Abstract—This paper deals with a masking matrix design method of algebraically constructed quasi-cyclic (QC) LDPC codes for high-speed optical communications. The structure of masking matrix of QC-LDPC codes influences not only code rate, but also cycle and trapping sets distributions, so that it decides the code performance to a great extent, especially in error floor region. With the proposed method, masking matrix is carefully designed to have dual-diagonal and cyclic-shift structure, so as to improve implementation complexity. At the same time, the code rate can be flexibly adjusted and low storage memory is required. Simulation results show that the designed codes with high rate have excellent performance and error floor does not appear until bit error rate 10 -8 .
Index Terms—High-speed, masking matrix, optical communications, quasi-cyclic LDPC codes.
The authors are with State Key Lab of ISN, Xidian University, Xi’an, Shannxi, P. R. China (e-mail: email@example.com, firstname.lastname@example.org).
Cite: Shuling Che and Xinmei Wang, "Masking Matrix Design of Quasi-Cyclic LDPC Codes for High-speed Optical Communications," International Journal of Future Computer and Communication vol. 2, no. 4 pp. 296-298, 2013.