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:
Nov. 30, 1999
Filed:
Aug. 15, 1997
Ronald D McCallister, Scottsdale, AZ (US);
Bruce A Cochran, Mesa, AZ (US);
John M Liebetreu, Scottsdale, AZ (US);
Sicom, Inc., Scottsdale, AZ (US);
Abstract
A communication system (10) includes a rotationally invariant pragmatic trellis coded modulator (18) and demodulator (34). The modulator (18) partitions information bits (20) into primary (42) and secondary (44) data streams. The secondary data stream (44) is convolutionally encoded (70) then fed to the LSB of a phase mapper (76). The phase mapper (76) is arranged so that all pairs of adjacent phase data are generated from pairs of opposing polarity LSB inputs. The primary data stream (42) is differentially encoded through a dual channel differential encoder (50). The demodulator (34) convolutionally decodes (90) the secondary stream, then re-encodes (96) secondary stream estimates. The re-encoded secondary stream estimates are used to remove (102) the secondary modulation from phase value estimates. Adjusted phase value estimates are phase demodulated (104) and differentially decoded using a dual channel differential decoder (106).