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:
Apr. 09, 2002
Filed:
Oct. 27, 1998
Ayyoob D. Abbaszadeh, Salt Lake City, UT (US);
Robert John Currie, Salt Lake City, UT (US);
L-3 Communications Corp., Salt Lake City, UT (US);
Abstract
A method of branch metric calculation of trellis coded data, suitable for a decoder of phase angle on a carrier modulated with phase shift keying (PSK) modulation, begins with an expressing angles of phase shift by a vectorial representation of sectors within quadrants of a circle. The sectors are subdivided into sub-sectors of differing sizes, and the sub-sectors are divided further into equal increments of angle referred to as PIEs. The PIEs and the quadrants are identified and, in each quadrant, there is an assigning of a set of branch metrics to serve as identifiers of respective ones of the sub-sectors in each sector of the quadrant. The set of branch metrics in one sector of the quadrant differs from the set of branch metrics in another of the sectors of the quadrant by a permutation of the branch metrics. The phase data is outputted in the form of branch metrics and quadrant for use by a decoder such as a Viterbi decoder.