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:
Jul. 05, 1994
Filed:
Dec. 15, 1992
Katsuhiko Kawazoe, Yokohama, JP;
Shunji Honda, Yokosuka, JP;
Shuji Kubota, Yokosuka, JP;
Shuzo Kato, Yokohama, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
In a simple decoder which decodes convolutional codes of constraint length K and coding rate n/m, encoded data which is supplied thereto in steps of m bits are distributed, bit by bit, to m shift registers each having x=[(K-1)/(m-n)] series-connected shift stages. Here, [p] means the minimum integer equal to or larger than a real number p. The connection of n modulo-2 addition circuits to all the shift stages of all the shift registers is defined by n decoding generative vectors which define n decoding generative polynomials. The modulo-2 addition circuits perform modulo-2 additions of the outputs of the shift stages connected thereto and output n results of additions as decoded results of n bits. The n decoding generative vectors are selected from decoding generative vectors of N rows which are obtained as an inverse matrix of a square matrix whose elements are N.times.N coefficients which define N=mx convolutional code generating polynomials.