Scattered stuff from Silas during Dissertation
This commit is contained in:
Silas Oettinghaus
257
projects/Diss/investigate_noise_enhancement.m
Normal file
257
projects/Diss/investigate_noise_enhancement.m
Normal file
@@ -0,0 +1,257 @@
|
||||
|
||||
% Minimal IMDD model for investigating FFE noise enhancement.
|
||||
% Parameters mirror the current IMDD_base_system/imdd_it.m,
|
||||
% IMDD_base_system/imdd_model.m, and the FFE branch in dsp_scope_signal.m.
|
||||
|
||||
clearvars;
|
||||
close all;
|
||||
|
||||
%% Sweep parameters from imdd_it.m
|
||||
fsym_values = (152:16:200).*1e9;
|
||||
|
||||
precomp = 0;
|
||||
laser_wavelength = 1310;
|
||||
M = 4;
|
||||
link_length = 2;
|
||||
channel_alpha = 0.5;
|
||||
duob_mode = db_mode.db_precoded;
|
||||
decoding_mode = db_decoder.sequencedetection;
|
||||
channel_mode = channel_model.physical;
|
||||
channel_snr_dB = 20;
|
||||
rop_values = -8:2:4;
|
||||
|
||||
%% Inner model parameters from imdd_model.m
|
||||
bitrate = [];
|
||||
apply_pulsef = 0;
|
||||
fdac = 256e9;
|
||||
fadc = 256e9;
|
||||
random_key = 1;
|
||||
|
||||
rcalpha = 0.05;
|
||||
kover = 16;
|
||||
|
||||
vbias_rel = 0.5;
|
||||
u_pi = 3;
|
||||
vbias = -vbias_rel*u_pi;
|
||||
|
||||
laser_linewidth = 0;
|
||||
eml_alpha = 0;
|
||||
|
||||
len_tr = 4096*2;
|
||||
pf_ncoeffs = 1;
|
||||
mu_dc = 0.005;
|
||||
|
||||
nRates = numel(fsym_values);
|
||||
nRops = numel(rop_values);
|
||||
eq_names = ["FFE","VNLE"];
|
||||
nEqs = numel(eq_names);
|
||||
emptyResult = struct("fsym",[],"ROP",[],"equalizer",[],"BER",[],"SNR",[],"numBitErr",[], ...
|
||||
"eq_noise",[],"eq_signal_sd",[],"eq",[],"Rx_sig",[],"Tx_sig",[],"Tx_symbols",[]);
|
||||
results = repmat(emptyResult,nRates,nRops,nEqs);
|
||||
cols = flip(cbrewer2('RdYlBu',nRates+4));
|
||||
midIdx = floor(size(cols,1)/2) + (-1:2);
|
||||
cols(midIdx,:) = [];
|
||||
|
||||
for i = 1:numel(fsym_values)
|
||||
fsym = fsym_values(i);
|
||||
fprintf("Running %.0f GBd (%d/%d)\n", fsym*1e-9, i, numel(fsym_values));
|
||||
|
||||
if isempty(bitrate)
|
||||
bitrateCurrent = fsym * log2(M);
|
||||
end
|
||||
|
||||
Pform = Pulseformer("fsym",fsym,"fdac",4*fsym,"pulse","rc","pulselength",16,"alpha",rcalpha);
|
||||
[Digi_sig, Symbols, ~] = PAMsource( ...
|
||||
"fsym",fsym,"M",M,"order",18,"useprbs",0, ...
|
||||
"fs_out",fdac, ...
|
||||
"applyclipping",0,"clipfactor",1.5, ...
|
||||
"applypulseform",apply_pulsef,"pulseformer",Pform, ...
|
||||
"randkey",random_key, ...
|
||||
"duobinary_mode",duob_mode, ...
|
||||
"mrds_code",0,"mrds_blocklength",512).process();
|
||||
|
||||
rateResults = repmat(emptyResult,nRops,nEqs);
|
||||
|
||||
|
||||
Tx_sig = Digi_sig;
|
||||
|
||||
El_sig = M8199B("kover",kover).process(Digi_sig);
|
||||
|
||||
tx_bwl = 85e9;
|
||||
El_sig = Filter("filtdegree",4,"f_cutoff",tx_bwl,"fs",fdac*kover, ...
|
||||
"filterType",filtertypes.bessel_inp,"active",true).process(El_sig);
|
||||
|
||||
El_sig = El_sig.normalize("mode","oneone");
|
||||
scaling = 0.7*(u_pi/2-abs(vbias-u_pi/2));
|
||||
El_sig = El_sig .* scaling;
|
||||
|
||||
Opt_sig = EML("mode",eml_mode.im_cosinus,"power",3,"fsimu",El_sig.fs, ...
|
||||
"lambda",laser_wavelength,"bias",vbias,"u_pi",u_pi, ...
|
||||
"linewidth",laser_linewidth,"randomkey",random_key+1, ...
|
||||
"alpha",eml_alpha).process(El_sig);
|
||||
|
||||
Opt_sig = Fiber("fsimu",Opt_sig.fs,"fiber_length",link_length, ...
