DLT – Page 4 – IEEE Sweden VT/COM/IT Chapter

IEEE Distinguished Lecture at Chalmers University of Technology

We invite you to an IEEE Distinguished Lecture by Prof. Ekram Hossain from University of Manitoba, Winnipeg, Canada. The seminar is organized by the Department of Signals and Systems, Chalmers University of Technology.

Time: Mon Sept 12, 2016, at 14:00-15:00 plus time for Q&A
Location: Room EA, floor 4, EDIT building, Hörsalsvägen 11, Campus Johanneberg, Chalmers University of Technology, Gothenburg

Title: On Coalition-Based Cooperative Packet Delivery in Vehicular Delay-Tolerant Networks Under Uncertainty

Abstract:
Cooperative packet delivery can improve the data delivery performance in wireless networks by exploiting the mobility of the nodes, especially in networks with intermittent connectivity, high delay and error rates such as vehicular delay-tolerant networks (VDTNs). For such a network, we study the problem of rational coalition formation among vehicular nodes to cooperatively deliver packets to other nodes in a coalition. Such coalitions are formed by vehicular nodes which can be either well-behaved or misbehaving in the sense that the well-behaved nodes always help each other for packet delivery, while the misbehaving nodes act selfishly and may not help the other nodes. A Bayesian coalitional game model is developed to analyze the behavior of mobile vehicular nodes in coalition formation in presence of this uncertainty of node behavior (i.e., type). Given the beliefs about the other mobile nodes’ types, each mobile node makes a decision to form a coalition, and thus the coalitions in the network vary dynamically. A solution concept called Nash-stability is considered to find a stable coalitional structure in this coalitional game with incomplete information. We also consider another solution concept, namely, the Bayesian core, which guarantees that no node has an incentive to leave the grand coalition. The Bayesian game model is extended to a dynamic game model for which we propose a method for each vehicular mobile node to update its beliefs about other vehicular nodes’ types when the coalitional game is played repeatedly.

Biography:
Ekram Hossain (IEEE Fellow) is a Professor in the Department of Electrical and Computer Engineering at University of Manitoba, Winnipeg, Canada. He is a Member (Class of 2016) of the College of the Royal Society of Canada. He received his Ph.D. in Electrical Engineering from University of Victoria, Canada, in 2001. Dr. Hossain’s current research interests include design, analysis, and optimization of wireless/mobile/cognitive/green communications networks with emphasis on 5G cellular, applied game theory and network economics. He has authored/edited several books in these areas (http://home.cc.umanitoba.ca/~hossaina). He was elevated to an IEEE Fellow “for contributions to spectrum management and resource allocation in cognitive and cellular radio networks”. Currently he serves as the Editor-in-Chief for the IEEE Communications Surveys and Tutorials and an Editor for IEEE Wireless Communications. Also, he is a member of the IEEE Press Editorial Board. Previously, he served as the Area Editor for the IEEE Transactions on Wireless Communications in the area of “Resource Management and Multiple Access” from 2009-2011, an Editor for the IEEE Transactions on Mobile Computing} from 2007-2012, and an Editor for the IEEE Journal on Selected Areas in Communications – Cognitive Radio Series from 2011-2014. Dr. Hossain has won several research awards including the IEEE Communications Society Transmission, Access, and Optical Systems (TAOS) Technical Committee’s Best Paper Award in IEEE Globecom 2015, University of Manitoba Merit Award in 2010, 2013, 2014, and 2015 (for Research and Scholarly Activities), the 2011 IEEE Communications Society Fred Ellersick Prize Paper Award, and the IEEE Wireless Communications and Networking Conference 2012 (WCNC’12) Best Paper Award. He was a Distinguished Lecturer of the IEEE Communications Society (2012-2015). He is a registered Professional Engineer in the province of Manitoba.

IEEE Distinguished Lecture Tour

The IEEE joint VT/COM/IT Sweden Chapter Board, and the ACCESS Linnaeus Center, are delighted to invite you to an IEEE Distinguished Lecture by Prof. Urbashi Mitra, University of Southern California, USA. Prof. Mitra will be visiting KTH, Ericsson in Kista, Uppsala University, Chalmers University of Technology, and Linköping University according to the agenda below.

