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:
Mar. 09, 1993
Filed:
Mar. 07, 1990
Andrew J Viterbi, La Jolla, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
An encoder and decoder for generating and decoding convolutional codes of enhanced orthogonality. In an exemplary embodiment the encoder includes a K bit length shift register for receiving an input serial stream of information bits and providing for each input bit a K bit parallel output to an orthogonal code sequence generator where one of 2.sup.K-1 symbol sequences is generated with each symbol sequence of a K-2 symbol length. The encoded symbol stream is decoded using an orthogonal function generator driven by a K-2 binary counter to generate all possible symbol sequences for comparison with each received symbol sequence. The output of the comparison is Viterbi decoded to provide the original stream of information bits. Corresponding methods of encoding the information bits and decoding of the symbol sequences are included.