Low-Complexity Coding and Source-Optimized Clustering for Large-Scale Sensor Networks

Details Low-Complexity Coding and Source-Optimized Clustering for Large-Scale Sensor Networks Low-Complexity Coding and Source-Optimized Clustering for Large-Scale Sensor Networks

2008-09-08

arxiv.org/abs/0809.1330v1

Computer Science

Information Theory

26 pages

Scientific paper

We consider the distributed source coding problem in which correlated data picked up by scattered sensors has to be encoded separately and transmitted to a common receiver, subject to a rate-distortion constraint. Although near-tooptimal solutions based on Turbo and LDPC codes exist for this problem, in most cases the proposed techniques do not scale to networks of hundreds of sensors. We present a scalable solution based on the following key elements: (a) distortion-optimized index assignments for low-complexity distributed quantization, (b) source-optimized hierarchical clustering based on the Kullback-Leibler distance and (c) sum-product decoding on specific factor graphs exploiting the correlation of the data.

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