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Assume that a direct sequence spread spectrum system uses the Barker code of length 7 (N=7) as its spreading sequence. a. Randomly generate 8 symbols (d0~d7) from the set {+1,-1}. b. If each chip of the Barker code is denoted as cj, j=0~6, spread each symbol di by the Barker code. (Please refer to p. 17 of the slides.) Use “stem” to plot the signals before spreading and after spreading

三维图形的拟合程序，两列输入数据，一列输出数据(The fitting procedure of 3D graphics )

this file give simulation for Single Input Dual Output 16-QAM Simulation with comparison in SER between Selective Combining,Equal Gain Combining and Maximum Ratio Combining methods

基于龙格库塔法的Matlab数值积分函数(Runge-Kutta numerical method based on Matlab integral function)

robotics tool for matlab

说明：  QPSK的Matlab/Simulink的调制解调仿真系统，给出接收信号眼图及系统仿真误码率，包含载波恢复，匹配滤波，定时恢复等重要模块，帮助理解QPSK的系统(QPSK Matlab/Simulink simulation system modulation and demodulation, the received signal is given eye and BER simulation systems, including carrier recovery, matching filter, timing recovery and other important module to help understand the system QPSK)

中值滤波和它的改进 自己实现的 可能比较粗略 matlab2013运行通过(Median filter and it is possible to achieve improved their sketchy matlab2013 run through)

数字射频存储器的仿真模块，验证过，可以用(Digital radio frequency memory simulation module)

optisystem下光调制演示，包括AM调制和FM调制等(optisystem Modulation Demonstrate)

PID调节器结构简单、参数易于调整，当被控对象精确数学模型难以建立、系统的参数又经常发生变化时，应用PID控制技术，在线整定最为方便。 (PID adjustor simple structure, easy adjustable parameters, when the controlled object mathematical model is hard to build up, the parameters of the system and often changes, application of PID control technology, online setting the most convenient.)