Toronto Networking Seminar

Organized by Department of Computer Science and Department of Electrical and Computer Engineering, University of Toronto

Energy-Efficient Cooperative Routing in Outage-Restricted Multihop Wireless Networks

Behrouz Maham
University of Oslo, Norway

Thursday, September 2, 4pm
Location: BAB024 (Bahen Basement) 


Due to the limited energy supplies of nodes in many applications like wireless sensor networks, energy efficiency is crucial for extending the lifetime of these networks. In this talk, we first review our recent research in the context of resource-constrained cooperative networks. Then, the problem of link cost formulation is addressed for outage-restricted multihop wireless ad hoc networks based on cooperative transmission. New cooperative routing protocols are introduced using the space-time codes for the purpose of energy savings, given a required outage probability at the destination. Two power control schemes, i.e., distributed and centralized power allocations are derived to minimize the total transmission power. Moreover, we consider the multihop transmission with interference. Efficient techniques are proposed to increase the spectral efficiency of cooperative multihop transmission. In the first scheme, incremental relaying, also known as hybrid ARQ, is embedded in the cooperative routing. In the second approach, we propose cooperative multihop communication with spatial reuse and an interference cancellation. Compared to non-cooperative multihop routing, an energy saving of 80% is achievable in line networks with 3 relays and an outage probability constraint of 10^-3 at the destination.


Behrouz Maham received the B.Sc. and M.Sc in electrical engineering, from University of Tehran, in 2005 and 2007, respectively. He worked as a system engineer from 2006 till 2007 at Iran Telecommunication Research Center. From September 2008 to August 2009 he was with the Dept. of Electrical Engineering at Stanford University, USA, as a Visiting Researcher. He got his PhD degree from the University of Oslo, Norway, in April 2010. Currently, he is a Postdoctoral fellow at the University of Oslo. He has held visiting appointments at University of Oulu, Finland, and the Alcatel-Lucent Chair at Supelec in France. His fields of interest span the broad area of scalable wireless communication and networking, with emphasis on relay techniques, MIMO multiuser techniques, performance analysis of wireless systems, and space-time coding. He has around 40 publications in major technical journals and conferences and served as a TPC member for several IEEE conferences.

Host of Talk:

Ben Liang (