Soft-Decision Metrics for Coded Orthogonal Signaling in Symmetric Alpha-Stable Noise
2008 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 56, no 1, 266-273 p.Article in journal (Refereed) Published
This paper derives new soft-decision metrics for coded orthogonal signaling in impulsive noise, more specifically symmetric-stable noise. For the case of a known channel amplitude and known noise dispersion, exact metrics are derived both for Cauchy and Gaussian noise. For the case that the channel amplitude or the dispersion is unknown, approximate metrics are obtained in closed-form based on a generalized-likelihood ratio approach. The performance of the new metrics is compared numerically for a turbo-coded system, and the sensitivity to side information of the optimum receiver for Cauchy noise is considered. The gain that can be achieved by using a properly chosen decoding metric is quantified, and it is shown that this gain is significant. The application of the results to frequency hopping ad hoc networks is also discussed.
Place, publisher, year, edition, pages
2008. Vol. 56, no 1, 266-273 p.
Cauchy, generalized likelihood ratio, impulsive noise, stable distribution
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-25569DOI: 10.1109/TSP.2007.906775OAI: oai:DiVA.org:liu-25569DiVA: diva2:245935
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Michael R. Souryal, Erik G. Larsson, Bojan Peric and Branimir R. Vojcic, Soft-Decision Metrics for Coded Orthogonal Signaling in Symmetric Alpha-Stable Noise, 2008, IEEE Transactions on Signal Processing, (56), 1, 266-273.