measure = 0;


if measure
    freqresp = ChannelFreqResp("Nacq",1024,"Navg",64,"Ncp",70,"f_ref",256e9);
    % 
    Digi_sig = freqresp.buildOFDM();
else
    [Digi_sig,Symbols,Bits] = PAMsource("fsym",fsym,"M",M,"order",18,"useprbs",0,...
            "fs_out",M8199.fdac,"applyclipping",1,"clipfactor",1.7,"applypulseform",1,"pulseformer",Pform,"randkey",pn_key,"mrds_code",usemrds,"mrds_blocklength",512).process();
end

Digi_sig.spectrum("fignum",1112,"displayname",['Signal']);

maxamp = -1;
El_sig = freqresp.precomp(Digi_sig,"maxampdb",maxamp);

El_sig.spectrum("fignum",1112,"displayname",['maxamp:',num2str(maxamp)]);

El_sig = Filter('filtdegree',2,"f_cutoff",60e9,"fs",256e9,"filterType",filtertypes.butterworth,"active",true).process(El_sig);

if measure
    freqresp.estimate(El_sig,"fileName",'','save',false);
end



El_sig.spectrum("fignum",1112,"displayname",['after filter; maxamp:',num2str(maxamp)]);