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2010-01-19T08:58:39+01:00
2010-01-19T08:57:30+01:00
2010-01-19T08:58:39+01:00
Adobe Acrobat 8.1 Combine Files
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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
This paper derives new soft-decision metrics forcoded orthogonal signaling in impulsive noise, more specificallysymmetric -stable noise. For the case of a known channel amplitudeand known noise dispersion, exact metrics are derived bothfor Cauchy and Gaussian noise. For the case that the channelamplitude or the dispersion is unknown, approximate metricsare obtained in closed-form based on a generalized-likelihoodratio approach. The performance of the new metrics is comparednumerically for a turbo-coded system, and the sensitivity to sideinformation of the optimum receiver for Cauchy noise is considered.The gain that can be achieved by using a properly chosendecoding metric is quantified, and it is shown that this gain issignificant. The application of the results to frequency hopping adhoc networks is also discussed.
Cauchy
generalized likelihood ratio
impulsive noise
stable distribution
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Adobe Acrobat 8.1
Cauchy, generalized likelihood ratio, impulsive noise, stable distribution
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