seems finished

2026-05-24 21:10:00 +02:00
parent 0df0c5da43
commit 56c7a51411
11 changed files with 348 additions and 130 deletions
@@ -0,0 +1,43 @@
+function result = analyzeTrace(trace_file, channel, window, overlap, fft_precision, sample_rate)
+    trace = load(trace_file, "iq");
+    
+    % 1
+    duration = length(trace.iq) / sample_rate;
+    
+    % 2
+    [S, F, T] = spectrogram(trace.iq, window, overlap, fft_precision, sample_rate, "centered");
+    
+    % 3
+    mag = abs(S).^2;
+    P_dB = linearTodB(mag);
+    
+    % Sum all frequency bins per time slot to obtain total channel power.
+    channel_power_linear = sum(mag, 1);
+    channel_power_dB = linearTodB(channel_power_linear);
+    
+    noise_floor_linear = prctile(channel_power_linear, 10);
+    noise_floor = linearTodB(noise_floor_linear);
+    
+    % 4
+    occupancy = sum(channel_power_dB > noise_floor + 10) / numel(channel_power_dB) * 100;
+    
+    result.trace_file = trace_file;
+    result.iq = trace.iq;
+    result.channel = channel;
+    result.duration = duration;
+    
+    result.S = S;
+    result.F = F;
+    result.T = T;
+    
+    result.mag = mag;
+    result.P_dB = P_dB;
+    
+    result.channel_power_linear = channel_power_linear;
+    result.channel_power_dB = channel_power_dB;
+    
+    result.noise_floor_linear = noise_floor_linear;
+    result.noise_floor = noise_floor;
+    
+    result.occupancy = occupancy;
+end