Yangyang Xu: An Alternating Direction Algorithm for Matrix Completion with Nonnegative Factors. (Paper)
Yuan Shen: The Application of PPA Contraction in TVL1 Problem. (Slides)
Archive for February, 2011
Introduction and Overview of Topics II
February 8th, 2011 by wd5Cooperative Compressive Sensing for Decentralized Networks
February 8th, 2011 by wd5
Speaker: Zhi Tian, Michigan Technological University
Time: 3-5pm, Friday, 02/18/2011 Location: DH 1046
Abstract:
Sparsity that characterizes many natural and man-made signals has been exploited over the years in a broad range of statistical inference and signal representation applications, leading to the recent exciting results on compressed sensing for signal reconstruction at sub-Nyquist rates. This talk will discuss the application of compressive sensing for sparse event detection using energy-constrained wireless sensor networks. The physical phenomena under monitoring exhibit localized features that appear sparsely over a large sensing field, which motivate distributed compressive sensing. Meanwhile, for network scalability and robustness, decentralized information processing is considered, in which no fusion center is employed to centrally process all the sensory data. To solve such a sparsity-cognizant cooperative sensing problem in a decentralized manner, we will utilize iterative consensus optimization to search for the globally optimal solutions, under the constraint that sensors transmit at low power and can communicate with their one-hop neighbors only. We will provide several design options, which entail different tradeoffs in communication costs, convergence speed, and sensor awareness level. Further, we will discuss a related cooperative support detection problem, in which sensors seek to consent on the locations of the nonzero elements, but not the amplitudes. A couple of applications will be highlighted, including cooperative spectrum sensing in cognitive radio networks and damage detection in structural health monitoring.
Biography:
Zhi (Gerry) Tian is an Associate Professor at the department of Electrical and Computer Engineering, Michigan Tech University. Her general interest lies in signal processing for communications. Current research focuses on cognitive radio networks and distributed wireless sensor networking. She served as Associate Editor for IEEE Transactions on Wireless Communications and IEEE Transaction on Signal Processing. She received a CAREER award from the US National Science Foundation in 2003.