Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
41 lines
961 B
Matlab
41 lines
961 B
Matlab
clear all
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close all
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affich
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%%
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primary_synch0 = [exp(-1j*pi*25*(0:30).*(1:31)/63) 0 exp(-1j*pi*25*(32:62).*(33:63)/63)];
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primary_synch0_mod2 = zeros(1,256);
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primary_synch0_mod2((256-30):end)=primary_synch0(1:31);
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primary_synch0_mod2(1:32)=primary_synch0(32:end);
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primary_synch0_time = ifft(primary_synch0_mod2)*sqrt(256);
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%%
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c1 = xcorr(rxs(:,1),primary_synch0_time);
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c2 = xcorr(rxs(:,2),primary_synch0_time);
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c = c1+c2;
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figure(3)
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plot(abs(c))
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[m,i] = max(abs(c));
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sync_pos = i-38400;
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figure(1)
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hold on
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%plot(sync_pos,0,'rx','Markersize',20,'Linewidth',5)
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plot(sync_pos,0,'rx')
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%%
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temp = rxs(sync_pos-5*320:sync_pos-320*4-1,1);
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tempF = fft(temp(1:256));
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symb0 = [tempF(167:end,1); tempF(2:91,1)];
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%% "standard" channel estimation and FFT interpolation
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% load the pilots for the first OFDM symbol
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pilotsF
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pilot_symb0 = [ rsF(167:end,1); rsF(2:91,1)];
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h = 1./(pilot_symb0(2:6:end)).*symb0(2:6:end);
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h = fft([ifft(h); zeros(150,1)]);
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figure(4)
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plot(abs(h)) |