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. 23, 2004
Filed:
Apr. 23, 2001
Karl R. Wittig, New York, NY (US);
Dagnachew Birru, Yorktown Heights, NY (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
For use in a receiver capable of decoding trellis encoded signals of the type comprising a trellis decoder and a decision feedback equalizer coupled to each path memory output of said trellis decoder, wherein said decision feedback equalizer is capable of obtaining symbol values from each path memory output of said trellis decoder for use as estimates in channel equalization, an apparatus and method is disclosed for reconstructing symbol values from trace back path information stored within said trellis decoder. The apparatus and method of the present invention reconstructs a symbol stream from the trellis decoder using data signal selection circuitry to obtain bit values that represent the reconstructed symbols. In one embodiment of the present invention, each of a plurality of multiplexers selects one of four symbol value inputs to send to a first adaptive filter tap cell in a set of twelve adaptive filter tap cells. The four symbol values represent (1) a symbol at trellis point “t”, and (2) a symbol at trellis point “t−12”, and (3) a symbol having the value “plus five”, and (4) a symbol having the value “minus five.”