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:
Jun. 03, 1997
Filed:
Jan. 29, 1996
Richard W Citta, Oak Park, IL (US);
David A Willming, Palatine, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A data receiver comprises a demodulator for recovering a received data signal comprising a stream of interleaved regularly spaced one-dimensional symbols of a phase invariant symbol constellation, each of the received symbols representing 3 bits, Z.sub.0, Z.sub.1, Z.sub.2 produced by convolutionally coding a first data bit X.sub.1 to derive bits Z.sub.0, Z.sub.1 and precoding a second data bit X.sub.2 to derive bit Z.sub.2. The received symbols are applied to a first decoder for estimating data bit X.sub.1 and a bit Y.sub.2, Y.sub.2 being applied to a postcoder for conversion to an estimate of data bit X.sub.2. The first decoder may comprise a Viterbi decoder or a 4-level slicer. In a preferred embodiment of the invention the received signal includes a plurality of regularly spaced synchronization intervals, each comprising a number of received symbols, and the second decoder is prevented from changing state during the synchronization intervals.