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通过4阶龙格库塔方法求解混沌系统的微分方程(Through four order Runge-Kutta method for solving differential equations of chaotic systems)

例4：在sinc(t)信号中叠加噪声，分析对应频谱 fs=100 采样频率,必须大于两倍基带信号最高频率 ts=1/fs 采样时间间隔 T=2 时间窗大小 ( x=x+0.1*randn(1,N) x=awgn(x,-10, measured ) figure plot(t,x) title( 时域信号图 ) xlabel( t /s ) y=fft(x,N) figure if mod(N,2)~=0 N=N-1 end f=linspace(0,fs/2,N/2) plot(f,abs(y(1:N/2))*2/N) title( 叠加噪声的sinc(t)信号频谱 ) xlabel( f /Hz ) figure y0=y(1:N/2) P=y0.*conj(y0)/N P=10*log10(P) plot(f,P) title( 功率谱 ) xlabel( f /Hz ) )

压缩文件里边包含好几个合成地震记录的程序，包括楔形模型，断层等，有的还画出了地震记录，反射系数的振幅谱~(the zip file contains several synthetic seismogram programs, including wedge model, fault model, etc., some even draw the earthquake records, the reflection coefficient of amplitude spectrum ~)

说明：  一个完整的OFDM通信系统，采用16QAM调制，设置不同的信噪比，得到误码率(A complete OFDM communication system adopts 16QAM modulation, sets different SNR, and gets bit error rate)

this is a file for embedding a messge in an image

In computer science, particle swarm optimization (PSO) is a computational method that optimizes a problem by iteratively trying to improve a candidate solution with regard to a given measure of quality.

正交匹配追踪算法—基于压缩感知信号重构.(Orthogonal Matching Pursuit algorithm- based on compressed sensing signal reconstruction)

matlab自适应滤波器的程序.txt difenn de ru(matlab adaptive filter process. txt difenn de ru)

OFDM限幅类峰均比,用于仿真OFDM系统中的限幅类峰均比。(Limiter type OFDM PAPR for OFDM simulation system PAPR limiting category.)

超声成像得到的射频信号转换为包络信号时的一维滤波(RF signals into ultrasound imaging to obtain one-dimensional filtering of the envelope signal when)