Added PRS documentation and plot_prs_Ttracer_dumps.m script

openair1/PHY/NR_UE_ESTIMATION/plot_prs_Ttracer_dumps.m

+clc; clear all;
+dir            = input('Enter the directory path to T tracer dumps: ');
+fft_size       = input('Enter the OFDM FFT size used for file parsing: ');
+num_resources  = input('Enter number of PRS respurces: ');
+num_gnb        = input('Enter number of active gNBs: ');
+num_prs_symb   = 1;
+start_resource = 0;
+buff_offset    = start_resource*2*fft_size;
+
+%% Channel Impulse Response(CIR)
+figure, hold on;
+for i=0:num_gnb-1
+  for j=0:num_resources-1
+    file = [dir '/chT_gnb', num2str(i), '_', num2str(j), '.raw'];
+    fid = fopen(file, 'r');
+    if (fid > 0)
+        x = fread(fid, Inf, 'int16');
+    else
+        disp(['Failed to open the file ', file, '..!!'])
+        return;
+    end
+    fclose(fid);
+    
+    y = x(buff_offset+1:2:num_prs_symb*2*fft_size) + 1j*x(buff_offset+2:2:num_prs_symb*2*fft_size);
+    plot(abs(fftshift(y)));
+  end
+end
+xlabel('FFT Index'); ylabel('ABS');
+title('CHANNEL IMPULSE RESPONSE');
+hold off;
+
+%% Channel Frequncy Response(CFR)
+figure, hold on;
+for i=0:num_gnb-1
+  for j=0:num_resources-1
+    file = [dir '/chF_gnb', num2str(i), '_', num2str(j), '.raw'];
+    fid = fopen(file, 'r');
+    if (fid > 0)
+        x = fread(fid, Inf, 'int16');
+    else
+        disp(['Failed to open the file ', file, '..!!'])
+        return;
+    end
+    fclose(fid);
+    
+    y = x(buff_offset+1:2:num_prs_symb*2*fft_size) + 1j*x(buff_offset+2:2:num_prs_symb*2*fft_size);
+    plot(abs(y));
+  end
+end
+xlabel('FFT Index'); ylabel('ABS');
+title('CHANNEL FREQUENCY RESPONSE');
+hold off;
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