Title :
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
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;
Conference_Titel :
Communications, 2009. ICC '09. IEEE International Conference on
Conference_Location :
Dresden
Print_ISBN :
978-1-4244-3435-0
Electronic_ISBN :
1938-1883
DOI :
10.1109/ICC.2009.5199484
