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Summary: Low-Complexity Cooperative Coding for Sensor
Networks using Rateless and LDGM Codes
Andrew W. Eckford, Josephine P. K. Chu, and Raviraj S. Adve
Dept. of Electrical and Computer Engineering, University of Toronto
10 King's College Road, Toronto, Ontario, Canada M5S 3G4
E-mail: andrew.eckford@utoronto.ca, {chuj,rsadve}@comm.utoronto.ca
Abstract-- Given limitations with current technology, nodes
in a sensor network have stringent energy and complexity
constraints. This paper presents a scheme for cooperative error-
control coding, using rateless and low-density generator-matrix
codes, for sensor networks. Assuming knowledge of the source-
relay channel quality, we use density evolution to show that the
proposed scheme achieves good performance and a good energy
tradeoff despite low computational complexity. The scheme
exploits the flexibility of rateless codes to permit, depending on
the channel conditions, independent, relay and cooperative modes
of operation. As a motivating example, we analyze networks of
two cooperating nodes communicating with a more sophisticated
receiver. We also discuss the generalization of our framework to
a multi-node system.
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