... thesecurves. Firstly, randomly shifted codes perform better thansequentially shifted codes. The two seq-(2556, 2, 4) and ran-(2556, 2, 4) codes in the figure have sequential and ran-dom shifts, respectively, ... H. Fujita and K. Sakaniwa, “Some classes of quasi-cyclicLDPC codes: properties and efficient encoding method,” IE-ICE Transactions on Fundamentals of Electronics, Communi-cations and Computer ... Eleftheriou, and D. M. Arnold, “Regular and ir-regular progressive edge- growth tanner graphs,” IEEE Transac-tions on Information Theory, vol. 51, no. 1, pp. 386–398, 2005.[14] Y. Kou, S. Lin, and M....