Performance Evaluation of A Modified Sum-Product Decoding Algorithm for LDPC Codes

Author

Papaharalabos, Stylianos ; Sweeney, Peter ; Evans, Barry G. ; Albertazzi, Gianni ; Vanelli-Coralli, Alessandro ; Corazza, Giovanni E.

Author_Institution

Dept. of Electron. Eng., Surrey Univ., Guildford

fYear

2005

fDate

7-7 Sept. 2005

Firstpage

800

Lastpage

804

Abstract

We propose a modified hyperbolic tangent (tanh) function that is used in the sum-product algorithm (SPA). This is done in order to approximate the infinite argument of the tanh function, when decoding low-density parity-check (LDPC) codes. As shown by computer simulation results, the proposed modification has a significant impact on the error floor reduction of the code and to the coding gain improvement with respect to the SPA with no modification. Computer simulation results with approximations using both piecewise linear function and coarse quantization are also presented

Keywords

decoding; parity check codes; piecewise linear techniques; product codes; LDPC codes; coarse quantization; low-density parity-check codes; modified hyperbolic tangent; modified sum-product decoding algorithm; piecewise linear function; AWGN; Computer simulation; Digital video broadcasting; Iterative decoding; Parity check codes; Piecewise linear approximation; Piecewise linear techniques; Quantization; Satellite broadcasting; Sum product algorithm; iterative decoding; low-density parity-check codes; sum-product algorithm;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communication Systems, 2005. 2nd International Symposium on

Conference_Location

Siena

Print_ISBN

0-7803-9206-X

Type

conf

DOI

10.1109/ISWCS.2005.1547819

Filename

1547819