Universal Collaboration Strategies for Signal Detection: A Sparse   Learning Approach
  This paper considers the problem of high dimensional signal detection in a large distributed network whose nodes can collaborate with their one-hop neighboring nodes (spatial collaboration). We assume that only a small subset of nodes communicate with the Fusion Center (FC). We design optimal collaboration strategies which are universal for a class of deterministic signals. By establishing the equivalence between the collaboration strategy design problem and sparse PCA, we solve the problem efficiently and evaluate the impact of collaboration on detection performance. 
Prashant Khanduri, Bhavya Kailkhura, Jayaraman J. Thiagarajan, Pramod   K. Varshney
cs.LG stat.ML