Runlength violation of weakly constrained code

Author

Kunisa, Akiomi

Author_Institution

Hypermedia Res. Center, Sanyo Electr. Corp. Ltd, Tokyo, Japan

Volume

50

Issue

1

fYear

2002

fDate

1/1/2002 12:00:00 AM

Firstpage

1

Lastpage

6

Abstract

Guided scrambling (GS) is used to control the runlength within codewords as well as to suppress dc components. A weakly constrained code designed by using a GS technique violates the imposed κ-constraint with low probability, but achieves a code rate close to the channel capacity. In this study, the probability that codewords violate the k-constraint was measured by using convolutional GS and by using Galois-Field (GF)-addition GS. The occurrence probability of each runlength was also computed and then compared to a 24/25(0,8) block code having a high code rate and to the maxentropic runlength limited (RLL) sequence. The comparison shows that codes designed by these GS techniques attain extremely high code efficiency

Keywords

Galois fields; convolutional codes; runlength codes; GS; Galois-Field-addition GS; code rate; convolutional GS; dc components; guided scrambling; k-constraint; occurrence probability; runlength violation; weakly constrained code; Algorithm design and analysis; Block codes; Channel capacity; Communication system control; Communications Society; Convolution; Convolutional codes; Decoding; Digital recording; Probability;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.975729

Filename

975729