PN.zip_Frequency hopping_多跳频信号_跳频序列_跳频码_跳频通信系统中PN码的产生

pntaps = [0 0 1 0 0 0 0 0 0 1]; pninitial = [0 0 0 0 0 0 0 0 0 1]; pndata = zeros(1,1023); samp_per_sym = 1; pnregister = pninitial; n = 0; kk = 0; while kk == 0 n = n + 1; pndata(1,n) = pnregister(1,1); feedback = rem((pnregister*pntaps'),2); pnregister = [feedback,pnregister(1,1:9)]; if pnregister == pninitial;kk = 1; end end text = ['the period is',num2str(n,15),'.']; disp(text) pndata = repmat(pndata,samp_per_sym); kn = n*samp_per_sym; pndata = 2*pndata - 1; a = fft(pndata); b = a.*conj(a); Rm = real(ifft(b))/kn; x1 = (0:length(Rm) - 1)/samp_per_sym; x2 = 0:100; subplot(3,1,1) plot(x1,Rm,'.k');ylabel('R[m]') subplot(3,1,2) stem(x2,Rm(1:101),'.k');ylabel('Partial R[m]') subplot(3,1,3) stem(x2,pndata(1:101),'.k');ylabel('First 100 outputs') axis([0 100 -1.5 1.5])