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SUMMARY:Advanced Physical Layer Techniques for Wireless Multihop Networks 
 - Adrian Loch (Technische Universität Darmstadt)
DTSTART:20150129T150000Z
DTEND:20150129T160000Z
UID:TALK56395@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:Today\, the performance of Wireless Multihop Networks (WMNs) i
 s still limited by the lower layers. While recent cross-layer approaches t
 ake advantage of the characteristics of the medium\, they are often based 
 on traditional physical layers such as OFDM. State-of-the-art techniques u
 sed in one-hop scenarios\, such as Orthogonal Frequency-Division Multiple 
 Access (OFDMA) or Interference Alignment (IA)\, pose a significant challen
 ge in practical multihop networks\, since typically Channel State Informat
 ion (CSI) at the transmitter is required. Due to its volatile nature\, dis
 seminating timely CSI in the network is often infeasible. We propose Corri
 dor-based Routing to enable advanced physical layers in WMNs. Instead of r
 outing packets from node to node\, we forward them along fully-connected g
 roups of nodes. As a result (1) CSI only needs to be exchanged locally to 
 enable cooperation in a group\, and (2) groups can adaptively choose the b
 est physical layer technique according to CSI. We present a cross-layer pr
 otocol that realizes Corridor-based Routing in WMNs. Moreover\, we design 
 corridor forwarding mechanisms based on OFDMA and IA. We implement Corrido
 r-based Routing in practice on a software-defined radio platform\, and sho
 w that we achieve significant throughput gains for both OFDMA and IA.\n\nB
 io: Adrian Loch is a PhD student at the Secure Mobile Networking Lab at Te
 chnische Universität Darmstadt (Germany) since April 2011. Before\, he gr
 aduated in Electrical Engineering from Universidad Politécnica de Madrid 
 (Spain). His research interests are routing\, performance\, and security i
 n wireless networks. In particular\, he focuses on practical cross-layer d
 esign for wireless multihop networks using software-defined radios.\n
LOCATION:SS03\, Computer Laboratory\, William Gates Builiding
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