GMSK

基于MATLAB的快速傅里叶变换，与调用的函数结果是一样的(MATLAB-based fast Fourier transform, and call the function result is the same as)

产生右图所示图像f1(m,n)，其中图像大小为256×256，中间亮条为128 ×32，暗处=0，亮处=100。对其进行FFT： ① 同屏显示原图f1(m,n)和FFT(f1)的幅度谱图； ② 若令f2(m,n)=（-1）m+n f1(m,n)，重复以上过程，比较二者幅度 谱的异同，简述理由； ③ 若将f2(m,n)顺时针旋转90 度得到f3(m,n)，试显示FFT(f3)的幅 度谱，并与FFT(f2)的幅度谱进行比较； ④ 若将f1(m,n) 顺时针旋转90 度得到f4(m,n)，令f5(m,n)=f1(m,n)+f4(m,n)，试显 示FFT(f5)的幅度谱，并指出其与FFT(f1)和FFT(f4)的关系； ⑤ 若令f6(m,n)=f2(m,n)+f3(m,n)，试显示FFT(f6)的幅度谱，并指出其与FFT(f2)和 FFT(f3)的关系，比较FFT(f6)和FFT(f5)的幅度谱。(Generating an image f1 (m, n) shown in the figure, wherein the image size is 256 256, the intermediate light bar 128 32 0 = dark, bright Department 100. Its FFT: ① screen display picture f1 (m, n) and the FFT (f1) of the amplitude spectrum ② If so f2 (m, n) = (-1) m+n f1 (m, n), repeat The above process, comparing the amplitude spectrum of the similarities and differences between the two, brief reasons ③ If f2 (m, n) 90 degrees clockwise to get f3 (m, n), try to display FFT (f3) the amplitude spectrum and with the FFT (f2) comparing the amplitude spectrum ④ If f1 (m, n) obtained by 90 degrees clockwise f4 (m, n), so f5 (m, n) = f1 (m, n)+f4 (m, n ), try to display FFT (f5) amplitude spectrum, and pointed out its relationship with the FFT (f1) and FFT (f4) of ⑤ If so f6 (m, n) = f2 (m, n)+f3 (m, n) and try to display the FFT (f6) amplitude spectrum, and pointed out its relationship with the FFT (f2) and FFT (f3), comparing FFT (f6) and FFT (f5) amplitude spectrum.)

Calculate the capacity of MIMO system in iid channel model scenario and plot.

说明：  ：抽取是软件无线电中最核心部分。通过对多项抽取结构的分析，设计出一种多 级抽取滤波器的实现方案，并通过MATLAB仿真实现。 关键词：软件无线电；多相结构；多级抽取滤波器(: Extraction is the most central part of the software radio. By taking a number of structural analysis, design a multi-stage decimation filter implementation scheme, and Simulation by MATLAB. Key words: software radio heterogeneous structure multi-stage decimation filter)

维特比算法，用于对卷积码进行解码，算法最小化汉明距离而不是似然函数(Viterbi algorithm. The Viterbi decoder for convolutional codes.This algorithm minimizes the metric rather than maximizingthe likelihood.)

matlab子程序，用于光线追迹，计算光线经过透镜面后的坐标和方向。(MATLAB subroutine for ray tracing to calculate the coordinates and direction of light through the lens surface.)

matlb编写的IIR滤波器程序，按照给定指标采用模拟低通滤波器（巴特沃思低通或者切比雪夫低通）去逼近理想模拟低通滤波器 ，然后通过双线性变换法对模拟滤波器进行数字化，得到数字滤波器 。(IIR filter matlb prepared by the procedure, according to set targets and analog low-pass filter (Butterworth low-pass or low-pass Chebyshev) approximation to the ideal analog low-pass filter, and then through the bilinear transformation method for analog filtering device to digitize, the digital filter.)

matlab产生海洋随机粗糙面的函数 输入参数为 长度 点数 Ku Kl 风速(matlab generate random rough surface ocean input parameters of function points for the length of the wind speed Ku Kl)

Boost converter for voltage boost and buck.

深海声道声线图绘制程序，仿真绘制深海声传播图形；并设计了可更改参数的图表及清零功能。(Deepwater channel sound line drawing program, drawing deep sea sound propagation simulation graphics and designed charts and clear function can change the parameters.)