git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5204 818b1a75-f10b-46b9-bf7c-635c3b92a50f
This commit is contained in:
Florian Kaltenberger
@@ -1,77 +1,148 @@
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close all
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clear all
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nant1 = 1;
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enable_plots=2; %enables figures
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%% preload and init data
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addpath('../../../openair1/PHY/LTE_REFSIG');
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primary_synch; %loads the primary sync signal
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pss1_t = upsample(primary_synch0_time,4*4);
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pss2_t = upsample(primary_synch0_time,4*2);
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%load('E:\EMOS\corridor\ofdm_pilots_sync_2048_v7.mat');
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load('ofdm_pilots_sync_30MHz.mat');
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filename = 'E:\EMOS\corridor\eNB_data_20140319_133327.EMOS';
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nb_rb1 = 100; %this can be 25, 50, or 100
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num_carriers1 = 2048/100*nb_rb1;
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num_zeros1 = num_carriers1-(12*nb_rb1+1);
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prefix_length1 = num_carriers1/4; %this is extended CP
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ofdm_symbol_length1 = num_carriers1 + prefix_length1;
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frame_length1 = ofdm_symbol_length1*num_symbols_frame;
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useful_carriers1 = num_carriers1-num_zeros1-1;
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nb_rb2 = 50; %this can be 25, 50, or 100
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num_carriers2 = 2048/100*nb_rb2;
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num_zeros2 = num_carriers2-(12*nb_rb2+1);
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prefix_length2 = num_carriers2/4; %this is extended CP
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ofdm_symbol_length2 = num_carriers2 + prefix_length2;
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frame_length2 = ofdm_symbol_length2*num_symbols_frame;
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useful_carriers2 = num_carriers2-num_zeros2-1;
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nant1 = 2;
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nant2 = 2;
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samples_slot1 = 7680*2;
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samples_slot2 = 7680;
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samples_slot_agg = nant1*samples_slot1 + nant2*samples_slot2;
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nframes = 10;
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nframes = 50;
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slots_per_frame = 20;
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%% read data
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fid = fopen('E:\EMOS\corridor\eNB_data_20140311_173205.EMOS','r');
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[v,c]=fread(fid, 2*samples_slot_agg*slots_per_frame*nframes, 'int16',0,'ieee-le');
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d = dir(filename);
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nblocks = floor(d.bytes/(samples_slot_agg*slots_per_frame*nframes*4));
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PDP1_total = zeros(nblocks*nframes,useful_carriers1);
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PDP2_total = zeros(nblocks*nframes,useful_carriers2);
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%% main loop
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fid = fopen(filename,'r');
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block = 1;
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while ~feof(fid)
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fprintf(1,'Processing block %d of %d',block,nblocks);
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%%
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[v,c]=fread(fid, 2*samples_slot_agg*slots_per_frame*nframes, 'int16',0,'ieee-le');
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if (c==0)
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break
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end
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v0 = double(v(1:2:end,:))+1j*double(v(2:2:end,:));
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v1 = zeros(samples_slot1*slots_per_frame*nframes,nant1);
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v2 = zeros(samples_slot2*slots_per_frame*nframes,nant2);
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for slot=1:slots_per_frame*nframes
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for a1=1:nant1
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v1((slot-1)*samples_slot1+1:slot*samples_slot1,a1) = ...
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v0((slot-1)*samples_slot_agg+(a1-1)*samples_slot1+1:...
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(slot-1)*samples_slot_agg+ a1 *samples_slot1,1);
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end
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for a2=1:nant2
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v2((slot-1)*samples_slot2+1:slot*samples_slot2,a2) = ...
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v0((slot-1)*samples_slot_agg+nant1*samples_slot1+(a2-1)*samples_slot2+1:...
