Very low variable-rate convolutional codes for unequal error protection in DS-CDMA systems

Author

Lientz, Andrew ; Villasenor, John

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

45

Issue

7

fYear

1997

fDate

7/1/1997 12:00:00 AM

Firstpage

753

Lastpage

755

Abstract

Convolutional codes based on Hadamard sequences can achieve both orthogonality and variable rate. In contrast with other convolutional coding techniques, these codes incur no processing gain penalty in direct-sequence code-division multiple-access (DS-CDMA) systems. We describe a class of such codes called “telescopic protection codes”. These codes enable variable-rate error protection in the manner of rate-compatible punctured-convolutional (RCPC) codes, but preserve the Hadamard orthogonality properties necessary to maintain processing gain that RCPC codes lack

Keywords

Gaussian channels; binary sequences; code division multiple access; convolutional codes; error correction codes; image coding; pseudonoise codes; spread spectrum communication; variable rate codes; AWGN channels; DS-CDMA systems; Hadamard orthogonality properties; Hadamard sequences; RCPC codes; compressed image transmission; convolutional coding; direct sequence code division multiple access; processing gain; rate compatible punctured convolutional codes; telescopic protection codes; unequal error protection; variable rate error protection; very low variable-rate convolutional codes; Autocorrelation; Bit error rate; Convolutional codes; Costs; Error correction; Error correction codes; Forward error correction; Multiaccess communication; Protection; Viterbi algorithm;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.602573

Filename

602573