Khinchine.s theorem and Edgeworth approximations for weighted sums

Let Fn denote the distribution function of the normalized sum of n i.i.d. random variables. In this paper, polynomial rates of approximation of Fn by the corrected normal laws are considered in the model where the underlying distribution has a convolution structure. As a basic tool, the convergence part of Khinchine.s theorem in metric theory of Diophantine approximations is extended to the class of product characteristic functions.