New paper accepted

A new paper from the group has been accepted for publication

The paper “A Derivation of the Source-Channel Error Exponent Using Non-Identical Product Distributions” by A. Tauste Campo, G. Vazquez-Vilar, A. Guillén i Fàbregas, T. Koch, and A. Martinez has been accepted for publication by the IEEE Transactions on Information Theory; see http://arxiv.org/abs/1303.6249 for a prepint.
This paper studies the random-coding exponent of joint source-channel coding for a scheme where source messages are assigned to disjoint subsets (referred to as classes), and codewords are independently generated according to a distribution that depends on the class index of the source message. For discrete memoryless systems, two optimally chosen classes and product distributions are found to be sufficient to attain the sphere-packing exponent in those cases where it is tight.