초록 ▼

A rate-l/n or rate-k/n convolutional encoding method, in a digital communications system having a non-systematic convolutional encoder, includes the steps of: obtaining first to n-th block code words by multiplying first to n convolutional code generating polynomials by an information polynomial upo

A rate-l/n or rate-k/n convolutional encoding method, in a digital communications system having a non-systematic convolutional encoder, includes the steps of: obtaining first to n-th block code words by multiplying first to n convolutional code generating polynomials by an information polynomial upon input of an information word; converting one of the first to n-th block code words to a systematic code word and obtaining a new information word corresponding to the systematic code word; and generating a convolutional code by encoding the new information code in the non-systematic convolutional encoder.

대표청구항 ▼

[ What is claimed is:] [1.] 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; andgen

[ What is claimed is:] [1.] 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; andgenerating 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 EQU C.sub.2 (x)=r.sub.2 (x)+x.sup.m I(x) EQU =I.sub.n (x)g.sub.2 (x) EQU =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.