This was moved from the main MATLAB directory

matlab/updated_scripts/plot_symbol_boundaries.m

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+function [] = plot_symbol_boundaries(samples, sample_rate, figure_num)
+    long_cp_len = round(1/192000 * sample_rate);
+    short_cp_len = round(0.0000046875 * sample_rate);
+    fft_size = sample_rate / 15e3;
+
+    % Plot the time domain
+    figure(figure_num);
+    plot(10 * log10(abs(samples)));
+    
+    % Tranceparency of each box (so the waveform is still visible)
+    face_opacity = 0.25;
+    
+    % Don't show the lines between the boxes.  Just gets in the way
+    edge_color = [0, 0, 0, 0];
+    
+    % Define the box colors (with transparency)
+    face_color_red   = [1, 0, 0];
+    face_color_green = [0, 1, 0];
+    
+    % The Y axis of the plot is in dB, so draw a box that starts at -30 dB and
+    % goes up by 25 dB (-5 dB).  These numbers just happened to work out with
+    % the test data and will likely change for other collects
+    box_y_start = -30;
+    box_y_height = 25;
+    
+    for symbol_idx=0:8
+        if (mod(symbol_idx, 2) == 0)
+            color = face_color_red;
+        else
+            color = face_color_green;
+        end
+    
+        relative_offset = symbol_idx * (fft_size + short_cp_len);
+        r = rectangle('Position', [1 + relative_offset, box_y_start, fft_size + short_cp_len, box_y_height]);
+
+        if (exist('OCTAVE_VERSION', 'builtin'))
+            set(r, "FaceColor", color);
+            set(get(r, 'children'), "facealpha", face_opacity);
+        else
+            set(r, "FaceColor", [color, face_opacity]);
+        end
+    end
+
+    title('OFDM Symbol Boundaries')
+end