The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2002
Filed:
Apr. 27, 1999
Ronald D. McCallister, Mesa, AZ (US);
Bruce A. Cochran, Mesa, AZ (US);
Bradley Paul Badke, Chandler, AZ (US);
Sicom, Inc., Scottsdale, AZ (US);
Abstract
A digital communications system ( ) employs a rotationally invariant phase point constellation ( ″) in a modulator ( ) thereof and a corresponding carrier phase acquisition phase locked loop ( ) in a demodulator ( ) thereof. The phase point constellation ( ) is rotationally invariant and the demodulator ( ) is able to achieve carrier phase synchronization due at least in part to the inclusion of phase point voids ( ) positioned in the phase point constellation ( ″). Pragmatic encoding is employed with differential encoding ( ) only on non-convolutionally encoded bits. The phase point constellation ( ″) provides identical codes for convolutionally encoded bits ( ) of phase points ( ) having equal magnitude that are rotated 90°, 180° and 270° degrees from one another. Specific constellations of 256, 64 and 16 points are disclosed.