butterworth-bandpass

移动通信系统中的通信信号调制的MATLAB仿真，包括BPSKQPSK等调制方法(Mobile communication systems Communications of the MATLAB simulation of signal modulation, including BPSK QPSK modulation method, etc.)

说明：  基于小波包的带通滤波器设计程序。给出了小波变换的快速算法和重构算法，讨论了应用小波变换进行信号带通滤波的方法，并通过正交小波包对信号的分解，把频率成分复杂的信号分解到各个频带上，根据需要提取指定频率的信号，然后用小波包重构算法对信号进行重构，实现对信号的提取。(Based on wavelet packet band-pass filter design program. Given the fast algorithm of wavelet transform and reconstruction algorithms are discussed using wavelet transform signal band-pass filtering method, and through the wavelet packet to signals can be decomposed, 把 frequency components of complex signal is decomposed into various frequency bands 上, according to need to extract the specified frequency signal, and then reconstructs the signal reconstruction algorithm to achieve the extraction of the signal.)

求信噪比的MATLAB源代码，用于通信系统学习(the matlab code for work out the SNR，for communication study)

计算机随机模拟日期才用泊松分布，利用指数分布求出时间(Before the date of the computer random simulation with Poisson distribution, calculated using exponential distribution of time)

本程序设计的是咬尾编码的turbo码，用matlab编写。咬尾turbo码也即不需要拖尾比特，使得前后两个状态相同，译码采用修正的MAP译码算法(This program is designed to encode the turbo tail biting code, written with matlab. Tail biting turbo code that is not trailing bits to make the same before and after the two states, decoding, MAP decoding algorithm using modified)

数学建模中常用的优化算法程序，经整理，有注释(Commonly used mathematical modeling optimization procedures have been collated, annotated)

Algorithms for the extraction of the extrema of a signal

matlab demo code .. .. .. ..

ofdm仿真系统matlab源程序，子载波调制方式为qam。(ofdm matlab simulation system source code, sub-carrier modulation for qam.)

应用于永磁同步电机的降阶扩展卡尔曼滤波matlab算法程序，PMSM(Reduced-order extended Kalman filtering procedures, PMSM)