crosscorr_deng_40.asv

calculation of the autocorrelation peak sidelobe levels and corsscorrelation. CE sequence, frank aut

%Autocorrelation peak sidelobe levels and cross-correlation peak for deng
%optimized polyphase sequences of length =L, M=M
clear, close all;
L=128;
M=3;
S=deng_seq(L);

nfft=2*L-1;
srfft=zeros(M,nfft);
for m=1:M
srfft(m,:)=fft(S(m,:),nfft);
end

Corr=zeros(M,M,nfft);
Cmax=zeros(M,M);
SL=zeros(M,M,nfft-1);
for m=1:M
    for n=1:M
        if m==n
            Corr(m,n,:)=fftshift(abs(ifft(srfft(m,:).* conj(srfft(n,:))))/(L));
            SL(m,n,1:(nfft-1)/2)=Corr(m,n,1:(nfft-1)/2);
            SL(m,n,(nfft+1)/2:nfft-1)=Corr(m,n,(nfft+1)/2+1:nfft);
            Cmax(m,n)=20*log10( max( SL(m,n,:) ) );
        else
            Corr(m,n,:)=fftshift(abs(ifft(srfft(m,:).* conj(srfft(n,:))))/(L));
            Cmax(m,n)=20*log10(max(Corr(m,n,:)));
        end
    end     
end
% Mean autocorrelation peak sidelobe level(AC PSL), Mean
% cross-correlation(XC) and mean cross-correlation peaks(XC peak) deng sequences of 
% length=128 (L=128,M=3)