updated emos_read scripts and signal generation script

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5207 818b1a75-f10b-46b9-bf7c-635c3b92a50f

targets/PROJECTS/CORRIDOR/OFDM_RX.m

+function received_f = OFDM_RX(received,num_carriers,useful_carriers,prefix_length,num_symbols_frame)
+nant = size(received,2);
+ofdm_symbol_length = num_carriers + prefix_length;
+received_f = zeros(num_symbols_frame,useful_carriers,nant);
+for j=0:num_symbols_frame-1;
+    ifblock=received(j*ofdm_symbol_length+(1:ofdm_symbol_length),:);
+    ifblock(1:prefix_length,:)=[];
+    fblock=fft(ifblock,[],1);
+    received_f(j+1,:,:) = [fblock(2:useful_carriers/2+1,:); fblock(end-useful_carriers/2+1:end,:)];
+end
\ No newline at end of file

targets/PROJECTS/CORRIDOR/OFDM_TX_FRAME_MIMO.m

@@ -18,7 +18,7 @@ elseif (num_ant ==2)
     f_dec = 2;
 elseif (num_ant == 4)
     t_dec = 2;
-    f_dec = 2;
+    f_dec = 4;
 else
     error('Only 1, 2 or 4 antennas supported');
 end
@@ -29,7 +29,7 @@ sig_f = zeros(num_ant,num_symbols_frame,num_useful_carriers);
 for a=1:num_ant
 for k=(floor((a-1)/2)+1):t_dec:preamble_length
     QAM4_preamble = zeros(1,num_useful_carriers);
-    QAM4_preamble((mod(a-1,2)+1):f_dec:num_useful_carriers) = QAM_MOD(4,floor(4*abs(rand(1,num_useful_carriers/f_dec))));
+    QAM4_preamble(2*mod(a-1,2)+1:f_dec:num_useful_carriers) = QAM_MOD(4,floor(4*abs(rand(1,num_useful_carriers/f_dec))));
     sig(a,(k-1)*(num_carriers+prefix_length)+1:k*(num_carriers+prefix_length)) = OFDM_TX(num_carriers,num_zeros,prefix_length,QAM4_preamble);
     sig_f(a,k,:) = QAM4_preamble;
 end

targets/PROJECTS/CORRIDOR/emos_read.m

 close all
 clear all
 
-enable_plots=1; %eanbles figures
+enable_plots=2; %eanbles figures
 
 %% preload and init data
 addpath('../../../openair1/PHY/LTE_REFSIG');
 primary_synch; %loads the primary sync signal
-pss_t = upsample(primary_synch0_time,4*4);
+pss_t = upsample(primary_synch0_time,4);
+
+%load('E:\EMOS\corridor\ofdm_pilots_sync_2048_v7.mat');
+load('ofdm_pilots_sync_30MHz.mat');
 
-%load('../LOCALIZATION/ofdm_pilots_sync_2048.mat');
-load('E:\EMOS\corridor\ofdm_pilots_sync_2048_v7.mat');
 ofdm_symbol_length = num_carriers + prefix_length;
 frame_length = ofdm_symbol_length*num_symbols_frame;
 useful_carriers = num_carriers-num_zeros-1;
 
-filename = 'E:\EMOS\corridor\eNB_data_20140108_185919.EMOS';
-samples_slot = 7680*2;
+filename = 'E:\EMOS\corridor2\eNB_data_20140321_184441.EMOS';
+samples_slot = 7680/2;
 slots_per_frame = 20;
 nframes = 100;
+nant=3;
 
 d = dir(filename);
-nblocks = floor(d.bytes/(samples_slot*slots_per_frame*nframes*4));
-PDP_total = zeros(nblocks*nframes,useful_carriers);
+nblocks = floor(d.bytes/(samples_slot*slots_per_frame*nframes*nant*4));
+PDP_total = zeros(nblocks*nframes,useful_carriers/4);
 
 %% main loop
 fid = fopen(filename,'r');
@@ -29,42 +31,53 @@ block = 1;
 while ~feof(fid)
     fprintf(1,'Processing block %d of %d',block,nblocks);
     
-    [v,c]=fread(fid, samples_slot*slots_per_frame*nframes*2, 'int16',0,'ieee-le');
-    v2 = double(v(1:2:end))+1j*double(v(2:2:end));
+    [v,c]=fread(fid, samples_slot*slots_per_frame*nframes*nant*2, 'int16',0,'ieee-le');
+    if (c==0)
+        break
+    end
+    v1 = double(v(1:2:end))+1j*double(v(2:2:end));
     