|
||||
"alpha",0.3,"D",0,"lambda0",1310,"gamma",0,"Dslope",0.07).process(Opt_sig);
|
||||
|
||||
parfor j = 1:nRops
|
||||
rop = rop_values(j);
|
||||
fprintf(" ROP %.1f dBm (%d/%d)\n", rop, j, nRops);
|
||||
|
||||
Rx_sig = Amplifier("amp_mode","ideal_no_noise","gain_mode","output_power", ...
|
||||
"amplification_db",rop).process(Opt_sig);
|
||||
|
||||
Rx_sig = Photodiode("fsimu",fdac*kover,"dark_current",2e-08, ...
|
||||
"responsivity",0.6,"temperature",20,"nep",1.8e-11).process(Rx_sig);
|
||||
|
||||
rx_bwl = 90e9;
|
||||
Rx_sig = Filter("filtdegree",4,"f_cutoff",rx_bwl,"fs",fdac*kover, ...
|
||||
"filterType",filtertypes.butterworth,"active",true).process(Rx_sig);
|
||||
|
||||
Lp_scpe = Filter("filtdegree",4,"f_cutoff",110e9,"fs",fadc, ...
|
||||
"filterType",filtertypes.butterworth,"active",true);
|
||||
|
||||
Rx_sig = Scope("fsimu",fdac*kover,"fadc",fadc, ...
|
||||
"delay",0,"fixed_delay",0,"filtertype",filtertypes.butterworth, ...
|
||||
"samplingdelay",0,"rand_samplingdelay",0,"freq_offset",0, ...
|
||||
"samp_jitter",0,"adcresolution",8,"quantbuffer",0.1, ...
|
||||
"block_dc",1,"lpf_active",1,"H_lpf",Lp_scpe).process(Rx_sig);
|
||||
|
||||
txPulseformer = [];
|
||||
if apply_pulsef
|
||||
txPulseformer = Pform;
|
||||
end
|
||||
|
||||
Scpe_sig = preprocessSignal(Rx_sig, Symbols, fsym, ...
|
||||
"mode","auto", ...
|
||||
"tx_pulseformer",txPulseformer, ...
|
||||
"debug_plots",0);
|
||||
Scpe_sig.signal = Scpe_sig.signal(1:2*Symbols.length);
|
||||
Scpe_sig.signal = real(Scpe_sig.signal);
|
||||
|
||||
for k = 1:nEqs
|
||||
switch eq_names(k)
|
||||
case "FFE"
|
||||
eq_ = FFE("epochs_tr",5,"epochs_dd",5,"len_tr",len_tr, ...
|
||||
"mu_dd",1e-1,"mu_tr",0.4,"order",50, ...
|
||||
"sps",2,"decide",0,"optmize_mus",1,"dd_mode",1, ...
|
||||
"adaption_technique","nlms","mu_dc",1.021e-05);
|
||||
case "VNLE"
|
||||
eq_ = VNLE("epochs_tr",5,"epochs_dd",5,"len_tr",len_tr, ...
|
||||
"mu_dd",[0.0004 0.0005 0.0006],"mu_tr",0, ...
|
||||
"order",[25,2,2],"sps",2,"decide",0, ...
|
||||
"optmize_mus",1,"mu_dc",0.1);
|
||||
end
|
||||
|
||||
[eq_signal_sd, eq_noise] = eq_.process(Scpe_sig, Symbols);
|
||||
|
||||
eq_signal_hd = PAMmapper(M,0).quantize(eq_signal_sd);
|
||||
rx_bits = PAMmapper(M,0).demap(eq_signal_hd);
|
||||
tx_bits_demapped = PAMmapper(M,0).demap(Symbols);
|
||||
[~, errors, ber] = calc_ber(rx_bits.signal, tx_bits_demapped.signal, ...
|
||||
"skip_front",10,"skip_end",10);
|
||||
|
||||
localResult = emptyResult;
|
||||
localResult.fsym = fsym;
|
||||
localResult.ROP = rop;
|
||||
localResult.equalizer = eq_names(k);
|
||||
localResult.BER = ber;
|
||||
localResult.SNR = snr(eq_signal_sd.signal, eq_noise.signal);
|
||||
localResult.numBitErr = errors;
|
||||
localResult.eq_noise = eq_noise;
|
||||
localResult.eq_signal_sd = eq_signal_sd;
|
||||
localResult.eq = eq_;
|
||||
localResult.Rx_sig = Rx_sig;
|
||||
localResult.Tx_sig = Tx_sig;
|
||||
localResult.Tx_symbols = Symbols;
|
||||
rateResults(j,k) = localResult;
|
||||
end
|
||||
end
|
||||
results(i,:,:) = reshape(rateResults,1,nRops,nEqs);
|
||||
|
||||
end
|
||||
|
||||
|
||||
|
||||
|
||||
%% Plot section
|
||||
close all
|
||||
berGrid = reshape([results.BER],nRates,nRops,nEqs);
|
||||
|
||||
figure(400);
|
||||
clf;
|
||||
for k = 1:nEqs
|
||||
subplot(1,nEqs,k);
|
||||
plot(fsym_values.*1e-9, berGrid(:,:,k), "LineWidth",0.8, ...
