function simulate_tx_sig(filename)

    %% Params
    M=4;
    digimod     = PAMmapper(M,0);
    
    fdac = 120e9;
    fsym = 112e9;
    pulseform   = Pulseformer("pulseform","rrc","fdac",fdac,"fsym",fsym,"pulselength",32,"rrcalpha",0.027);
    
    kover = 16;
    awg         = AWG('fdac',fdac,'kover',kover,'lpf_active',1,'f_cutoff',56e9,'lpf_type',filtertypes.gaussian,'bit_resolution',5.5);
    %awg = M8199B();
    
    lp_laser    = Filter('filtdegree',2,"f_cutoff",50e9,"fsamp",fdac*kover,"filterType",filtertypes.butterworth);
    
    %% PROCESS TX
    
    % 1) PRBS Generation
    O = 20; %order of prbs
    N = 2^(O-1); %length of prbs
    [~,seed] = prbs(O,1); %initialize first seed of prbs
    for i = 1:log2(M)
        [bitpattern(:,i),seed] = prbs(O,N,seed);
    end
    
    % 2 ) Build Inf. signal class
    bits = Informationsignal(bitpattern);
    
    % 3) Digi modulation -> PAM-M signal
    digimod_out = digimod.map(bits);
    
    % 4) Pulse shaping -> racos
    X = pulseform.process(digimod_out);
    
    % 5) AWG (lowpass, quantization, sample and hold)
    X = awg.process(X);
    
    % 6) Lowpass behavior before laser
    X = lp_laser.process(X);
    
    % 7) Normalize signal
    X = X.normalize("mode","oneone");
    X.signal = X.signal;
    
    spectrum_plot(X.signal',X.fs,'spectrum');
    
    if nargin == 1
        save(['C:\Users\Silas\Documents\MATLAB\imdd_simulation\projects\',char(filename)],'X');
    end

end