# Welcome

A graph, or network, is a structure that encodes pairwise relationships and a graph signal is a function defined on the nodes of the graph. The values of the weights on the edges of the graph encode an expectation on the relationship between the respective signal components. A large weight indicates that we expect the signal elements to be similar and a small weight indicates no such expectation except for what is implied by their common proximity to other nodes. The goal of graph signal processing (GSP) is to generalize the classical signal processing toolbox to graph signals.

Graph signal processing applications arise whenever we encounter one of the many signals that are supported on a graph. Examples of applications that will be showcased in the workshop include gene expression patterns defined on top of gene networks, the spread of epidemics over a social network, the congestion level at the nodes of a telecommunication network, and patterns of brain activity defined on top of a brain network.

Besides particular applications, the workshop will also showcase the advancement of the understanding of network data by redesigning traditional tools originally conceived to study signals defined on regular domains (such as time-varying signals or spatially varying images and fields) and extending them to analyze signals on the more complex graph domain. Examples of topics to be showcased in this theoretical track include graph transforms, sampling theorems, and filter design.

The Graph Signal Processing Workshop will be held on the campus of the **University of Pennsylvania,** **May 25-27 of 2016.** With hopes of seeing the Spring in full swing, the conference will emphasize the blooming theory of graph signal processing and the emergence of applications in various fields.

# Sponsors

The workshop is supported by the Warren Center for Network and Data Sciences, the National Science Foundations and the School of Engineering and Applied Science of the University of Pennsylvania.

# News

We are now accepting abstract submissions. on a rolling admission basis. If you submit an abstract for consideration, we will respond within the week. We have currently 45 papers accepted for presentation. Please refer to the call for papers for a partial list of topics of interest.