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