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《数字信号处理》（程佩青第３版）课后上机实验的程序(" Digital Signal Processing" (Cheng Peiqing version 3) experiment on the computer after school program)

说明：  QPSK卷积码程序,包含误码率曲线，星座图等程序(QPSK convolutional code procedures)

i dont know what there in it exactely but you ca check

pso算法在背包问题中的matlab程序。(pso algorithm in the knapsack problem in the matlab program.)

lt码的MATLAB实现,程序绝对正确，并且非常完善(lt code MATLAB implemention，program is absolutely correct and very well.)

数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控。(Transmission of digital signals into base band transmission and band-pass transmission, in practice, most of the channel with band-pass characteristics can not directly transmit base-band signal. In order to make the digital signal is transmitted with a communication channel, you must use the digital baseband signal to modulate the carrier to make the signal to match the characteristics of the channel. The digital baseband signal control with a carrier, the digital baseband signal conversion to digital bandpass signal is called digital modulation. Keying method is commonly used digital modulation, such as on the carrier' s amplitude, frequency and phase shift keying.)

这个程序基于matlab，用经典的算法用于求解方腔流问题(This program is based on MATLAB classic algorithm for solving the cavity flow problem)

超声波检伤中惠根斯原理的matlab实现(Hui ultrasonic Wiggins triage principles in matlab implementation)

使用MATLAB程序自动生成六边形拓扑结构(MATLAB program automatically generate hexagonal topology)

Plot historical stock data (m file)