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(slot-1)*samples_slot_agg+nant1*samples_slot1+ a2 *samples_slot2,1);
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end
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end
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if enable_plots>=2
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figure(1)
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plot(abs(fftshift(fft(v1))))
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figure(2)
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plot(abs(fftshift(fft(v2))))
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end
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%% frame start detection
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[corr,lag] = xcorr(v2(:,1),pss2_t);
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%[m,idx]=max(abs(corr));
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[m,idx]=peaksfinder(corr,frame_length2);
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if (enable_plots>=2)
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figure(20);
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hold off
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plot(lag,abs(corr));
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hold on
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plot(lag(idx),m,'ro')
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end
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%%
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for i=1:size(idx,2)-1; % the last frame is not complite
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fprintf(1,'.');
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%frame_start2 = lag(i) - prefix_length2;
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frame_start2 = lag(idx(i))-prefix_length2;
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frame_start1 = frame_start2*2;
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% ofdm receiver
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received_f1 = OFDM_RX(v1(frame_start1:frame_start1+frame_length1,:),num_carriers1,useful_carriers1,prefix_length1,num_symbols_frame);
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received_f2 = OFDM_RX(v2(frame_start2:frame_start2+frame_length2,:),num_carriers2,useful_carriers2,prefix_length2,num_symbols_frame);
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% channel estimation (SISO)
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H1=conj(squeeze(f1(1,:,:))).*received_f1(:,:,1);
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H2=conj(squeeze(f2(1,:,:))).*received_f2(:,:,1);
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H1t = ifft(H1,[],2);
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H2t = ifft(H2,[],2);
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PDP1 = mean(abs(H1t(2:end,:).^2),1);
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PDP2 = mean(abs(H2t(2:end,:).^2),1);
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PDP1_total((block-1)*nframes+i+1,:) = PDP1;
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PDP2_total((block-1)*nframes+i+1,:) = PDP2;
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if enable_plots>=1
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figure(3)
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surf((abs(H1t)))
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xlabel('time [OFDM symbol]')
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ylabel('delay time [samples]')
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zlabel('power [dB]')
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title('H1t')
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shading interp
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figure(4)
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plot(10*log10(PDP1))
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xlabel('delay time [samples]')
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ylabel('power [dB]')
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title('PDP1')
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figure(30)
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surf((abs(H2t)))
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xlabel('time [OFDM symbol]')
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ylabel('delay time [samples]')
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zlabel('power [dB]')
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title('H2t')
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shading interp
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figure(40)
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plot(10*log10(PDP2))
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xlabel('delay time [samples]')
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ylabel('power [dB]')
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title('PDP2')
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end
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end
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fprintf(1,'\n');
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block = block+1;
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end
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fclose(fid);
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v0 = double(v(1:2:end,:))+1j*double(v(2:2:end,:));
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%%
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v1 = zeros(samples_slot1*slots_per_frame*nframes,nant1);
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v2 = zeros(samples_slot1*slots_per_frame*nframes,nant2);
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for slot=1:slots_per_frame*nframes
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v1((slot-1)*samples_slot1+1:slot*samples_slot1,1) = v0((slot-1)*samples_slot_agg+1:slot*samples_slot_agg-samples_slot2*nant2,1);
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v2((slot-1)*samples_slot2+1:slot*samples_slot2,1) = v0((slot-1)*samples_slot_agg+samples_slot1+1:slot*samples_slot_agg-samples_slot2,1);
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v2((slot-1)*samples_slot2+1:slot*samples_slot2,2) = v0((slot-1)*samples_slot_agg+samples_slot1+samples_slot2+1:slot*samples_slot_agg,1);
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end
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%%
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figure(1)
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plot(20*log10(abs(fftshift(fft(v1)))))
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figure(2)
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plot(20*log10(abs(fftshift(fft(v2)))))
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%% sync
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addpath('../../../openair1/PHY/LTE_REFSIG');
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primary_synch; %loads the primary sync signal
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pss_t = upsample(primary_synch0_time,4*2);
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[corr,lag] = xcorr(v2(:,1),pss_t);
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figure(3);
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plot(lag,abs(corr));
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%% frame start detection
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load('E:\EMOS\corridor\ofdm_pilots_sync_30MHz.mat');
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ofdm_symbol_length = num_carriers + prefix_length;
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frame_length = ofdm_symbol_length*num_symbols_frame;
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useful_carriers = num_carriers-num_zeros-1;
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% TODO: do a proper peak detection. for now just take the max
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[m,i]=max(abs(corr));
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frame_start = lag(i) - prefix_length;
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%% ofdm receiver
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received = v2(frame_start:frame_start+frame_length,1);
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received_f = zeros(num_symbols_frame,useful_carriers);
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for i=0:num_symbols_frame-1;
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ifblock=received(i*ofdm_symbol_length+[1:ofdm_symbol_length]);
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ifblock(1:prefix_length)=[];
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fblock=fft(ifblock);
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received_f(i+1,:) = [fblock(2:useful_carriers/2+1); fblock(end-useful_carriers/2+1:end)];
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end
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%% channel estimation
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H=conj(f2).*received_f;
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Ht = ifft(H,[],2);
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PDP = mean(abs(Ht(2:end,:).^2),1);
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figure(3)
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surf(20*log10(abs(Ht)))
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xlabel('time [OFDM symbol]')
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ylabel('delay time [samples]')
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zlabel('power [dB]')
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shading interp
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figure(4)
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plot(10*log10(PDP))
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xlabel('delay time [samples]')
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ylabel('power [dB]')
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@@ -2,7 +2,7 @@ function [m,ind]=peaksfinder(corr,frame_length)
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threshold=45000;
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threshold=max(abs(corr))*0.75;
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consecutivePos=[];
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highCorrVal=find(abs(corr)>threshold);
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num_peak=0;
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