng<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><o:p> </o:p></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt'>Committee Members:<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt'>Dr. Yuhua Chen<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt'>Dr. Jiming Bao<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt'>Dr. Bo Sun<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt'>Dr. Cunqing Hua<b> <o:p></o:p></b></span></p><p class=MsoNormal align=center style='text-align:center'><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:1.5in'>In recent years, wireless personal area networks (WPANs) have been widely deployed to replace cable<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>connections and provide low power, low cost wireless connectivity to facilitate seamless operation<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>among wireless devices centered around an individual person. However, pervasive deployment of<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>WPANs has introduced a lot of challenging problems on coexistence and resource provisioning. First,<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>commercial‐of‐the‐shelf (COTS) WPAN devices typically provide limited information regarding the<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>current condition of wireless channels. The lack of detailed PHY knowledge usually leads to misinformed<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>decisions and under‐utilization of available resources. In this dissertation, we revisit the issue of link<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>quality prediction in IEEE 802.15.4 low rate WPANs analytically and experimentally. By deciphering LQI<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>readings available in Zigbee radios with CC2420 chipset, we demonstrate for the first time that LQI truly<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>reflects the signal‐to‐noise ratio (SNR) at the receiver. Furthermore, to predict the instantaneous link<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>quality, we develop an inference model under different channel environments that uses instantaneous<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>LQI as input. We believe it will lead to more informed resource management decisions in WPANs.<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>Second, by sharing same unlicensed ISM bands, one WPAN device not only has to coexist with other<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>WPAN devices, but also other co‐channel nearby wireless technologies like WiFi. Without the knowledge<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>of neighbors and contention graph, they may interfere with each other, resulting in severe quality‐of service<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>(QoS) degradation. To achieve better coexistence in ad‐hoc WPANs where the peer‐to‐peer<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>topology is adopted, we propose efficient solutions to joint neighbor discovery and contention graph<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>inference. Specifically, two inference approaches are presented analytically, a binary inference model<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>and a location based inference model.<o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:1.5in'>Lastly, the newly developed WPAN applications demand high data rate and stringent requirements on<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>service disruption, which poses more challenges on designing reliable and robust WPANs. In this<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>dissertation, we consider IEEE 802.15.3c WPANs and propose a robust relay placement and routing<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>selection solution for better resource provisioning. Specifically, two robust problems are formulated,<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>robust minimum relay placement (RMRP) and robust maximum utility relay placement (RMURP). We<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>first consider an interference‐free model, and then extend the work by incorporating a classic<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>directional antenna model and characterizing the link contention. Efficient algorithms are developed to<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>solve both problems and have been shown to incur less service disruption in presence of moving<o:p></o:p></p><p class=MsoNormal style='margin-left:1.5in'>subjects that may block the LOS paths in the environment.<o:p></o:p></p></div></body></html>