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Events for May 16, 2006

• May

  16

  Cross-layer Optimization for Wireless Networks with Multi-Receiver Diversity

  Tue, May 16, 2006 @ 03:30 PM - 04:30 PM

  Ming Hsieh Department of Electrical and Computer Engineering

  Conferences, Lectures, & Seminars

  
  

  CSI INTERNAL SEMINARSpeaker: Prof. Michael NeelyAbstract: We consider the problem of communicating data from multiple traffic streams over an ad-hoc wireless network with time varying channels, user mobility, and possible transmission errors. Our network model is well suited for stochastic environments where exact channel conditions are difficult to assess, such as underwater networks of acoustic transmitters (where ocean dynamics and large delays create channel uncertainty), and land networks with mobility (where knowledge of which receivers are currently within transmission range may be uncertain). To communicate in these extreme environments, we exploit the broadcast advantage of wireless networks. Specifically, a single transmission might be overheard by a set of potential receivers. This creates a natural multi-receiver diversity gain, where the probability that at least one node successfully receives the transmission can be much larger than the success probability of any pre-specified receiver. To fully exploit the multi-receiver diversity gain, network routing algorithms must be designed with the flexibility of dynamically adjusting routing decisions after each packet is transmitted. This functionality affects network design at all networking layers, and is a hot topic of current research. In this talk, we present novel cross-layer control algorithms for routing, resource allocation, and flow control, with the goal of optimizing performance metrics of throughput, fairness, and power expenditure. A simple set of distributed flow control and routing algorithms are presented and shown to achieve optimality subject to a given multiple access structure, and the challenge of choosing a good multiple access structure is also discussed. Our results are based on the stochastic network optimization techniques developed in our recent work (Ph.D. Thesis 2003, INFOCOM 2003, 2005, CISS 2006, NOW Foundations & Trends 2006), including;L. Georgiadis, M. J. Neely, L. Tassiulas, "Resource Allocation and Cross-Layer Control in Wireless Networks," Foundations and Trends in Networking, Vol. 1, no. 1, pp. 1-149, 2006.M. J. Neely, "Optimal Backpressure Routing for Wireless Networks with Multi-Receiver Diversity," Conference on Information Sciences and Systems (CISS), invited paper on optimization of communication networks, March 2006.

  Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248

  Audiences: Everyone Is Invited

  Contact: Mayumi Thrasher