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Add PAMmapper bit mapping and Gray penalty visualization

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This commit is contained in:
Silas Oettinghaus
2026-03-26 16:04:30 +01:00
parent c135cb76b1
commit 10a205f231
7 changed files with 180 additions and 36 deletions
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54
projects/IMDD_base_system/imdd_model.m
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@@ -12,11 +12,12 @@ end
%%% Run parameters
% TX
M = 4;
fsym = 180e9;
fsym = 150e9;
bitrate = [];
apply_pulsef = 1;
fdac = 256e9;
fadc = 256e9;
apply_pulsef = 0;
fdac = 4*fsym;%256e9;
fadc = 4*fsym;%256e9;
random_key = 1;
rcalpha = 0.05;
@@ -28,7 +29,7 @@ vbias = -vbias_rel*u_pi;
laser_wavelength = 1293;
laser_linewidth = 0;
tx_bw_nyquist = 0.8;
tx_bw_nyquist = 0.65;
% Channel
link_length = 1;
@@ -38,7 +39,7 @@ channel_alpha = 0;
channel_delay_symbols = 1;
% RX
rop = -8;
rop = 2;
rx_bw_nyquist = 0.8;
vnle_order1 = 50;
@@ -68,7 +69,7 @@ dfe_ = sum(dfe_order)>0;
duob_mode = db_mode.no_db;
decoding_mode = [];
bitrate = fsym * log2(M);
providedFields = string.empty;
%%% change specific parameter if given in varargin
% Parse optional input arguments
@@ -76,28 +77,38 @@ if ~isempty(varargin)
var_s = varargin{1};
if isstruct(var_s)
fields = fieldnames(var_s);
providedFields = string(fields);
for i = 1:numel(fields)
if isnumeric(fields{i})
eval([fields{i}, ' = ', num2str( var_s.(fields{i}) ), ';']);
fprintf("%s <-- %.2f \n", fields{i}, var_s.(fields{i}));
else
eval([fields{i}, ' = ', 'var_s.(fields{',num2str(i),'})' , ';']);
fieldName = fields{i};
if ~isvarname(fieldName)
error('Invalid parameter name "%s".', fieldName);
end
eval([fieldName, ' = var_s.(fieldName);']);
end
else
error('Optional variables should be passed as a struct.');
end
end
hasFsym = any(providedFields == "fsym");
hasBitrate = any(providedFields == "bitrate");
fsym_ = floor( bitrate*1e-9./log2(M) ).*1e9;
if fsym_ ~= fsym
fsym = fsym_;
% fprintf('Adapted symbolrate to %d GBd, to match provided bitrate of %d GBit/s using PAM %d \n',fsym.*1e-9,bitrate.*1e-9, M);
if M == 6
bitsPerSymbol = 2.5;
else
bitsPerSymbol = log2(M);
if abs(bitsPerSymbol - round(bitsPerSymbol)) > 1e-12
error('Unsupported PAM order M=%d. Only powers of two and PAM-6 are supported.', M);
end
end
if hasFsym && hasBitrate
error('either bitrate or symbolrate!')
elseif hasBitrate
fsym = bitrate / bitsPerSymbol;
else
bitrate = fsym * bitsPerSymbol;
end
f_nyquist = fsym/2;
@@ -114,7 +125,6 @@ Pform = Pulseformer("fsym",fsym,"fdac",4*fsym,"pulse","rc","pulselength",1
Digi_sig.spectrum("displayname",'Digi Spectrum','fignum',10,'normalizeTo0dB',1);
channel_mode = lower(string(channel_mode));
switch channel_mode
@@ -122,7 +132,7 @@ switch channel_mode
%%%%% AWG
% El_sig = M8199A("kover",kover).process(Digi_sig);
El_sig = AWG("fdac",fdac,"f_cutoff",fsym,"lpf_active",0,"kover",kover,"bit_resolution",12,"upsampling_method","samplehold","precomp_sinc_rolloff",1).process(Digi_sig);
El_sig = AWG("fdac",fdac,"f_cutoff",fsym,"lpf_active",1,"kover",kover,"bit_resolution",12,"upsampling_method","samplehold","precomp_sinc_rolloff",0).process(Digi_sig);
% El_sig.spectrum("displayname",'Digi Spectrum','fignum',100,'normalizeTo0dB',0);
% El_sig = El_sig.setPower(0,"dBm");
@@ -199,7 +209,6 @@ dspParameters.use_vnle_mlse = 1;
dspParameters.use_dbtgt = 0;
dspParameters.use_dbenc = 0;
dspParameters.use_ml_mlse = 0;
dspParameters.showAnalysis = 0;
dspParameters.pf_ncoeffs = pf_ncoeffs;
dspParameters.ffe_order_ffe = [50, 0, 0];
dspParameters.ffe_order_dfe = [50, 0, 0];
@@ -217,7 +226,7 @@ scopeOutput = dsp_scope_signal(Rx_sig, Symbols, Tx_bits, ...
"parameters", dspParameters, ...
"preprocess_mode", "auto", ...
"tx_pulseformer", txPulseformer, ...
"debug_plots", false);
"debug_plots", true);
output = struct();
output.ffe_results = scopeOutput.ffe_package;
@@ -230,3 +239,4 @@ output.mlmlse_results = scopeOutput.mlmlse_package;
disp('- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ')
fprintf('\n')
end