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Now have bits

gr-droneid-3.8
David Protzman 2022-04-07 16:27:06 -04:00
rodzic 046e92daca
commit e788f0a678
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11
matlab/automatic_detector.m
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@ -165,21 +165,32 @@ occupied_carriers = 600;
data_carriers_left = (fft_size/2)-(occupied_carriers/2)+1:fft_size/2;
data_carriers_right = (fft_size/2)+2:fft_size/2+(occupied_carriers/2)+1;
% Place to store the data carrier samples
data_carriers = zeros(7, occupied_carriers);
% Plot and extract the data carriers from the 7 data carrying OFDM symbols
figure(6);
output_idx = 1;
% Symbols 4 and 6 are ZC sequences and do not contain data
for idx=[1,2,3,5,7,8,9]
subplot(3, 3, idx);
% Get all of the freq domain samples for the current symbol, extract
% out just the data carriers, and plot
carriers = symbols_freq_domain(idx,:);
data_carriers(output_idx,:) = carriers([data_carriers_left, data_carriers_right]);
plot(squeeze(data_carriers(output_idx,:)), 'o');
output_idx = output_idx + 1;
end
% Plot the data carriers as one constellation (first one with lines, second
% with dots)
figure(7);
subplot(1, 2, 1);
plot(squeeze(data_carriers));
subplot(1, 2, 2);
plot(squeeze(data_carriers), 'o');
% Demodulate the QPSK and assume it's gray coded
demodulated_bits = pskdemod(data_carriers, 2, 0, 'gray');