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Disabled automatic CFO detection 

This logic is flawed and is being worked on
gr-droneid-3.8
David Protzman 2022-04-08 16:02:24 -04:00
rodzic 53c8f27ebe
commit fd63e285af
1 zmienionych plików z 7 dodań i 6 usunięć
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matlab/automatic_detector.m
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@ -105,20 +105,21 @@ true_start_index = round(start_offset/decimation_rate);
plot_symbol_boundaries(samples, critial_sample_rate, 4);
%% Coarse frequency adjustment
offset_freq = -.156e3;
offset_adj = offset_freq / critial_sample_rate;
% samples = samples .* exp(1j * 2 * pi * offset_adj * (0:length(samples)-1));
[offset_est] = estimate_cp_freq_offset(samples, fft_size, short_cp_len, long_cp_len);
% My CFO detection isn't working, so rotate the constellation by hand (just eyeballing the constellation plots)
offset_adj = -1.015625e-05;
samples = samples .* exp(1j * 2 * pi * offset_adj * (0:length(samples)-1));
% [offset_est] = estimate_cp_freq_offset(samples, fft_size, short_cp_len, long_cp_len);
% DANGER: I have no idea why this is necessary or why it's equal to the
% number of OFDM symbols, but here it is. It's likely that my CFO
% estimation logic is bad. But, this works for the moment, and temporary
% fixes are never actually kept around in code forever...
offset_est = offset_est * 9;
% offset_est = offset_est * 9;
% Apply the offset correction
samples = samples .* exp(1j * 2 * pi * offset_est * (0:length(samples)-1));
% samples = samples .* exp(1j * 2 * pi * offset_est * (0:length(samples)-1));
%% Symbol extraction