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Network correlated data gathering with explicit communication: NP-completeness and algorithms

Published: 01 February 2006 Publication History

Abstract

We consider the problem of correlated data gathering by a network with a sink node and a tree-based communication structure, where the goal is to minimize the total transmission cost of transporting the information collected by the nodes, to the sink node. For source coding of correlated data, we consider a joint entropy-based coding model with explicit communication where coding is simple and the transmission structure optimization is difficult. We first formulate the optimization problem definition in the general case and then we study further a network setting where the entropy conditioning at nodes does not depend on the amount of side information, but only on its availability. We prove that even in this simple case, the optimization problem is NP-hard. We propose some efficient, scalable, and distributed heuristic approximation algorithms for solving this problem and show by numerical simulations that the total transmission cost can be significantly improved over direct transmission or the shortest path tree. We also present an approximation algorithm that provides a tree transmission structure with total cost within a constant factor from the optimal.

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Published In

cover image IEEE/ACM Transactions on Networking
IEEE/ACM Transactions on Networking  Volume 14, Issue 1
February 2006
231 pages

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IEEE Press

Publication History

Published: 01 February 2006
Published in TON Volume 14, Issue 1

Author Tags

  1. NP-completeness
  2. conditional coding
  3. correlated data gathering
  4. distributed algorithms
  5. routing tree
  6. sensor networks
  7. traveling salesman

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