Strengthen WDM and IM/DD optical tests
This commit is contained in:
Silas Oettinghaus
290
Tests/integration/helpers/buildReducedImddWorkflow.m
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290
Tests/integration/helpers/buildReducedImddWorkflow.m
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function workflow = buildReducedImddWorkflow(scenario)
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%BUILDREDUCEDIMDDWORKFLOW Build a reduced deterministic IM/DD workflow.
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%
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% The helper keeps the stage order aligned with the project workflow while
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% allowing tests to switch between representative scenarios:
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% - "minimal": reduced regression baseline
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% - "no-impairment": near-ideal baseline with impairment knobs neutralized
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% - "baseline": reference point for monotonicity checks
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% - "impaired": intentionally degraded variant for monotonicity checks
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arguments
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scenario (1, 1) string = "minimal"
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end
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params = scenarioParameters(scenario);
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workflow = runReducedWorkflow(params, scenario);
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end
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function workflow = runReducedWorkflow(params, scenario)
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% -------------------- TX --------------------
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txPulse = Pulseformer( ...
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"fsym", params.fsym, ...
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"fdac", params.fdac, ...
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"pulse", "rrc", ...
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"pulselength", params.pulseLength, ...
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"alpha", params.rcalpha);
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[digiSig, symbols, txBits] = PAMsource( ...
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"fsym", params.fsym, ...
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"M", params.M, ...
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"order", params.sourceOrder, ...
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"useprbs", false, ...
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"fs_out", params.fdac, ...
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"applyclipping", false, ...
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"applypulseform", true, ...
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"pulseformer", txPulse, ...
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"randkey", params.randomKey, ...
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"duobinary_mode", db_mode.no_db, ...
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"mrds_code", 0).process();
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elSig = AWG( ...
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"fdac", params.fdac, ...
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"f_cutoff", params.fsym, ...
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"lpf_active", params.awgLpfActive, ...
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"kover", params.kover, ...
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"bit_resolution", params.awgBitResolution, ...
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"upsampling_method", params.awgUpsamplingMethod, ...
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"precomp_sinc_rolloff", params.awgPrecompSincRolloff, ...
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"normalize2dac", params.awgNormalize2dac).process(digiSig);
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elSig = elSig.normalize("mode", "oneone");
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elSig = elSig .* params.driverScaling;
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% -------------------- Optical Channel --------------------
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optSigTx = EML( ...
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"mode", eml_mode.im_cosinus, ...
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"power", params.opticalPowerDbm, ...
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"fsimu", elSig.fs, ...
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"lambda", params.laserWavelengthNm, ...
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"bias", params.vbias, ...
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"u_pi", params.uPi, ...
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"linewidth", 0, ...
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"randomkey", params.randomKey + 1, ...
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"alpha", 0).process(elSig);
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optSig = Fiber( ...
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"fsimu", optSigTx.fs, ...
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"fiber_length", params.linkLengthKm, ...
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"alpha", params.fiberAlphaDbPerKm, ...
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"D", 0, ...
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"lambda0", 1310, ...
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"gamma", 0, ...
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"Dslope", 0.07).process(optSigTx);
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rxOptSig = Amplifier( ...
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"amp_mode", "ideal_no_noise", ...
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"gain_mode", "output_power", ...
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"amplification_db", params.ropDbm).process(optSig);
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rxSigAfterPd = Photodiode( ...
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"fsimu", params.fdac * params.kover, ...
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"dark_current", 0, ...
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"responsivity", 1, ...
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"temperature", 20, ...
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"nep", 0, ...
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"randomkey", params.randomKey + 2).process(rxOptSig);
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rxSigFiltered = Filter( ...
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"active", params.rxFilterActive, ...
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"filterType", filtertypes.butterworth, ...
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"f_cutoff", params.rxElectricalBandwidthHz, ...
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"fs", params.fdac * params.kover, ...
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"signal_length", 0, ...
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"filtdegree", 4, ...
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"lowpass", 1).process(rxSigAfterPd);
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scopeLpf = Filter( ...
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"active", params.scopeLpfActive, ...
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"filterType", filtertypes.butterworth, ...
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"f_cutoff", params.scopeBandwidthHz, ...
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"fs", params.fadc, ...
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"signal_length", 0, ...
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"filtdegree", 4, ...
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"lowpass", 1);
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scpeSigPreMf = Scope( ...
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"fsimu", params.fdac * params.kover, ...
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"fadc", params.fadc, ...
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"adcresolution", params.scopeAdcResolution, ...
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"quantbuffer", params.scopeQuantBuffer, ...
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"delay", 0, ...
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"fixed_delay", 0, ...
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"filtertype", filtertypes.butterworth, ...
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"samplingdelay", 0, ...
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"rand_samplingdelay", 0, ...
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"freq_offset", 0, ...
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"samp_jitter", 0, ...
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"block_dc", 1, ...
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"lpf_active", params.scopeLpfActive, ...
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"H_lpf", scopeLpf).process(rxSigFiltered);
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rxMatchedFilter = Pulseformer( ...
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"fsym", params.fsym, ...
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"fdac", 2 * params.fsym, ...
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"pulse", "rrc", ...
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"pulselength", params.pulseLength, ...
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"alpha", params.rcalpha, ...
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"matched", 1);
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scpeSig = rxMatchedFilter.process(scpeSigPreMf);
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[syncedSig, ~] = scpeSig.tsynch( ...
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"reference", symbols, ...
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"fs_ref", params.fsym, ...
