Lazaro, FranciscoFranciscoLazaroPaolini, EnricoEnricoPaoliniLiva, GianluigiGianluigiLivaBauch, GerhardGerhardBauch2019-09-042019-09-042015-06IEEE International Symposium on Information Theory, (ISIT 2015)http://hdl.handle.net/11420/3287In this paper Raptor code ensembles with linear random precodes in a fixed-rate setting are considered. An expression for the average distance spectrum is derived and this expression is used to obtain the asymptotic exponent of the weight distribution. The asymptotic growth rate analysis is then exploited to develop a necessary and sufficient condition under which the fixed-rate Raptor code ensemble exhibits a strictly positive typical minimum distance.enTechnology::600: TechnologyConference Paper10.1109/ISIT.2015.7282983