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OFDM —— OFDM(Orthogonal Frequency Division Multiplexing)即正交频分复用技术仿真。(OFDM- OFDM (Orthogonal Frequency Division Multiplexing) that is orthogonal frequency division multiplexing simulation.)

说明：  BP算法是为了解决多层前向神经网络的权系数优化而提出来的；所以，BP算法也通常暗示着神经网络的拓扑结构是一种无反馈的多层前向网络(BP algorithm is to solve the multi-layer feedforward neural network weights optimization and put forward Therefore, BP algorithm usually implies that the topology of neural network is a multi-layer feedback-free network)

数值模拟三能级原子系统的稳态EIT现象，能修改各项参数对吸收项，相干项，粒子数布局的影响(Numerical simulation of steady-state EIT phenomena in a three-level system)

在bmp图像中隐藏另一图像，希望对大家有用！(bmp image in another hidden images, useful for all!)

The problem-solving process for a computational problem can be outlined as follows: 1. Define the problem. 2. Create a mathematical model. 3. Develop a computational method for solving the problem. 4. Implement the computational method. 5. Test and assess the solution.

说明：  《现代通信系统（mmatlab版）第二版》所有源代码(C ontemporary Communication Systems Using Matlab)

FDM modulation with matlab

This module will calculate the electrical angle between two different signals (Normally current + Voltage). once the first siganl as a reference signal and once the second signal as a reference signal.

说明：  matlab图形化一个矩阵，并对矩阵进行重新排序(matlab a graphical matrix, and reorder the matrix)

Sampling theorem. Natural Sampling.