83 lines
2.2 KiB
Matlab
83 lines
2.2 KiB
Matlab
%% =========================================================
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% Data
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% =========================================================
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X = single(complex_out.Data);
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%% =========================================================
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% Parameters
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% =========================================================
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Fs = 512e6; % Sampling rate (Hz)
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N = 512; % Frame size
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% Your data variable (rename if needed)
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% Expected size: [512 x 4 x 8]
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% X(frameSamples, frameIndex, timeIndex)
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% Example: X = your_workspace_variable;
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[nSamples, nFrames, nTime] = size(X);
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%% =========================================================
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% FFT Computation
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% =========================================================
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FFT_all = zeros(N, nFrames*nTime);
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idx = 1;
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for t = 1:nTime
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for f = 1:nFrames
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x = X(:, f, t);
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% Optional window (uncomment if needed)
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% w = hann(N);
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% x = x .* w;
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Xf = fftshift(fft(x));
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FFT_all(:, idx) = abs(Xf);
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idx = idx + 1;
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end
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end
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%% =========================================================
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% Axes
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% =========================================================
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f_axis = (-N/2 : N/2-1) * (Fs/N) / 1e6; % MHz
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t_axis = 1:(nFrames*nTime); % frame index
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%% =========================================================
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% Spectrogram-like view (BEST)
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% =========================================================
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figure;
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surf(t_axis, f_axis, 20*log10(FFT_all + 1e-12), 'EdgeColor', 'none');
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view(2);
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axis tight;
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xlabel('Frame index');
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ylabel('Frequency (MHz)');
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title('FFT over time (per frame)');
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colorbar;
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%% =========================================================
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% 3D Visualization (optional)
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% =========================================================
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figure;
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surf(t_axis, f_axis, FFT_all, 'EdgeColor', 'none');
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xlabel('Frame index');
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ylabel('Frequency (MHz)');
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zlabel('Magnitude');
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title('3D FFT evolution');
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%% =========================================================
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% Single frame debug (optional)
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% =========================================================
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figure;
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x_dbg = X(:,1,1);
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Xf_dbg = fftshift(fft(x_dbg));
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plot(f_axis, 20*log10(abs(Xf_dbg)+1e-12));
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grid on;
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xlabel('Frequency (MHz)');
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ylabel('Magnitude (dB)');
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title('Single Frame FFT'); |