Symmetric spherical QAM constellation

Details Symmetric spherical QAM constellation Symmetric spherical QAM constellation

2006-02-07

2006-02-07

Le, Amanda T. (Department: 2634)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S298000, C332S103000

Reexamination Certificate

active

06996189

ABSTRACT:
A quadrature amplitude modulation implementation incorporating a symmetric spherical quadrature amplitude modulation constellation. The symmetric spherical quadrature amplitude constellation, as displayed in a multi-dimensional complex plane, is bounded by a surface comprising all symbol points at a predetermined distance from a center point and coincident with the intersection of at least two axes, and exhibiting correspondence in relative position of the symbol points on opposite sides of the at least two axes.

REFERENCES:
patent: 6614861 (2003-09-01), Terry et al.
patent: 2003/0076890 (2003-04-01), Hockwald et al.
patent: 2606233 (1988-05-01), None
patent: WO01/86903 (2001-11-01), None

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