Maximum-likelihood decoding and performance analysis of a noisy channel network with network coding
2007 (English)In: 2007 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, 2007, 6103-6110 p.Conference paper (Refereed)
We investigate sink decoding methods and performance analysis approaches for a network with intermediate node encoding (coded network). The network consists of statistically independent noisy channels. The sink bit error probability (BEP) is the performance measure. We first discuss soft-decision decoding without statistical information on the upstream channels (the channels not directly connected to the sink). The example shows that the decoder cannot significantly improve the BEP from the hard-decision decoder. We develop the union bound to analyze the decoding approach. The bound can show the asymptotic (regarding SNR: signal-to-noise ratio) performance. Using statistical information of the upstream channels, we then show the method of maximum-likelihood (ML) decoding. With the decoder, a significant improvement in the BEP is obtained. To evaluate the union bound for the ML decoder, we use an equivalent signal point procedure. It can be reduced to a leastsquares problem with linear constraints for medium-to-high SNR.
Place, publisher, year, edition, pages
2007. 6103-6110 p.
, IEEE International Conference on Communications, ISSN 1550-3607
IdentifiersURN: urn:nbn:se:kth:diva-28966ISI: 000257882504071OAI: oai:DiVA.org:kth-28966DiVA: diva2:398524
IEEE International Conference on Communications (ICC 2007) Glasgow, SCOTLAND, JUN 24-28, 2007
QC 201102182011-02-182011-01-252011-02-18Bibliographically approved