Mutual Information Approximation Based Polar Code Design for 4Tb/in2 2D-ISI Channels. - Kong, Lingjun; Liu, Haiyang; Tian, Jin; Zhang, Shunwai; Zhao, Shengmei; Fang, Yi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)