Monday November 12 4:00 - 4:50 PM Kelley 1001
Bechir Hamdaoui Assistant Professor School of Electrical Engineering & Computer Science Oregon State University 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) 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 M.S. degree in Electrical and Computer Engineering (2002), M.S. Degree in Computer Sciences (2004), and Ph.D. degree in Computer Engineering (2005) all from the University of Wisconsin at Madison. In September of 2005, he joined the Real-Time Computing Lab at the University of Michigan at Ann Arbor as a postdoctoral researcher. Since September of 2005, he has been with the School of EECS at OSU as an assistant professor. His research interests span various topics in the areas of wireless computer networking and data communication systems. Specifically, he is currently focusing on, and addressing problems in, (1) wireless sensor networks: data aggregation and routing, energy efficiency, video, quality-of-service; (2) cognitive radio networks: adaptive spectrum access, opportunistic MAC protocols, dynamic bandwidth sharing, multi-user coexistence and coordination; and (3) MIMO-based cross-layer techniques: network coding, interference suppression, energy-efficiency.
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