The lectures will be held on:

Wednesday September 2nd in Stockholm, at 13.30 hosted by the ACCESS Linnaeus Center,

Location: Lecture Theatre K53, Teknikringen 28, floor 5, KTH City Campus; https://www.kth.se/places/room/A43:15/585

Title: Biological Communication Systems: Engineered and Natural

Abstract: See below.

Friday September 4rd in Uppsala, at 13.15 hosted by Signal and Systems

Location: Room 1211 (floor 2, Building 1) ITC, Polacksbacken, Lägerhyddsvägen 2, Uppsala

Title: Biological Communication Systems: Engineered and Natural

Abstract: See below

Monday September 7th in Gothenburg, at 13.00 hosted by the Communications Systems Division

Location: Lecture hall ED, EDIT building, Chalmers campus Johanneberg http://maps.chalmers.se/#3bc54704-a690-4476-b886-3a39429f9612

Title: Biological Communication Systems: Engineered and Natural

Abstract: See below

Tuesday September 8th in Linköping, at 10.15 hosted by Communication Systems

Location: Algoritmen

Title: Wireless channel Estimation: Opportunities for Exploiting Structure and Sparsity

Abstract: See below

Abstracts:

Biological Communication Systems: Engineered and Natural

The prospect of biological communication systems is nearing a reality. Such systems can be viewed from two perspectives: the construction of engineered biological communication systems exploiting recent advances in nano-machines or the investigation of existing natural systems wherein a communication framework can enable design, control and enhanced understanding. In this talk, both perspectives will be examined. In molecular communication, information is conveyed via molecules versus electromagnetic waves. In particular, diffusion-based molecular communication most closely remembers conventional wireless communication. Diffusion-based systems do not require prior communication link infrastructure, but do depend on the presence of transmitting and receiving nano-machines. Several modulation and transceiver designs for molecular communications will be reviewed and the capacity of such links examined. Properties of diffusion and the inherent inter-symbol interference are taken into consideration resulting in novel channel models that necessitate new designs and analysis. Such systems have application in health-care and in-body drug delivery systems. From the second perspective, we examine the modeling of microbial communities. In particular, we examine the electron transfer mechanism in living cells and its role in cell-to-cell interaction. We describe a new queueing theoretic model for the internal workings of a bacterium as well as methods based on statistical physics to scale up the queuing models. Preliminary experimental comparisons show a good fit for the model. Our goal is to couple modeling with experiment to optimize the design of microbial fuel cells which are a very promising renewable energy source. Furthermore, we adapt our initial model in order to develop capacity results for bacterial cables which are akin to multi-hop networks in wireless communications. The ultimate goal is to develop methods for three-dimensional biofilms.

Wireless channel Estimation: Opportunities for Exploiting Structure and Sparsity

Wireless communication systems typically require some form of channel state information in order to provide high performance. Traditionally, wireless channels are modeled as linear systems, which could be time-varying depending on the communication scenario. With the advent of very wideband communication and high speed applications, channel estimation becomes more challenging. Herein we show how exploiting structure inherent in many wireless communication channels can overcome challenges introduced by modern wireless applications. In many wideband signaling scenarios, channels can be modeled as sparse. To be truly practical, one must consider the effects of practical channels (not purely sparse) and transceiver characteristics such as bandlimited pulse shapes in order to design highly accurate channel estimation. We propose hybrid channel models suitable for ultrawideband radio and underwater acoustic systems based on both sparse and diffuse components and provide asymptotic performance analyses. These hybrid models can be extended to time-varying channels. We show that vehicle-to-vehicle channels, in particular, show further structure in the form of both sparse specular components and groups of diffuse components. A new channel estimation based on a nested thresholding algorithm is shown to be optimal for this channel structure and offers strong performance improvement over previous methods. Finally, we examine truly wideband channels where mobility induces Doppler scaling (versus Doppler shifts as approximated in narrowband systems). We show that OFDM signaling after passing through such a multi-scale, multi-path channel has a low rank representation. This feature can be employed to improve robustness; we eventually pose the channel estimation problem as a structured spectral estimation where sparsity can be exploited with classical spectral techniques. Strong performance gains are achieved over previously proposed methods.