Improved Log-MAP decoding algorithm for turbo-like codes

Author

Wang, Hao ; Yang, Hongwen ; Yang, Dacheng

Author_Institution

Sch. of Telecommun. Eng., Beijing Univ. of Posts & Telecommun., China

Volume

10

Issue

3

fYear

2006

fDate

3/1/2006 12:00:00 AM

Firstpage

186

Lastpage

188

Abstract

In this letter, a new method for decoding turbo-like codes is proposed to simplify the hardware implementation of Log-MAP algorithm. In our method, the multivariable Jacobian logarithm in Log-MAP algorithm is actually concatenated by recursive 1D Jacobian logarithm units. Two new approximations of Log-MAP algorithm based on these 1D units are then presented, which have good approximated accuracy and is simple for hardware implementation. We further suggest a novel decoding scheme that its complexity is near the Max-Log-MAP while the performance is close to the Log-MAP algorithm.

Keywords

approximation theory; concatenated codes; maximum likelihood decoding; turbo codes; Log-MAP decoding algorithm; approximation theory; concatenated code; hardware implementation; logarithmic maximum aposteriori algorithm; recursive 1D Jacobian logarithm unit; turbo-code; Concatenated codes; Error correction codes; Gaussian noise; Hardware; Iterative algorithms; Iterative decoding; Jacobian matrices; Performance loss; Telecommunication computing; Turbo codes;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2006.1603379

Filename

1603379