function showEQNoiseSNR(tx_signal, rx_signal, options)
arguments
    tx_signal
    rx_signal 
    options.fs_tx
    options.fs_rx
    options.fignum (1,1) double = NaN % Default to NaN if not provided
    options.displayname (1,:) char = '' % Default to an empty string if not provided
    options.color = [0.2157    0.4941    0.7216];
end

    % Determine the figure number to use or create a new figure
    if isnan(options.fignum)
        fig = figure; % Create a new figure and get its handle
    else
        fig = figure(options.fignum); % Use the specified figure number
    end

    if isa(tx_signal,'Signal')
        options.fs_tx = tx_signal.fs;
        tx_signal = tx_signal.signal;
    end
    if isa(rx_signal,'Signal')
        options.fs_rx = rx_signal.fs;
        rx_signal = rx_signal.signal;
    end


    hold on
    ax = gca;

    % N = numel(ax.Children);
    N = sum(arrayfun(@(x) strcmp(x.LineStyle, '-'), ax.Children));
    cmap = linspecer(8);
    options.color = cmap(mod(N, size(cmap, 1)) + 1, :);

    % Ensure the figure is ready before calling spectrum
    title('SNR of received Signal')

    fft_length = 2^(nextpow2(length(tx_signal))-7);
    
    [s_lin,w] = pwelch(tx_signal,hanning(fft_length),fft_length/2,fft_length,options.fs_tx,"centered","psd","mean");
    [n_lin,w] = pwelch(rx_signal,hanning(fft_length),fft_length/2,fft_length,options.fs_rx,"centered","psd","mean");

    w = w.*1e-9;
    snr_dbm = 10*log10(s_lin./n_lin);

    % figure(231)
    hold on
    plot(w,snr_dbm,'DisplayName','SNR','LineWidth',0.5,'Color',options.color);
    xlabel("Frequency in GHz");

    edgetick = 2^(nextpow2(options.fs_tx*1e-9));
    ticks = -edgetick:16:edgetick;
    xticks(ticks);

    [~,b]=min(abs((-edgetick:16:edgetick)-max(w)));
    xlim([-ticks(b+1) ticks(b+1)]);
    
    max_snr = ceil(max(snr_dbm)/10)*10;
    min_snr = floor(min(snr_dbm)/10)*10;
    ylim([min_snr,max_snr]);
    yticks(-200:10:100);

    grid on; grid minor;
    legend('Interpreter','none');
    title('Noise of soft decision signal (not MLSE)');


end