Sphere Packing Optimization and EXIT Chart Analysis for Multi-Dimensional QAM Signaling

Author

Koike-Akino, Toshiaki ; Tarokh, Vahid

Author_Institution

Sch. of Eng. & Appl. Sci., Harvard Univ., Cambridge, MA, USA

fYear

2009

fDate

14-18 June 2009

Firstpage

1

Lastpage

5

Abstract

We investigate on multi-dimensional QAM constellations optimized by sphere packing with the known densest lattices. We propose a greedy design method assisted by the sphere detection. It is demonstrated that the optimized constellations can significantly increase the squared minimum distance in comparison to the conventional QAM constellations. In addition, we analyze the optimized QAMs through the use of an extrinsic information transfer (EXIT) chart for iterative decoding.

Keywords

iterative decoding; multidimensional signal processing; optimisation; quadrature amplitude modulation; EXIT chart analysis; extrinsic information transfer; iterative decoding; multidimensional QAM signaling; optimized constellations; sphere detection; sphere packing optimization; squared minimum distance; Communications Society; Constellation diagram; Design methodology; Energy efficiency; Information analysis; Iterative decoding; Lattices; Quadrature amplitude modulation; Signal analysis; Signal design;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2009. ICC '09. IEEE International Conference on

Conference_Location

Dresden

ISSN

1938-1883

Print_ISBN

978-1-4244-3435-0

Electronic_ISBN

1938-1883

Type

conf

DOI

10.1109/ICC.2009.5199484

Filename

5199484