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"debug_plots", 0);
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syncedCenteredSig = syncedSig - mean(syncedSig.signal);
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syncedSig = syncedCenteredSig;
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syncedSig.signal = syncedSig.signal(1 : 2 * length(symbols));
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% -------------------- DSP --------------------
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ffeEq = FFE( ...
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"epochs_tr", 2, ...
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"epochs_dd", 1, ...
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"len_tr", params.lenTr, ...
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"mu_dd", 1e-4, ...
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"mu_tr", 1e-2, ...
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"order", 21, ...
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"sps", 2, ...
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"decide", 0, ...
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"adaption_technique", adaption_method.nlms, ...
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"dd_mode", 1);
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ffeResults = ffe( ...
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ffeEq, ...
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params.M, ...
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syncedSig, ...
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symbols, ...
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txBits, ...
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"precode_mode", db_mode.no_db, ...
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"showAnalysis", 0, ...
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"postFFE", [], ...
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"eth_style_symbol_mapping", 0);
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mlseEq = FFE( ...
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"epochs_tr", 2, ...
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"epochs_dd", 1, ...
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"len_tr", params.lenTr, ...
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"mu_dd", 1e-4, ...
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"mu_tr", 1e-2, ...
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"order", 21, ...
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"sps", 2, ...
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"decide", 0, ...
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"adaption_technique", adaption_method.nlms, ...
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"dd_mode", 1);
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postfilter = Postfilter("ncoeff", 1, "useBurg", 1);
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mlse = MLSE( ...
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"duobinary_output", 0, ...
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"M", params.M, ...
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"trellis_states", PAMmapper(params.M, 0).levels);
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[vnleResults, mlseResults] = vnle_postfilter_mlse( ...
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mlseEq, ...
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postfilter, ...
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mlse, ...
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params.M, ...
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syncedSig, ...
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symbols, ...
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txBits, ...
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"precode_mode", db_mode.no_db, ...
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"showAnalysis", 0, ...
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"postFFE", [], ...
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"eth_style_symbol_mapping", 0);
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workflow = struct();
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workflow.scenario = scenario;
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workflow.params = params;
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workflow.Digi_sig = digiSig;
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workflow.Symbols = symbols;
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workflow.Tx_bits = txBits;
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workflow.El_sig = elSig;
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workflow.Opt_sig_tx = optSigTx;
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workflow.Opt_sig = optSig;
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workflow.Rx_sig_after_pd = rxSigAfterPd;
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workflow.Rx_sig_filtered = rxSigFiltered;
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workflow.Scpe_sig_pre_mf = scpeSigPreMf;
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workflow.Scpe_sig = scpeSig;
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workflow.Synced_sig_centered = syncedCenteredSig;
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workflow.Synced_sig = syncedSig;
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workflow.ffe_results = ffeResults;
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workflow.vnle_results = vnleResults;
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workflow.mlse_results = mlseResults;
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end
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function params = scenarioParameters(scenario)
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params = commonParameters();
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switch lower(string(scenario))
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case "minimal"
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params.ropDbm = 0;
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params.rxElectricalBandwidthHz = 40e9;
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params.scopeBandwidthHz = 25e9;
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case "no-impairment"
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params.randomKey = 11;
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params.linkLengthKm = 0;
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params.fiberAlphaDbPerKm = 0;
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params.ropDbm = 3;
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params.rxElectricalBandwidthHz = 200e9;
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params.scopeBandwidthHz = 200e9;
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params.rxFilterActive = false;
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params.scopeLpfActive = false;
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params.scopeAdcResolution = 24;
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params.scopeQuantBuffer = 0.05;
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params.awgLpfActive = false;
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params.awgBitResolution = 12;
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params.awgUpsamplingMethod = upsampling_mode.resample;
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params.awgNormalize2dac = true;
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case "baseline"
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params.ropDbm = 0;
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params.rxElectricalBandwidthHz = 40e9;
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params.scopeBandwidthHz = 25e9;
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case "impaired"
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params.ropDbm = -15;
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params.rxElectricalBandwidthHz = 12e9;
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params.scopeBandwidthHz = 12e9;
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otherwise
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error("buildReducedImddWorkflow:UnknownScenario", ...
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"Unknown reduced IM/DD scenario '%s'.", scenario);
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end
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end
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function params = commonParameters()
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params = struct();
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params.M = 4;
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params.fsym = 16e9;
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params.fdac = 64e9;
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params.fadc = 64e9;
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params.kover = 2;
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params.randomKey = 1;
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params.sourceOrder = 12;
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params.rcalpha = 0.05;
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params.pulseLength = 12;
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params.lenTr = 256;
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params.uPi = 3;
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params.vbiasRel = 0.5;
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params.vbias = -params.vbiasRel * params.uPi;
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params.driverScaling = 0.6 * (params.uPi / 2 - abs(params.vbias - params.uPi / 2));
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params.laserWavelengthNm = 1293;
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params.opticalPowerDbm = 3;
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params.linkLengthKm = 1;
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params.fiberAlphaDbPerKm = 0.3;
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params.ropDbm = 0;
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params.rxElectricalBandwidthHz = 40e9;
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params.scopeBandwidthHz = 25e9;
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params.rxFilterActive = true;
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params.scopeLpfActive = true;
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params.scopeAdcResolution = 8;
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params.scopeQuantBuffer = 0.1;
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params.awgLpfActive = false;
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params.awgBitResolution = 8;
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params.awgUpsamplingMethod = upsampling_mode.samplehold;
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params.awgPrecompSincRolloff = 1;
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params.awgNormalize2dac = false;
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end
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