|
||||
"LineStyle","-","Marker",".","MarkerSize",15);
|
||||
set(gca,"YScale","log");
|
||||
grid on;
|
||||
grid minor;
|
||||
xlabel("Symbol rate (GBd)");
|
||||
ylabel("BER");
|
||||
title(eq_names(k) + " BER vs. Symbol Rate");
|
||||
legend(compose("ROP %.1f dBm",rop_values),"Location","best");
|
||||
end
|
||||
|
||||
%%
|
||||
figure(500);
|
||||
clf;
|
||||
for k = 1:nEqs
|
||||
subplot(1,nEqs,k);
|
||||
plot(rop_values, berGrid(:,:,k).', "LineWidth",0.8, ...
|
||||
"LineStyle","-","Marker",".","MarkerSize",15);
|
||||
set(gca,"YScale","log");
|
||||
grid on;
|
||||
grid minor;
|
||||
xlabel("ROP");
|
||||
ylabel("BER");
|
||||
title(eq_names(k) + " BER vs. ROP");
|
||||
legend(compose("%.0f GBd",fsym_values.*1e-9),"Location","best");
|
||||
end
|
||||
|
||||
%%
|
||||
plotResults = reshape(results(:,end,:),nRates,nEqs);
|
||||
for k = 1:nEqs
|
||||
for i = 1:nRates
|
||||
fsym = plotResults(i,k).fsym;
|
||||
eq_noise = plotResults(i,k).eq_noise;
|
||||
eq_signal_sd = plotResults(i,k).eq_signal_sd;
|
||||
Rx_sig = plotResults(i,k).Rx_sig;
|
||||
Tx_sig = plotResults(i,k).Tx_sig;
|
||||
Tx_symbols = plotResults(i,k).Tx_symbols;
|
||||
displayName = sprintf('%s, %d GBd, ROP %.1f dBm',plotResults(i,k).equalizer,fsym.*1e-9,plotResults(i,k).ROP);
|
||||
|
||||
showEQNoisePSD(eq_noise, "fignum", 1, "displayname", displayName,"color",cols(i,:));
|
||||
xlim([0, 120])
|
||||
% mat2tikz_improved("C:/Users/Silas/Documents/6971e0b65b380ca6d71c837f/03_DSP_Techniques/tikz/ffe_noise_enhancement/noise_psd.tex")
|
||||
|
||||
Tx_sig.normalize("mode","rms").spectrum("displayname",displayName,'fignum',2,'normalizeTo0dB',0,"color",cols(i,:),"linestyle",'-','HandleVisibility','on');
|
||||
xlim([0, 120])
|
||||
% mat2tikz_improved("C:/Users/Silas/Documents/6971e0b65b380ca6d71c837f/03_DSP_Techniques/tikz/ffe_noise_enhancement/tx_signals.tex")
|
||||
|
||||
Rx_sig.normalize("mode","rms").spectrum("displayname",displayName,'fignum',3,'normalizeTo0dB',0,"color",cols(i,:));
|
||||
xlim([0, 120])
|
||||
% mat2tikz_improved("C:/Users/Silas/Documents/6971e0b65b380ca6d71c837f/03_DSP_Techniques/tikz/ffe_noise_enhancement/rx_signals.tex")
|
||||
|
||||
showEQNoiseSNR(eq_signal_sd, eq_noise,"displayname",displayName,"color",cols(i,:),"fignum",4);
|
||||
xlim([0, 120])
|
||||
% mat2tikz_improved("C:/Users/Silas/Documents/6971e0b65b380ca6d71c837f/03_DSP_Techniques/tikz/ffe_noise_enhancement/snr_after_ffe.tex")
|
||||
|
||||
% showEQfilter(plotResults(i,k).eq.e, eq_signal_sd.fs.*2,"displayname",displayName,'fignum',5,"color",cols(i,:));
|
||||
% xlim([0, 120]);
|
||||
|
||||
fprintf('%s BER %.2e \n',plotResults(i,k).equalizer,plotResults(i,k).BER)
|
||||
|
||||
if i == 1 || i == nRates-1 || i == nRates
|
||||
show2Dconstellation(PAMmapper(M,0).get_scaling.*eq_signal_sd.signal(1:end), PAMmapper(M,0).get_scaling.*Tx_symbols.signal(1:end), ...
|
||||
"displayname",displayName, ...
|
||||
"fignum",5+(k-1)*nRates+i, ...
|
||||
"clear",i == 1 && k == 1,"rasterize", false);
|
||||
mat2tikz_improved(sprintf("C:/Users/Silas/Documents/6971e0b65b380ca6d71c837f/03_DSP_Techniques/tikz/ffe_noise_enhancement/noise_correlation_%s.tex",displayName),"cleanfigure",true);
|
||||
eq_signal_sd.eye(fsym,M,"fignum",8+(k-1)*nRates+i,"mode",1);
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
%%
|
||||
|
||||
|
||||
Reference in New Issue
Block a user