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48 lines
1.0 KiB
48 lines
1.0 KiB
% ofdm_demod_c.m
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% David Rowe April 2018
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%
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% Plots data from The C OFDM demodulator ofdm_demod, in similar format to
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% plots from Octave OFDM demodulator ofdm_rx.m
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%
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% Useful for of line analysis of a demod run
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function ofdm_demod_c(filename)
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ofdm_lib;
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more off;
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% init modem
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Ts = 0.018; Tcp = 0.002; Rs = 1/Ts; bps = 2; Nc = 17; Ns = 8;
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states = ofdm_init(bps, Rs, Tcp, Ns, Nc);
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ofdm_load_const;
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states.verbose = 0;
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load(filename);
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figure(1); clf;
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plot(rx_np_log_c,'+');
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mx = 2*max(abs(rx_np_log_c));
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axis([-mx mx -mx mx]);
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title('Scatter');
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figure(2); clf;
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plot(phase_est_pilot_log_c(:,2:Nc),'g+', 'markersize', 5);
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title('Phase Est');
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axis([1 length(phase_est_pilot_log_c) -pi pi]);
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figure(3); clf;
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stem(timing_est_log_c)
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title('Timing Est');
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figure(4); clf;
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plot(foff_hz_log_c)
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mx = max(abs(foff_hz_log_c))+1;
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axis([1 max(length(foff_hz_log_c),2) -mx mx]);
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title('Fine Freq');
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ylabel('Hz')
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figure(5); clf;
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plot(snr_est_log_c);
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ylabel('SNR (dB)')
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title('SNR Estimates')
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endfunction
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