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This work was supported in part by National Natural Science Foundation of China (Grant Nos. 61801527, 61701368, U1504601).
Appendixes A–C. The supporting information is available online at info.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.
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Xu, H., Li, H., Xu, M. et al. Two classes of QC-LDPC cycle codes approaching Gallager lower bound. Sci. China Inf. Sci. 62, 209305 (2019). https://doi.org/10.1007/s11432-018-9778-x