通过matlab代码，非归零型差分相位调制信号建模与仿真分析 ，数学方法是部分子空间法。- By matlab code, NRZ type differential phase modulation signal modeling and simulation analysis, Mathematics is part of the subspace.

该代码为基于BP神经网络的预测算法。对于复杂的非线性系统，难以用数学方法准确建模，在这种情况下，可以建立BP神经网络表达这些非线性系统。(The code is a prediction algorithm based on BP neural network. It is difficult for complex nonlinear systems to be modeled accurately by mathematical methods. In this case, BP neura