已调制信号计算其普相关密度，利用最小二乘算法实现对三维平面的拟合，非归零型差分相位调制信号建模与仿真分析 。- Modulated signals to calculate its density Pu-related, Least-squares algorithm to fit a three-dimensional plane, NRZ type differential phase modulation signal modeling and simulation analysis.