A Zador-like formula for quantizers based on periodic tilings

We consider Zador's asymptotic formula for the distortion-rate function for a variable-rate vector quantizer in the high-rate case. This formula involves the differential entropy of the source, the rate of the quantizer in bits per sample, and a coefficient G which depends on the geometry of the quantizer but is independent of the source. We give an explicit formula for G in the case when the quantizing regions form a periodic tiling of n-dimensional space, in terms of the volumes and second moments of the Voronoi cells. As an application we show, extending earlier work of Kashyap and Neuhoff, that even a variable-rate three-dimensional quantizer based on the "A15" structure is still inferior to a quantizer based on the body-centered cubic lattice. We also determine the smallest covering radius of such a structure.

• Type: Journal
• Year: 2002
• Where: TIT
• Authors: N. J. A. Sloane, Vinay A. Vaishampayan
• Keywords: Asymptotic Formula, Quantizer, TIT 2002, Variable-rate Vector Quantizer