Begin with High Speed Measurement
This commit is contained in:
Silas Labor Zizou
258
projects/HighSpeedExperiment_2024/bias_optimization.m
Normal file
258
projects/HighSpeedExperiment_2024/bias_optimization.m
Normal file
@@ -0,0 +1,258 @@
|
||||
|
||||
folderpath = 'C:\Users\sioe\Documents\High_Speed_Measurement_2024\bias_testing\';
|
||||
experiment_name = 'PAM4_b2b_';
|
||||
|
||||
ffe_only = 0;
|
||||
postfilter_approach = 1;
|
||||
db_channel_approach = 0;
|
||||
db_coding_approach = 0;
|
||||
|
||||
db_precode = db_coding_approach || db_channel_approach;
|
||||
|
||||
%%% SIR Sweep for MPI Experiment %%%
|
||||
params = struct;
|
||||
|
||||
params.vbias = [3];
|
||||
params.awg_vpp = [2.7];
|
||||
|
||||
wh = DataStorage(params);
|
||||
|
||||
wh.addStorage("ber");
|
||||
wh.addStorage("pd_in");
|
||||
wh.addStorage("rop");
|
||||
wh.addStorage("m");
|
||||
wh.addStorage("signals");
|
||||
|
||||
precomp_path = "C:\Users\sioe\Documents\High_Speed_Measurement_2024\precomp\";
|
||||
precomp_fn = "lab_high_speed";
|
||||
precomp_mode = 2; %0=do nothing ; 1= measure; 2=precomp active
|
||||
precomp_amp_max = 4;
|
||||
|
||||
M = 4;
|
||||
pn_key = 2;
|
||||
usemrds = 0;
|
||||
fsym = 170e9;
|
||||
fdac = 256e9;
|
||||
awg_vpp = 0.35;
|
||||
fadc = 256e9;
|
||||
rrcalpha = 0.05;
|
||||
v_bias = 2.25;
|
||||
pd_in_set = 6;
|
||||
rop_atten = 0;
|
||||
|
||||
looptatal = prod(wh.dim);
|
||||
disp(['Start Measurement of ',num2str(looptatal),' loops...'])
|
||||
hWaitbar = waitbar(0, 'Starting measurement...', 'Name', 'Processing Progress');
|
||||
loopcnt = 0;
|
||||
|
||||
for v_bias = wh.parameter.vbias.values
|
||||
for awg_vpp = wh.parameter.awg_vpp.values
|
||||
|
||||
loopcnt = loopcnt+1;
|
||||
progressFraction = loopcnt / looptatal;
|
||||
waitbar(progressFraction, hWaitbar, ...
|
||||
sprintf('Progress: %d/%d', loopcnt, looptatal));
|
||||
|
||||
loop_name = ['_fsym_',num2str(fsym)];
|
||||
|
||||
%%%%% SET Voltages %%%%%%
|
||||
dcs = DC_supply("active",[1,0],"voltage",[v_bias, 0]);
|
||||
dcs.set("voltage",[v_bias, 0]);
|
||||
|
||||
%%%%% SET Attenuator %%%%%%
|
||||
voa = OptAtten("active",[1,2,1,1],"value",[rop_atten,pd_in_set,0,0],"wavelength",[1310,1310,1310,1310]);
|
||||
voa.set('active',[1,2,1,1],'value',[rop_atten,pd_in_set,0,0]);
|
||||
% voa.readvals();
|
||||
|
||||
%%%%% Construct AWG and Scope Modules %%%%%%
|
||||
SCP = ScopeKeysight("model","UXR1104B",'autoscale',0,"fadc","GSa_256","channel",[0,1,0,0],"recordLen",2000000,"removeDC",1);
|
||||
AWG = AwgKeysight("model","M8199B","fdac",fdac,"scaletodac",[1,1],"skews",[0,0],"voltages",[0,awg_vpp]);
|
||||
A2S = Awg2Scope(AWG,SCP,[0,2,0,0]);
|
||||
|
||||
%%%%% Symbol Generation %%%%%%
|
||||
Pform = Pulseformer("fsym",fsym,"fdac",4*fsym,"pulse","rrc","pulselength",16,"rrcalpha",rrcalpha);
|
||||
|
||||
[Digi_sig,Symbols,Bits] = PAMsource("fsym",fsym,"M",M,"order",18,"useprbs",1,...
|
||||
"fs_out",fdac,"applyclipping",0,"clipfactor",1.7,...
|
||||
"applypulseform",0,"pulseformer",Pform,"randkey",pn_key,...
|
||||
"db_precode",db_precode,...
