A new construction method of LDPC codes for optical transmission systems

Abstract

Based on the construction method of systematically constructed Gallager (SCG)(4, k) code, a new improved construction method of low density parity check (LDPC) code is proposed. Compared with the construction method of SCG(4, k) codes improved before, the proposed construction method has some advantages, such as saving storage space and reducing computation complexity in the hardware implementation. And then LDPC(5929, 5624) code with 5.42% redundancy is constructed by the proposed method. The simulation results and analysis show that the constructed LDPC(5929, 5624) code has better error-correction performance, lower redundancy and lower decoding complexity than those of a classic Reed-Solomon (RS)(255, 239) code. Therefore, LDPC(5929, 5624) code, constructed by the proposed construction method on LDPC codes, can better suitable for optical transmission systems.

Keywords

low density parity check (LDPC) codes / net coding gain (NCG) / construction method / optical transmission systems

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 61071117 and 61003256), the Natural Science Foundation of CQ CSTC (No. 2010BB2409) and the Science and Technology Foundation of Chongqing Municipal Education Commission (No. KJ110519).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg