DatagramChannelTest

说明：  中国的手机游戏市场用户调研报告2008年度(China mobile phone game market research report of 2008 users)

说明：  2. 关于无线信道的多普勒谱，请回答以下问题： (1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请描述产生混叠的各种原因； (2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理； (3) 请用Simulink工具编写代码(S-Function方式)，产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请描述：自己用计算机产生的经典谱是正确的依据。(2. Regarding the doppler spectrum of the wireless channel, please answer the following questions: (1) in some wireless channels, doppler frequency shift will cause aliasing of the output signals of the wireless channel.Describe the various causes of aliasing; (2) there is a classic spectrum in the doppler spectrum in the wireless channel, please explain the mechanism of producing this spectrum shape; (3) please use Simulink tool to write code (s-function mode) to generate a single-path Rayleigh channel, whose doppler spectrum is the classical spectrum, in which the moving rate is 120km/h.And please describe: your own computer generated classical spectrum is the correct basis.)

说明：  实现了一个直接扩频系统，使用BPSK作为调制解调方法。并比较白噪声AWGN及瑞利衰落(rayleigh fading)环境下，误码率的影响。(There are two files in the zip folder. bpsk_spread.m and jakesmodel.m Steps for simulation: 1] Run jakesmodel.m first 2] Then run bpsk_spread.m . 3] Note that during the first run bpsk_spread.m has no rayleigh fading.This is because the corresponding code has been commented 4] The resulting performance is stored in BER_awgn. 5] Now uncomment the Rayleigh Fading code in bpsk_spread.m file. 6] Same time comment BER_awgn (line 112) and uncomment BER_ray variable. 7] Run the simulation. To compare the perfromances of the receiver using DSSS plot the BER_awgn and BER_ray >>semilogy([1:8],BER_awgn(1:8), g* ) hold on semilogy([1:8],BER_ray(1:8), -.b* ) hold on grid on )

COM技术内幕，com这方面的技术资料，找了很久··希望对大家有所帮助吧··(COM technology insider com, this technical information, looking for a long time we hope to help)

BP神经网络用于函数拟合与模式识别，基于SVPWM的三电平逆变的matlab仿真，包括压缩比、运行时间和计算复原图像的峰值信噪比。( BP neural network function fitting and pattern recognition, Based on SVPWM three-level inverter matlab simulation, Including compression ratio, image restoration computing uptime and peak signal to noise ratio.)

卡尔曼滤波器工具箱，非常适合初学者学习卡尔曼滤波器，里面有比较详细地程序(Kalman Filter toolbox MATLAB)

说明：  基于电能计量芯片HLW8012的应用研究(Research on the application of power metering chip hlw8012 research on the application)

说明：  实现Ethercat现场通讯的主从站代码实例(An Example of Master-slave Station Code for Ethercat Field Communication)

降低PAPR编码方法中的格雷码仿真程序，能仿真出结果。仿真参数为:子载波数目N=16,BPSK调制，过采样因子w=16，(Reduce the PAPR coding method of Gray code emulator, simulation results. The simulation parameters: number of subcarriers N = 16, BPSK modulation over-sampling factor w = 16,)

My test GPRS project. It mus to do close connection when it open