|
||||
"mrds_code",usemrds,"mrds_blocklength",512,"db_encode",db_coding_approach).process();
|
||||
|
||||
%%%%% Precompensation Routine %%%%%%
|
||||
if precomp_mode == 1 % measure channel
|
||||
precomp_est = ChannelFreqResp("Nacq",1024,"Navg",64,"Ncp",63,'f_ref',fdac);
|
||||
Digi_sig = precomp_est.buildOFDM();
|
||||
elseif precomp_mode == 2 % apply precomp
|
||||
precomp_est = ChannelFreqResp("Nacq",1024,"Navg",64,"Ncp",63,'f_ref',Digi_sig.fs);
|
||||
Digi_sig = precomp_est.precomp(Digi_sig,'maxampdb',precomp_amp_max,'loadPath',precomp_path,'fileName',precomp_fn);
|
||||
end
|
||||
|
||||
%%%%% Resample to DAC rate %%%%%%
|
||||
Digi_sig = Digi_sig.resample("fs_out",AWG.fdac);
|
||||
|
||||
|
||||
%%%%% Plot and Save Routine 1 %%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
% Digi_sig.spectrum("displayname","Normal Tx","fignum",10);
|
||||
|
||||
% save([folderpath,[experiment_name,'bits'],loop_name],"Bits");
|
||||
% save([folderpath,[experiment_name,'symbols'],loop_name],"Symbols");
|
||||
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
|
||||
%%%%% AWG --> Scope %%%%%%
|
||||
[~,Scpe_sig,~,D] = A2S.process("signal2",Digi_sig);
|
||||
|
||||
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
% Scpe_sig.spectrum("displayname","Scope PSD","fignum",20);
|
||||
|
||||
% Scpe_sig.plot("displayname","Scope raw signal","fignum",25);
|
||||
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
|
||||
|
||||
%%%%%% Sample to 2x fsym %%%%%%
|
||||
Scpe_sig = Scpe_sig.resample("fs_in",fadc,"fs_out",2*fsym);
|
||||
|
||||
%%%%% Precompensation Routine %%%%%%
|
||||
if precomp_mode == 1
|
||||
precomp_est.estimate(Scpe_sig,"save",true,"savePath",precomp_path,"fileName",precomp_fn);
|
||||
precomp_est.plot();
|
||||
end
|
||||
|
||||
voa.readvals();
|
||||
rop = voa.power_state(1);
|
||||
pd_in = voa.power_state(2);
|
||||
disp(['ROP: ',num2str(rop),' dBm || PD in: ',num2str(pd_in), ' dBm']);
|
||||
|
||||
%%%%%% Sync Rx signal with reference %%%%%%
|
||||
[Scpe_sig,S] = Scpe_sig.tsynch("reference",Symbols,"fs_ref",fsym);
|
||||
|
||||
%%%%%% SNR CHEAT - Avg. the measured signal occurences %%%%%%
|
||||
average_signals = 0;
|
||||
if average_signals
|
||||
scope_mean = zeros(size(S{1}.signal));
|
||||
for n=1:numel(S)
|
||||
scope_mean = scope_mean + S{n}.signal;
|
||||
end
|
||||
scope_mean = scope_mean ./ n;
|
||||
Scpe_sig.signal = scope_mean;
|
||||
end
|
||||
|
||||
%%%%% Plot and Save Routine 2 %%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
save([folderpath,experiment_name,'rx_signal',loop_name],"S");
|
||||
Scpe_sig.eye(fsym,M,"fignum",40,"displayname",' after Scope');
|
||||
|
||||
voa.readvals();
|
||||
rop = voa.power_state(1);
|
||||
pd_in = voa.power_state(2);
|
||||
|
||||
%%%%% EQUALIZE %%%%%%
|
||||
Eq = FFE("epochs_tr",5,"epochs_dd",5,"len_tr",4096*2,"mu_dd",1e-4,"mu_tr",0,"order",50,"sps",2,"decide",0);
|
||||
% Eq = VNLE("epochs_tr",5,"epochs_dd",5,"len_tr",4096*2,"mu_dd",[0.0004 0.0005 0.0006],"mu_tr",0,"order",[50,7,7],"sps",2,"decide",1);
|
||||
% Eq = EQ("Ne",[50,7,7],"Nb",[0,0,0],"training_length",4096*2,"training_loops",5,"dd_loops",5,"K",2,"DCmu",0.05,"DDmu",[0.0004 0.0004 0.0004 0.0004 ],"DFEmu",0.005,"FFEmu",0,"plotfinal",0,"ideal_dfe",1);
|
||||
|
||||
if ffe_only %%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
|
||||
[EQ_sig] = Eq.process(Scpe_sig,Symbols);
|
||||
|
||||
EQ_sig.plot("fignum",50,"displayname",'After EQ');
|
||||
|
||||
Rx_bits = PAMmapper(M,0).demap(EQ_sig);
|
||||
|
||||
[~,errors_bm,ber,errors] = calc_ber(Rx_bits.signal,Bits.signal,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
|
||||
|
||||
disp(['FFE: ',sprintf('%.1E',ber),'| ROP: ',num2str(rop),' dB | PD_in: ',num2str(pd_in),' dBm']);
|
||||
|
||||
if 1
|
||||
figure(53);
|
||||
