Practical source-network decoding
Name
Maierbacher-2009-Practical source-network decoding.pdf
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167.99 KB
Format
Adobe PDF
Checksum (MD5)
82baffea249a5fc39b368b70e659b707
Author(s)
Maierbacher, Gerhard
Barros, Joao
Medard, Muriel
Date Issued
October 2009
Journal
6th International Symposium on Wireless Communication Systems, 2009. ISWCS 2009
Publisher
Institute of Electrical and Electronics Engineers
Citation
Maierbacher, G., J. Barros, and M. Medard. “Practical source-network decoding.” Wireless Communication Systems, 2009. ISWCS 2009. 6th International Symposium on. 2009. 283-287. © 2009 IEEE.
Version
Final published version
Abstract
When correlated sources are to be communicated over a network to more than one sink, joint source-network coding is, in general, required for information theoretically optimal transmission. Whereas on the encoder side simple randomized schemes based on linear codes suffice, the decoder is required to perform joint source-network decoding which is computationally expensive. Focusing on maximum a-posteriori decoders (or, in the case of continuous sources, conditional mean estimators), we show how to exploit (structural) knowledge about the network topology as well as the source correlations giving rise to an efficient decoder implementation (in some cases even with linear dependency on the number of nodes). In particular, we show how to statistically represent the overall system (including the packets) by a factor-graph on which the sum-product algorithm can be run. A proof-of-concept is provided in the form of a working decoder for the case of three sources and two sinks.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Laboratory for Information and Decision Systems
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1109/ISWCS.2009.5285249
