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:
May. 25, 1993
Filed:
Apr. 06, 1990
Applicant:
Inventors:
Vedat Eyuboglu, Boston, MA (US);
Michael P Chen, Boston, MA (US);
Assignee:
Codex Corporation, Mansfield, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375 34 ; 375 39 ; 371 43 ;
Abstract
A digital data sequence is mapped into a signal point sequence e(D) for data transmission over a channel h(D) to produce a channel output sequence y(D)=e(D)h(D). e(D) is chosen so that the signal points in the sequence y(D) belong to a class of possible sequences based on the digital data sequence, the class being based on a time-varying trellis code derived from an N-dimensional time-invariant trellis code by using different transformed versions of its underlying lattices for respectively different N-dimensional symbols.