study

在工程应用中 经常会遇到一些复杂的非线性系统, 这些系统状态方程复杂, 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。 该方法把未 知 系 统看成是一个黑箱, 首先用 系 统 输入输出 数据 训 练 BP 神 经网 络, 使网 络能 够表达该未 知 函 数, 然后就可以 用训练好的 BP 神经网络预测系统输出 。 本章拟合的非线性函 数为 y = x1^2+x2^2. 。 (In engineering applications often encounter some complex nonlinear systems, which complicated the equation of state, can not be accurately modeled mathematically. In this case, BP neural network can be established to express these nonlinear systems. The method of the unknown system as a black box, the first input and output data with systematic training BP neural network, the network can express the unknown function, then you can use the trained BP neural network forecasting system output. Chapter for fitting non-linear function y = x1 ^ 2+x2 ^ 2..)

相参脉冲串复调制信号，包括随机梯度算法，相对梯度算法，ldpc码的编解码实现。( Complex modulation coherent pulse train signal, Including stochastic gradient algorithm, the relative gradient algorithm, Codec ldpc code implementatio.)

说明：  《MATLAB实用教程》用到的部分程序，比较全的。(&quot MATLAB Practical Guide&quot Part of the procedure used to compare the sound.)

提取原始信号的功率谱就可以看出在哪个频带的能量比较高，噪声主要集中在哪里，这样就可以专门分析那个频带的噪声(The power extracted the spectrum of the original signal can be seen in which frequency band energy is high, the noise is mainly concentrated in where, so that it can be devoted to the analysis of the frequency band of noise)

DTFT plot the spectrum of a sinusoidal signal

主要完成CRC的编解码 16bit 可用于多种运算 可用于实际的仿真系统(CRC completed the main 16bit codec can be used for a variety of computing can be used for the actual simulation system)

产生一个正交相位调制信号（QPSK），该信号可供复数解析，调制相位为（0，pi/2,pi,3*pi/2）(have an orthogonal signal phase modulation (QPSK), which is available for complex signal analysis, Phase modulation (0, pi/2, pi, pi* 3/2))

solar mppt comparision mehtods different types of mppts

THIS IS ABOUT LEARNING MATLAB FOR ENGNEERING STUDENT WITH PERSIAN LANGUAGE.

一个用matlab做的电话声学回声消除程序(Using matlab to do a telephone acoustic echo cancellation procedures)