Fixed-point turbo decoder implementation suitable for embedded applications

Author

Castellon, Marco A. ; Fair, Ivan J. ; Elliott, Duncan G.

Author_Institution

Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta.

fYear

2005

fDate

1-4 May 2005

Firstpage

1065

Lastpage

1068

Abstract

Real-time decoders for turbo codes used in practical applications such as in the WCDMA (UMTS) 3GPP cellular standard are likely to be implemented using fixed-point arithmetic. Requirements for efficient turbo decoders include low-complexity algorithms and small word sizes. The implementation of such a decoder using a modified constant-Log-MAP decoding algorithm is described here. Simulation results demonstrate that the architectural decisions affecting this design lead to a BER performance that is within 0.1 dB of the performance of the baseline floating-point log-MAP algorithm. The low hardware cost offered by fixed-point turbo decoders make them suitable for use in embedded applications

Keywords

3G mobile communication; broadband networks; cellular radio; code division multiple access; error statistics; fixed point arithmetic; maximum likelihood decoding; turbo codes; 3GPP cellular standard; BER; UMTS; WCDMA; embedded applications; fixed-point arithmetic; fixed-point turbo decoder implementation; floating-point log-MAP algorithm; modified constant-Log-MAP decoding algorithm; 3G mobile communication; Algorithm design and analysis; Bit error rate; Code standards; Costs; Decoding; Fixed-point arithmetic; Hardware; Multiaccess communication; Turbo codes;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2005. Canadian Conference on

Conference_Location

Saskatoon, Sask.

ISSN

0840-7789

Print_ISBN

0-7803-8885-2

Type

conf

DOI

10.1109/CCECE.2005.1557160

Filename

1557160