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