Scheduling for an Adaptive Number of Iterations in Turbo Equalizers Combined with LDPC Decoders

Author

Lee, Myung-Kyu ; Yang, Kyeongcheol

Author_Institution

Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol. (POSTECH), Pohang, South Korea

Volume

58

Issue

10

fYear

2010

fDate

10/1/2010 12:00:00 AM

Firstpage

2759

Lastpage

2764

Abstract

A new scheduling to reduce the complexity of a turbo equalizer (TE) combined with a low-density parity-check (LDPC) decoder is proposed. Simple metrics and criteria for the proposed scheduling are derived from its convergence behavior. The TE with the proposed scheduling monitors the status of its iterative process and determines whether additional equalization is needed or not. Based on the decision, it adjusts performing equalization and reduces the execution number of equalization. Consequently, this leads to lowering the overall complexity of the TE. Numerical results show that the proposed scheduling has lower complexity than conventional schedulings, while they have almost the same performance.

Keywords

iterative methods; parity check codes; scheduling; turbo codes; convergence behavior; iteration scheduling; low-density parity-check decoder; scheduling complexity; turbo equalizers; Complexity theory; Convergence; Decoding; Equalizers; Iterative decoding; Scheduling; Turbo equalizer (TE); extrinsic information transfer (EXIT) chart; intersymbol interference (ISI) channel; low-density parity-check (LDPC) codes;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2010.082710.090533

Filename

5567014