非归零型差分相位调制信号建模与仿真分析 ，利用最小二乘算法实现对三维平面的拟合，内含心电信号数据及运用MATLAB写的源代码。- NRZ type differential phase modulation signal modeling and simulation analysis, Least-squares algorithm to fit a three-dimensional plane, ECG data and includes source code written in MATLAB.