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43 lines
1.1 KiB
Matlab
43 lines
1.1 KiB
Matlab
clear;
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sym_len=128;
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hflen = (sym_len/128)*1920*5;
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samp_rate = (sym_len/128)*1920000;
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N_id_2=0;
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input=read_complex('../../debug/lte_signal.dat', hflen*240);
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addpath('../../debug/srslte/lib/sync/test')
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off=100;
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halfframes=reshape(input(hflen-off+1:end-hflen-off),hflen,[]);
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[n m]=size(halfframes);
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fo=linspace(-30000,30000,m);
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nreal=1;
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cfdl=struct('NDLRB',6,'CyclicPrefix','Normal','NCellID',0,'CellRefP',1,'DuplexMode','FDD');
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cfo=zeros(m,3);
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toffset=zeros(m,2);
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for i=1:m
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x = halfframes(:,i);
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t = (0:n-1).'/samp_rate;
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x = x .* exp(1i*2*pi*fo(i).*t);
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cfo_=zeros(nreal,2);
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idx_=zeros(nreal,2);
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for j=1:nreal
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y=awgn(x,5);
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cfo_(j,1) = lteFrequencyOffset(cfdl,y)/15000;
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[idx_(j,1), cfo_(j,2)] = find_pss(y,N_id_2);
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[idx_(j,2), corr] = srslte_cp_synch(cfdl,y);
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cfo_(j,3) = -angle(corr(idx_(j,2)+1))/2/pi;
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idx_(j,1) = idx_(j,1)-961;
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end
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cfo(i,:)=mean(cfo_,1);
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toffset(i,:)=mean(idx_,1);
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end
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error=abs(cfo-repmat(fo',1,3)/15000);
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semilogy(fo/15000,error)
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%plot(fo/15000,toffset)
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legend('Matlab','PSS-based','CP-based')
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