Quasi-Cyclic LDPC Codes using Superposition Matrices and Their Layered Decoders for Wibro Systems 


Vol. 35,  No. 2, pp. 325-333, Feb.  2010


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  Abstract

Most communication systems including Wibro use quasi-cyclic LDPC codes composed of circulants. However, it is very difficult to design quasi-cyclic(QC) LDPC codes with optimal degree distribution satisfying conditions on layered decoding and girth due to the restriction of the size of its base matrix. In this paper, we propose a good solution by introducing superposition matrices to QC LDPC codes. We derive the conditions on checking girth of QC LDPC codes with superposition matrices, and propose new decoder to support layered decoding both for original QC LDPC codes and their modifications with superposition matrices. Simulation results show considerable improvements to convergence speed and error-correcting performance of proposed scheme which adopts QC LDPC codes with superposition matrices.

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  Cite this article

[IEEE Style]

B. Shin, H. Park, S. Kim, J. No, "Quasi-Cyclic LDPC Codes using Superposition Matrices and Their Layered Decoders for Wibro Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 2, pp. 325-333, 2010. DOI: .

[ACM Style]

Beomkyu Shin, Hosung Park, Sang-Hyo Kim, and Jong-Seon No. 2010. Quasi-Cyclic LDPC Codes using Superposition Matrices and Their Layered Decoders for Wibro Systems. The Journal of Korean Institute of Communications and Information Sciences, 35, 2, (2010), 325-333. DOI: .

[KICS Style]

Beomkyu Shin, Hosung Park, Sang-Hyo Kim, Jong-Seon No, "Quasi-Cyclic LDPC Codes using Superposition Matrices and Their Layered Decoders for Wibro Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 35, no. 2, pp. 325-333, 2. 2010.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880