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正交频分复用（OFDM）是一种特殊的多载波传输技术。它可以有效地对抗多径衰落，能够以很高的频谱利用率来实现高速数据传输。分析介绍了OFDM系统的基本原理及系统性能，以Matlab为开发平台，仿真了OFDM系统的误码率，仿真结果表明OFDM系统在较低信噪比下也具有较好的性能(Orthogonal Frequency-division Multiplexing（OFDM） is a special kind of multi-cartier transmission technology. It can effectively overcome multi-path fading and increase the spectral usage efficiency to implement high-speed data transmission. This paper analyzes the basic principle of OFDM system and system performance, and simulates the Bit Error Rate （BER） of OFDM system on the platform of Matlab. The simulation results show that the OFDM has a good performance.[)

永磁同步电动机的矢量控制仿真程序，实现速度闭环和电流闭环，可以直接运行(Permanent Magnet Synchronous Motor Vector Control program, to achieve the speed loop and current loop can be directly run)

说明：  蒙特卡洛模拟，柯西分布，主要用于气体吸附的模拟(Monte Carlo simulation, the Cauchy distribution, is mainly used for the simulation of gas adsorption)

信号的仿真，误码率的仿真，互相学习，互相进步(change zhe singal，and find the rate of error)

脉冲微分方程-生物数学模型持久性和灭绝的数值仿真MATLAB程序(The pulse differential equations- bio-mathematical model of persistence and extinction of numerical simulation of MATLAB program)

说明：  本压缩包是对资料进行整合，整合内容均可用。包括快速emd eemd等资料(This compression package is for data integration, and the integrated content is available. Including fast EMD EEMD and other data)

椭圆滤波器，fp=2400hz,fs=5000hz,rp=3dB,rs=25dB,求其3dB时的各项参数！(Elliptic filter, fp = 2400hz, fs = 5000hz, rp = 3dB, rs = 25dB, for its 3dB at the time of the parameters!)

说明：   本书内容深入浅出、图文并茂、理论与实训紧密结合，各章之间既相互联系又相对独立，读者可根据需要选择阅读。本书每章内容都包括两部分，一部分为理论讲解，以丰富多样的实例作为支撑；另一部分为与理论部分配套的MATLAB仿真实训，本部分与理论部分前后呼应，同时密切结合生产实践。 (The Guide book illustrations, theory and practical training closely, both among the various chapters of interconnected and relatively independent, readers may be selected to read. Content of each chapter the book consists of two parts, the theoretical explanation, to a variety of examples as support the other part is matching with the theoretical part of the MATLAB simulation training, this section with the theoretical part of the previous ones, while keeping a close with the production practice.)

并行组合扩频系统程序，包括数据映射程序和数据逆映射程序(Parallel Combinatory Spread Spectrum system simulation)

用有效集方法求解一般凸二次规划问题的Matlab 程序(The Matlab program for general convex quadratic programming is solved by using effective set method.)