mseqxcorr.m

来自「自适应滤波原理_西蒙.赫金_Matlab_源代码 希望能够对学习自适应滤波技术」· M 代码 · 共 22 行

%-------------------------------------------------------------
%  Compute autocorrelation of an m-sequence
%-------------------------------------------------------------

%--- compute maximal length sequence of length 2^7-1 ---
N = 4;
m = 2^N -1;   % length
seq = mseq(N);

%--- oversample by 4 ---
osMseq = ones(4,1)*seq;
osMseq = osMseq(:);

%--- compute auto-correlation ---
h12 = xcorr([osMseq' osMseq' osMseq'], osMseq');
plot([-3*4*m:3*4*m-2]-4*m+1,(h12)/(4*m)); grid on
axis([-2*m 2*m -.1 1])
ylabel('Normalized Auto-correlation')
xlabel('Delay(samples)')