Patent ID: 6170076
Filing Date: 2001-01-02
Classification: H03M,H04L

Abstract:
A method of rate-1/2 convolutional encoding in a digital communications system, comprising the steps of: obtaining first and second block code words by multiplying an input information word by first and second convolutional code generating polynomials, respectively; and generating a convolutional code word by interleaving the first and second code words with an interleaving depth (.lambda.) of n; wherein the input information word exists in a systematic form in the second block code word C.sub.2 (x) expressed as C.sub.2 (x)=r.sub.2 (x)+x.sup.m I(x) =I.sub.n (x)g.sub.2 (x) =C.sub.s (x) where I(x) is the input word r.sub.2 (x) is a remainder after dividing x.sup.m I(x) by g.sub.2 (x), m is the number of shifters, I.sub.n (x) is an information word polynomial, g.sub.2 (x) is a code word generating polynomial for the second block code word, and C.sub.s (x) is a systematic code word.