constellation = unique(Symbols.signal);
|
||||
received = NaN(numel(constellation),length(Symbols));
|
||||
for lvl = 1:numel(constellation)
|
||||
received(lvl,Symbols.signal==constellation(lvl)) = EQ_sig.signal(Symbols.signal==constellation(lvl));
|
||||
hold on
|
||||
histogram(received(lvl,:),1000,"EdgeAlpha",0);
|
||||
end
|
||||
end
|
||||
|
||||
elseif postfilter_approach %%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
|
||||
[EQ_sig] = Eq.process(Scpe_sig,Symbols);
|
||||
|
||||
EQ_sig.plot("fignum",50,"displayname",'After EQ','clear',1);
|
||||
|
||||
Noi = EQ_sig-Symbols;
|
||||
|
||||
Rx_bits = PAMmapper(M,0).demap(EQ_sig);
|
||||
|
||||
[~,errors_bm,ber_ffe_only,errors] = calc_ber(Rx_bits.signal,Bits.signal,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
|
||||
|
||||
nc = 3;
|
||||
burg_coeff = arburg(Noi.signal,nc);
|
||||
|
||||
EQ_sig = EQ_sig.filter(burg_coeff,1);
|
||||
|
||||
if 0
|
||||
Noi.spectrum('displayname','Noise PSD','fignum',123)
|
||||
[h,w] = freqz(1,burg_coeff,length(Noi),"whole",Noi.fs);
|
||||
h = h/max(abs(h));
|
||||
hold on
|
||||
w_ = (w - Noi.fs/2);
|
||||
plot(w_.*1e-9,20*log10(fftshift(h)),'DisplayName',['', num2str(nc), ' coefficients for burg alg.']);
|
||||
end
|
||||
|
||||
EQ_sig = MLSE("DIR",burg_coeff,"duobinary_output",0,"M",M,"trellis_states",PAMmapper(M,0).levels).process(EQ_sig);
|
||||
|
||||
Rx_bits = PAMmapper(M,0).demap(EQ_sig);
|
||||
|
||||
[~,errors_bm,ber,errors] = calc_ber(Rx_bits.signal,Bits.signal,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
|
||||
|
||||
disp(['FFE: ',sprintf('%.1E',ber_ffe_only),' -> PF -> MLSE: ',sprintf('%.1E',ber),' dB | PD_in: ',num2str(pd_in),' dBm']);
|
||||
|
||||
elseif db_channel_approach %%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
|
||||
[EQ_sig, Noi] = Eq.process(Scpe_sig,Duobinary().encode(Symbols));
|
||||
|
||||
EQ_sig.plot("fignum",50,"displayname",'After EQ','clear',1);
|
||||
|
||||
EQ_sig = MLSE("DIR",[1,1],"duobinary_output",1,"M",M,"trellis_states",PAMmapper(M,0).levels).process(EQ_sig);
|
||||
|
||||
EQ_sig = Duobinary().decode(EQ_sig);
|
||||
|
||||
Rx_bits = PAMmapper(M,0).demap(EQ_sig);
|
||||
[~,errors_bm,ber,errors] = calc_ber(Rx_bits.signal,Bits.signal,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
|
||||
|
||||
disp([' DB Precode -> Channel -> FFE -> Decode/ Mod ',sprintf('%.1E',ber),' | PD_in: ',num2str(pd_in),' dBm']);
|
||||
|
||||
elseif db_coding_approach %%%%%%%%%%%%%%%%%%%%%%%%%%%
|
||||
|
||||
[EQ_sig, Noi] = Eq.process(Scpe_sig,Symbols);
|
||||
EQ_sig = MLSE("DIR",[1,1],"duobinary_output",1,"M",M,"trellis_states",PAMmapper(M,0).levels).process(EQ_sig);
|
||||
EQ_sig = Duobinary().decode(EQ_sig);
|
||||
|
||||
Rx_bits = PAMmapper(M,0).demap(EQ_sig);
|
||||
[~,errors_bm,ber,errors] = calc_ber(Rx_bits.signal,Bits.signal,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
|
||||
|
||||
EQ_sig.plot("fignum",50,"displayname",'After EQ');
|
||||
|
||||
disp([' DB Precode -> DB Code -> Channel -> FFE -> Decode/ Mod ',sprintf('%.1E',ber),' | PD_in: ',num2str(pd_in),' dBm']);
|
||||
|
||||
end
|
||||
|
||||
|
||||
wh.addValueToStorage(ber,'ber',v_bias,awg_vpp);
|
||||
wh.addValueToStorage(rop,'rop',v_bias,awg_vpp);
|
||||
wh.addValueToStorage(pd_in,'pd_in',v_bias,awg_vpp);
|
||||
wh.addValueToStorage(Rx_bits,'signals',v_bias,awg_vpp);
|
||||
wh.addValueToStorage(M,'m',v_bias,awg_vpp);
|
||||
|
||||
showCurrentMeasurement('BER', ber, 'ROP', rop, 'PD in', pd_in, 'PAM',M, 'Vbias', v_bias, 'AWG Vpp', awg_vpp, 'Precomp MaxAmp',precomp_amp_max);
|
||||
autoArrangeFigures(3,3,2);
|
||||
|
||||
|
||||
end
|
||||
end
|
||||
|
||||
close(hWaitbar);
|
||||
|
||||
wh.save([folderpath,experiment_name,'_wh']);
|
||||
|
||||
autoArrangeFigures(3,3,2)
|
||||
|
||||
Reference in New Issue
Block a user