-    [corr,lag] = xcorr(v2,pss_t);
+    v2 = zeros(samples_slot*slots_per_frame*nframes,nant);
+    for slot=1:slots_per_frame*nframes
+        for a=1:nant
+            v2((slot-1)*samples_slot+1:slot*samples_slot,a) = ...
+                v1((slot-1)*samples_slot*nant+(a-1)*samples_slot+1:...
+                   (slot-1)*samples_slot*nant+ a   *samples_slot,1);
+        end
+    end
 
     if enable_plots>=2
         figure(1)
         plot(abs(fftshift(fft(v2))))
-
-        figure(2);
-        plot(lag,abs(corr));
     end
     
     %% frame start detection
-    %[m,i]=max(abs(corr));
+    [corr,lag] = xcorr(v2(:,1),pss_t);
+    %[m,idx]=max(abs(corr));
     [m,idx]=peaksfinder(corr,frame_length);
     
+    if enable_plots>=2
+        figure(2);
+        hold off
+        plot(lag,abs(corr));
+        hold on
+        plot(lag(idx),m,'ro')
+    end
+    
+    
+    %%
     for i=1:size(idx,2)-1; % the last frame is not complite
         fprintf(1,'.');
         frame_start = lag(idx(i))-prefix_length;
         % frame_start = lag(i) - prefix_length;
         
         %% ofdm receiver
-        received = v2(frame_start:frame_start+frame_length);
-        received_f = zeros(num_symbols_frame,useful_carriers);
-        for j=0:num_symbols_frame-1;
-            ifblock=received(j*ofdm_symbol_length+(1:ofdm_symbol_length));
-            ifblock(1:prefix_length)=[];
-            fblock=fft(ifblock);
-            received_f(j+1,:) = [fblock(2:useful_carriers/2+1); fblock(end-useful_carriers/2+1:end)];
-        end
+        received_f = OFDM_RX(v2(frame_start:frame_start+frame_length,:),num_carriers,useful_carriers,prefix_length,num_symbols_frame);
         
         %% channel estimation
-        H=conj(f).*received_f;
+        H=conj(squeeze(f3(1,3:2:end,1:4:end))).*received_f(3:2:end,1:4:end,1);
         Ht = ifft(H,[],2);
-        PDP = mean(abs(Ht(2:end,:).^2),1);
+        PDP = mean(abs(Ht).^2,1);
         PDP_total((block-1)*nframes+i+1,:) = PDP;
         
         if enable_plots>=1

targets/PROJECTS/CORRIDOR/emos_read_ca.m

@@ -40,8 +40,8 @@ slots_per_frame = 20;
 
 d = dir(filename);
 nblocks = floor(d.bytes/(samples_slot_agg*slots_per_frame*nframes*4));
-PDP1_total = zeros(nblocks*nframes,useful_carriers1);
-PDP2_total = zeros(nblocks*nframes,useful_carriers2);
+PDP1_total = zeros(nblocks*nframes,useful_carriers1/2);
+PDP2_total = zeros(nblocks*nframes,useful_carriers2/2);
 
 %% main loop
 fid = fopen(filename,'r');
@@ -104,12 +104,12 @@ while ~feof(fid)
         received_f2 = OFDM_RX(v2(frame_start2:frame_start2+frame_length2,:),num_carriers2,useful_carriers2,prefix_length2,num_symbols_frame);
         
         % channel estimation (SISO)
-        H1=conj(squeeze(f1(1,:,:))).*received_f1(:,:,1);
-        H2=conj(squeeze(f2(1,:,:))).*received_f2(:,:,1);
+        H1=conj(squeeze(f1(1,3:2:end,1:2:end))).*received_f1(3:2:end,1:2:end,1);
+        H2=conj(squeeze(f2(1,3:2:end,1:2:end))).*received_f2(3:2:end,1:2:end,1);
         H1t = ifft(H1,[],2);
         H2t = ifft(H2,[],2);
-        PDP1 = mean(abs(H1t(2:end,:).^2),1);
-        PDP2 = mean(abs(H2t(2:end,:).^2),1);
+        PDP1 = mean(abs(H1t).^2,1);
+        PDP2 = mean(abs(H2t).^2,1);
         PDP1_total((block-1)*nframes+i+1,:) = PDP1;
         PDP2_total((block-1)*nframes+i+1,:) = PDP2;
         

targets/PROJECTS/CORRIDOR/generation_ca.m

@@ -89,3 +89,8 @@ save('ofdm_pilots_sync_30MHz.mat','-v7','s1','s2','s3','f1','f2','f3','num_carri
 s_all = sum(s,1);
 s_all(1:5120) = s(1,1:5120);
 mat2wv(s_all, 'ofdm_pilots_sync_30MHz.wv', sample_rate, 1);
+
+s_all = sum(s3,1);
+s_all(1:640) = s3(1,1:640);
+mat2wv(s_all, 'ofdm_pilots_sync_5MHz.wv', 7.68e6, 1);
+