ECE Faculty Candidate
Wednesday **Special date, time, and location** May 23 11:00 - 11:50 AM Kelley 1007 Bechir Hamdaoui Postdoctoral Research Fellow Real-Time Computing Lab University of Michigan The bandwidth-shortage problem: lack of efficiency or scarcity of resources? We have recently been witnessing an explosive and ever-increasing demand for, and hence a shortage of, the wireless network bandwidth resource due to the rapidly growing wireless-based services and networks. Preliminary studies indicate that this foreseen bandwidth shortage is not so much due to the scarcity of spectrum, but due to its current inefficient use. Therefore, it is important to explore innovative ways that make efficient use of this limited resource. Fortunately, recent technological advances make it possible to realize SDRs (Software-Defined Radios) or smart radios that, unlike traditional radios, can switch from one frequency band to another at minimum cost, thereby enabling dynamic multi-band access and sharing. On the other hand, recent advances in signal processing combined with those in antenna technology enabled MIMO (Multiple-Input Multiple-Output) capabilities, thus creating a great potential for enhancing the throughput of wireless networks. In this talk, I first present a framework that exploits the MIMO technology to maximize the overall achievable throughput of multi-hop wireless networks. The framework models and identifies the potential and limits of the spatial reuse and spatial multiplexing benefits offered by MIMO while accounting for cross-layer coupling effects. Then, I show that SDRs and MIMO together form a complete and potential means of providing next-generation wireless networks with three-dimensional opportunistic bandwidth-access along time, frequency, and space, thereby improving bandwidth-utilization efficiency. Biography: Bechir Hamdaoui received the Diploma of Graduate Engineer (6-year program) from the National School of Engineers at Tunis, Tunisia, in 1997. He received M.S. and Ph.D. degrees both in Electrical & Computer Engineering from the University of Wisconsin at Madison in 2002 and 2005, respectively. From 1998 to 1999, he worked as a quality control and planning engineer on power generation plant project under the supervision of FIAT Avio. He was an intern at Telcordia during the summer of 2004. Since his graduation in August of 2005, he joined Professor Shin's Real-Time Computing Lab at the University of Michigan at Ann Arbor as a postdoctoral research fellow. His research experience and interests span various topics in the area of wireless networking and data communication systems. Specifically, he focuses on developing techniques and designing protocols that provide next-generation wireless networks with the capabilities of adaptive and dynamic sharing and access to the limited spectrum/bandwidth; efficient use of the limited energy resources; and reliable support of applications with QoS requirements.
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