copon

在信号处理中，信号发射时，信号通过载波，调制，以电磁波的形式发射出来 在接收端，射频信号通过天线接收，超外差式等方式进行处理，变频到中频 然后通过数字技术对中频信号进行处理，此时的中频信号采样率很高，多达几十兆赫 而要解调出来的信号很小，此时就要经过滤波来得到我们需要的信号 如果直接设计滤波器，阶数会非常庞大，软件，硬件设备都承受不了 因此，一般常用的技术是进行下变频处理，其主要技术就是通过抽取滤波进行下变频 常用的滤波器就是CIC抽取, 希望可以帮助一些坛友解决基本的问题。 (In signal processing, signal emission, signal through the carrier, in the form of electromagnetic wave modulation, launched In the receiver, rf signals through the antenna, specialized superheterodyne type means such as processing, the frequency conversion to intermediate frequency Then through digital technology of intermediate frequency signal processing, at this time of intermediate frequency signal sampling rate is very high, as many as several decades MHZ But the signal demodulation out is very small, at this time would be passing filter to get what we need signal If design directly filter, order number be colossal, software, hardware equipment all suffer Therefore, the technology is usually used for down-transducer processing, its main technical is by extracting filtering down-transducer Commonly used filter is CIC extraction, the hope can help some friends solve basic problems of the altar.)

说明：  用matlab实现的GSM TCH/EFS系统在高斯信道、瑞利信道下的性能仿真，其中用到了循环编码、卷积码、交织码等信道编码技术(Using matlab to achieve GSM TCH/EFS system in the Gaussian channel, Rayleigh channel the performance of simulation, which uses a loop encoding, convolutional codes, interleaving codes channel coding techniques)

Rational-Dilation Wavelet Transforms (RADWT)

一个介绍matlab的课件，介绍模型的，相信对大家都有用处的，很好的课件。(An introduction matlab courseware to introduce the model, I believe we have a useful, good courseware.)

一个有关人脸识别的程序，是PCA和SVM的，可以运行(a code about face recognition)

该模型是模拟信号数字传输系统，可以把一个模拟信号通过PCM编码译码，信道2FSK编码译码，再通过一个二进制对称信道，可以恢复出原模拟信号(The model is the analog signal digital transmission system, an analog signal by the PCM codec, channel 2FSK codec, and then through a binary symmetric channel, you can restore the original analog signal)

语音信号去噪，通过短时傅里叶变换、维纳滤波(Speech Signal Denoising via short-time Fourier transform, Wiener filter)

近红外光谱与PLS方法用于药片中有效成分含量的测定 MATLAB(Determination of the content of effective components in tablets by near infrared spectroscopy and PLS)

说明：  堆栈的应用，堆栈的存储结构已及常用的基本操作(The application stack, stack, and used storage structure has been the basic operation of)

QAM_MODEM matlab代码(QAM_MODEM Matlab code)