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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.)

This code computes the distance and azimuth an earthquake to a station. It is necessary to provide the latitude and longitude bothe for the earthquake and the station.

安装好FEM后,FEM破解最后版本,呵呵 ,有的问题要注意下. (FEM installed after, FEM crack the final version, huh, huh, and some problems to the attention of the next.)

Matlab OFDM MIMO channel responses antennas

说明：   本程序为量子编码单目标优化程序，不同于以往量子态采用多位qubit编码，本程序采用实数编码，但q-gate的时候仍进行10-2-10的转化。并附一定的优化结果。(This program is single-objective optimization process of quantum coding is different from the past, with many qubit quantum code, the program uses real coding, but the q-gate, when the transformation is still underway 10-2-10. Together with some optimization results.)

Quartic Spline weight function from "An Introduction to Meshfree Methods and Their Programming [G.R. Liu, Y.T. Gu] " the orginal code is in fortran but this code is in matlab

个人项目，旅馆的查询设置例子。不要重复上码或其他好源可用下载数就会(Personal items, check the hotel setting an example. Do not repeat a good source code or other downloads will be available)

一个自己用到的用matlab编写的fdtd源程序，感觉还可以。里面的参数没有设置，可以自己根据需要设置。(Used with its own written fdtd matlab source, feeling okay. Inside the parameter is not set up my own according to their needs.)

PCM 编解码模型，信道是无噪声的，u=255，以正弦波作为测试(PCM codec model, the channel is noise-free, u = 255, as a sine wave test)

earth cordinats Calc_Azimuth_Elevation