% TX 
    M               = 4;
    fsym            = 180e9;
    f_nyquist       = fsym/2;
    apply_pulsef    = 0;
    fdac            = 2*fsym;%256e9;
    fadc            = 2*fsym;%256e9;
    fdac            = 256e9;
    fadc            = 256e9;
    random_key      = 1;
    db_precode      = 0;
    emulate_precode = 0;
    discard_precode = 0;
    db_encode       = 0;
    % duob_mode       = db_mode.db_emulate;
    emulate_db = 1;
    rcalpha         = 0.05;
    kover           = 16;
    vbias_rel       = 0.5;
    u_pi            = 2.9;
    vbias           = -vbias_rel*u_pi;
    laser_wavelength    = 1310;
    laser_linewidth     = 0;
    tx_bw_nyquist   = 1.5;

% Channel
    link_length     = 1;

% RX
    rop = -8;
    rx_bw_nyquist = 0.7;

% EQ
    eq_mode = equalizer_structure.vnle_pf_mlse;
    ffe_order=[50,0,0];
    vnle_order=[50,7,7];
    dfe_order = [2 0 0];

    len_tr = 4096*2;
    mu_ffe = [0.0004 0.0004 0.0004];
    mu_dfe = 0.0004;
    mu_dc = 0.00;

    dfe_ = sum(dfe_order)>0;