least_suqare

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说明：  在OFDM中若干个窄带信号在频域是非常密集的并通过正交载波传输。因此使用数字信号处理技术让这些信号结合在一起比使用大量的调制器、滤波器要更好。从数学上说每个载波都可以被看做一个单一的，复杂的波信号被调制到一个载波频率。(In OFDM, several narrowband signals are very dense in frequency domain and transmitted by orthogonal carrier. Therefore, using digital signal processing technology to combine these signals is better than using a large number of modulators and filters. Mathematically, each carrier can be viewed as a single, complex wave signal modulated to a carrier frequency.)

EDFA matlab coden Erbium Doped Fiber Amplifier (EDFA) consists of a piece of fiber of length L, whose core is uniformly doped with Erbium ions. Such ions can be thought of as simple two-level systems, i.e., they can have only two energy states: 1) a fundamental state and 2) an excited state. A strong ``pump laser light at the proper wavelength (usually 980 nm or 1480 nm) is propagated into the core of the fiber in order to excite its ions.

物资流转内部管理系统 1.0 测试为主(概述):用户名和密码都是admin 一、网络分布初定为： 1、车间（一金工、二金工、铸钢）； 2、仓库（精铸仓库、砂铸仓库）； 3、生产部； 4、质检部； 5、财务部；(Internal management system 1.0 test-based material flow (Overview): username and password are admin the network distribution tentative: 1 workshop (a metalworking two metalworking, cast steel) 2, the Warehouse (Cast warehouse, sand warehouse casting) 3, the production department 4, QC 5, the Finance Ministry )

TD-SCDMA系统联合检测中的信道估计、信道估计后处理、信道估计串行干扰消除后处理算法的源代码。其中，信道估计采用频域快速FFT法以减少运算量；后处理采用激活窗检测法，只保留激活用户的多径信息，其余置0，以达到降低干扰及噪声的目的；串行干扰消除可以消除多小区信道估计的干扰，以得到本小区的纯净信道估计结果。(TD-SCDMA system, joint detection of channel estimation, channel estimation and post-processing, channel estimation and post-processing the serial interference cancellation algorithm source code. Among them, frequency-domain channel estimation using fast FFT method to reduce computational complexity post-processing detection method used to activate windows, leaving only the active user' s multi-path information, the remaining set 0, in order to achieve the purpose of reducing interference and noise serial interference cancellation can be Multi-cell channel estimation to eliminate the interference in order to get the purity of the cell channel estimation result.)

一种处理端点效应的程序，镜像延拓，对于处理端点效应有着较好的效果( The end effect of a treatment program, mirror extension, for processing end effect has a better effect)

pfc电路的仿真，控制方式为平均电流法,结果正确可以使用(pfc circuit simulation, control the average current method, the results can be used properly)

运用MATLAB编程，制作属于自己的时钟，高逼格记录时间的流逝(Using MATLAB programming to make their own clocks and record the passage of time with high-precision grids~)

完整版的PHP聊天室，实现用户在线聊天，附带sql数据库文件，在本地配置php运行环境后，导入sql文件即可使用 界面还有待完善，可自行修改