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:
Jan. 14, 2003
Filed:
Sep. 07, 1999
Ronald D. McCallister, Scottsdale, AZ (US);
Bruce A. Cochran, Mesa, AZ (US);
SICOM, Inc., Scottsdale, AZ (US);
Abstract
A digital communication transmitter ( ) implements a phase constellation ( ) which defines a digital communication signal stream that is subsequently compressed ( ), thereby introducing distortion into a communication signal ( ) transmitted to a complementary receiver ( ). The receiver ( ) includes a magnitude adjuster ( ) which increases the magnitude component of selected phase estimates to at least partially compensate for the compression distortion. The receiver also includes a branch metrics generator ( ) having a segment ( ) in which branch metric transfer function peaks and valleys are not positioned in receiver phase space to coincide with ideal phase points. The branch metric transfer functions are generated in accordance with a process ( ) which bases branch metric calculations upon empirically determined probabilities that characterize system-induced distortions.