Real-valued lattices and complex-valued lattices are mutually convertible,
thus we can take advantages of algebraic integers to defined good lattice
quantizers in the real-valued domain. In this paper, we adopt complex integers
to define generalized checkerboard lattices, especially Emβ and
Em+β defined by Eisenstein integers. Using Em+β,
we report the best lattice quantizers in dimensions 14, 18, 20, and 22.
Their product lattices with integers Z also yield better quantizers
in dimensions 15, 19, 21, and 23. The Conway-Sloane type fast decoding
algorithms for Emβ and Em+β are given.Comment: 7 page