random_reduce

demo bpsk used for modulation

“License-plate-recognition-01-modified-1.zip”使用Matlab，实现自动车牌分割、矫正、识别。(the code can abtain auto-segmentation,and auto-recognition of license plate.)

用于应用二维数组，生成地震记录剖面，对于地震模型的模拟数据快速生成剖面很有帮助。(A two-dimensional array for application and generates seismic records for seismic model section of analog data generated fast profile is very helpful. )

DFT进行频谱分析时的三种现象 1、混叠：对连续信号采样，要求连续信号是带限的，采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。 采样前加低通滤波器防混叠 2、频谱泄漏：DFT对时域信号进行了截断（相当于采样信号乘了一个窗函数），时域的乘积相当于频域卷积，改变了原信号频谱。 改用其他窗函数（非矩形）改善泄漏。 3、栅栏现象：DFT 只给出了频谱在采样点上的取值，采样点间的频谱内容丢失。(DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.)

This file is the programs of (chapter 4) of book (Modeling the Wireless Propagation Channel a Simulation Approach with MATLAB) which is related to introduction to multipath. It helps you to simulate multipath wireless channel.

运用蚁群算法求函数最值，采取蚁群迭代。根据函数求出最大值(Ant colony algorithm is used to find the function minimum)

matlab编制的牛顿拉夫逊法潮流分析，以及PQ、快速PQ法。采用IEEE30 节点算例(matlab prepared Newton Raphson load flow analysis, and the PQ, fast PQ method. IEEE30 bus test cases)

Cannot create induction motor dq model.rar

Matlab codes for Contemprary Communication systems using matlab

介绍了简单的ldpc编码，对初学者很有用！(Introduced a simple ldpc code is useful for beginners!)