Cooperation in Wireless Networks: Node Assignment Strategies

Speaker: Prof. Aria Nosratinia, University of Texas, DallasAbstract: I will discuss cooperative wireless networks, in particular the non-altruistic variety where there are no pure relays and all nodes that are "on" have data of their own to transmit. In this context, a coded cooperation framework will be presented, where cooperation is achieved in the context of channel coding. Then we will proceed to discuss node assignment for cooperation. In general, not all nodes in a wireless network may wish to be involved in every transmission. Therefore, in a multi-node cooperation protocol, one needs strategies of grouping the nodes. Such strategies are examined under two types of constraints: distributed control and centralized control. We shall see that there exist simple distributed strategies that guarantee full diversity (in the number of decoding attempts) over the network. Since the distributed strategies already achieve full diversity, centralized control does not provide any additional diversity gain, however, based on various amounts of channel state information being available to the central controller, significant gains are still possible over and above distributed control. These gains are characterized under a variety of conditions.Bio: Aria Nosratinia is associate professor of electrical engineering at the University of Texas, Dallas (UTD). Currently he is spending a sabbatical leave at UCLA. Aria received his Ph.D. in electrical and computer engineering from the University of Illinois at Urbana-Champaign. He has been a visiting scholar with Princeton University, Princeton, New Jersey and a visiting professor and faculty fellow at Rice University, Houston, Texas. His interests lie in the broad area of information theory, coding and signal processing, in particular various problems related to wireless networks and transmission of multimedia data over such networks. He received the National Science Foundation career award in January 2000. He serves as associate editor for the IEEE Transactions on Image Processing and IEEE Wireless Communications.Host: Professor Giuseppe Caire, caire@usc.edu, x.04683

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

Audiences: Everyone Is Invited

Contact: Mayumi Thrasher