71 lines
2.0 KiB
Matlab
71 lines
2.0 KiB
Matlab
function showEQNoiseSNR(tx_signal, rx_signal, options)
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arguments
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tx_signal
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rx_signal
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options.fs_tx
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options.fs_rx
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options.fignum (1,1) double = NaN % Default to NaN if not provided
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options.displayname (1,:) char = '' % Default to an empty string if not provided
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options.color = [0.2157 0.4941 0.7216];
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end
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% Determine the figure number to use or create a new figure
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if isnan(options.fignum)
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fig = figure; % Create a new figure and get its handle
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else
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fig = figure(options.fignum); % Use the specified figure number
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end
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if isa(tx_signal,'Signal')
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options.fs_tx = tx_signal.fs;
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tx_signal = tx_signal.signal;
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end
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if isa(rx_signal,'Signal')
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options.fs_rx = rx_signal.fs;
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rx_signal = rx_signal.signal;
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end
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hold on
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ax = gca;
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% N = numel(ax.Children);
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N = sum(arrayfun(@(x) strcmp(x.LineStyle, '-'), ax.Children));
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cmap = linspecer(8);
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options.color = cmap(mod(N, size(cmap, 1)) + 1, :);
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% Ensure the figure is ready before calling spectrum
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title('SNR of received Signal')
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fft_length = 2^(nextpow2(length(tx_signal))-7);
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[s_lin,w] = pwelch(tx_signal,hanning(fft_length),fft_length/2,fft_length,options.fs_tx,"centered","psd","mean");
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[n_lin,w] = pwelch(rx_signal,hanning(fft_length),fft_length/2,fft_length,options.fs_rx,"centered","psd","mean");
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w = w.*1e-9;
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snr_dbm = 10*log10(s_lin./n_lin);
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% figure(231)
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hold on
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plot(w,snr_dbm,'DisplayName','SNR','LineWidth',0.5,'Color',options.color);
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xlabel("Frequency in GHz");
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edgetick = 2^(nextpow2(options.fs_tx*1e-9));
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ticks = -edgetick:16:edgetick;
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xticks(ticks);
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[~,b]=min(abs((-edgetick:16:edgetick)-max(w)));
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xlim([-ticks(b+1) ticks(b+1)]);
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max_snr = ceil(max(snr_dbm)/10)*10;
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min_snr = floor(min(snr_dbm)/10)*10;
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ylim([min_snr,max_snr]);
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yticks(-200:10:100);
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grid on; grid minor;
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legend('Interpreter','none');
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title('Noise of soft decision signal (not MLSE)');
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end
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