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In this article, the design of secure lattice coset codes for generalwireless channels with fading and Gaussian noise is studied. Recalling theeavesdropper's probability and information bounds, a variant of the latter isgiven from which it is explicitly seen that both quantities are upper boundedby (increasing functions of) the expected flatness factor of the faded latticerelated to the eavesdropper.  By making use of a recently developed approximation of the theta series of alattice, it is further shown how the average flatness factor can beapproximated numerically. In particular, based on the numerical computations,the average flatness factor not only bounds but also orders correctly theperformance of different lattices.

Information Bounds and Flatness Factor Approximation for Fading Wiretap MIMO Channels