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说明：  利用matlab仿真扩频通信中m序列的生成(Use matlab to simulate the generation of m sequence in the spread communication)

PURPOSE: GARCH(P,Q) parameter estimation with normal innovations using analytic derivatives

最速下降法求解非线性方程组，此程序求解了【6x-sin（y）-50=0 cos（x）-4y-70=0】这一方程的解，大家可以把方程组改换，应用于自己的题目，例子。(Steepest descent method for solving nonlinear equations, this procedure solved 【6x-sin (y)-50 = 0 cos (x)-4y-70 = 0】 solution of this equation, we can change the equations, applications in their own subject, example.)

非线性光学晶体LBO的1064nm倍频角度计算(Calculation of 1064nm frequency- doubling angle for nonlinear optical crystal)

4FSK正交调制解调 其中有升余弦成型滤波，梳形内插。画出误码率曲线(4FSK modulation and demodulation with raised cosine shaping filter, comb shape interpolation. Draw the curve of error rate)

Peter Kovesi 编制的Harris角点检测Matlab程序(Peter Kovesi prepared by Harris corner detection Matlab procedures)

说明：  国外数字通信基础教材，Fundamentals of Digital Communication 英文版，作者Madhow, Upamanyu(Fundamentals of Digital Communication. Author: Madhow, Upamanyu)

This ia my circle and other programs. They compute the circle and ploit it in matlab.

常用机械优化方法。包括显式最速下降法，进退法，坐标轮换法，三次插值法。(Common mechanical optimization method.It includes explicit steepest descent method, advance and retreat method, coordinate rotation method and three interpolation method.)

《射频电路设计——理论与应用》一书课后习题第二章Matlab程序代码("RF circuit design-- Theory and Application," a book OSCAR Exercise second chapter Matlab code)