Add AWGN channel models and route IMDD simulation through them
This commit is contained in:
Silas Oettinghaus
@@ -32,6 +32,10 @@ tx_bw_nyquist = 0.8;
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% Channel
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link_length = 1;
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channel_mode = "physical";
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channel_snr_dB = 20;
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channel_alpha = 0;
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channel_delay_symbols = 1;
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% RX
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rop = -8;
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@@ -46,7 +50,7 @@ dfe_order = [0 0 0];
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pf_ncoeffs = 1;
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alpha = 0;
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eml_alpha = 0;
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len_tr = 4096*2;
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@@ -95,15 +99,12 @@ if fsym_ ~= fsym
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end
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f_nyquist = fsym/2;
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Pform = Pulseformer("fsym",fsym,"fdac",4*fsym,"pulse","rc","pulselength",16,"alpha",rcalpha);
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[Digi_sig,Symbols,Tx_bits] = PAMsource(...
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"fsym",fsym,"M",M,"order",18,"useprbs",0,...
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"fsym",fsym,"M",M,"order",16,"useprbs",0,...
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"fs_out",fdac,...
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"applyclipping",0,"clipfactor",1.5,...
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"applypulseform",apply_pulsef,"pulseformer",Pform,...
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@@ -113,52 +114,74 @@ Pform = Pulseformer("fsym",fsym,"fdac",4*fsym,"pulse","rc","pulselength",1
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Digi_sig.spectrum("displayname",'Digi Spectrum','fignum',10,'normalizeTo0dB',1);
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%%%%% AWG
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% El_sig = M8199A("kover",kover).process(Digi_sig);
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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);
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% El_sig.spectrum("displayname",'Digi Spectrum','fignum',100,'normalizeTo0dB',0);
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% El_sig = El_sig.setPower(0,"dBm");
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%%%%% Low-pass el. components %%%%%%
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tx_bwl = tx_bw_nyquist.*f_nyquist;
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% tx_bwl = 80e9;
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El_sig = Filter('filtdegree',4,"f_cutoff",tx_bwl,"fs",fdac*kover,"filterType",filtertypes.butterworth,"active",true).process(El_sig);
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% El_sig.spectrum("displayname",'Digi Spectrum','fignum',100,'normalizeTo0dB',1);
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channel_mode = lower(string(channel_mode));
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%%%%% Electrical Driver Amplifier %%%%%%
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% El_sig = Amplifier("amp_mode","ideal_no_noise","gain_mode","gain","amplification_db",3).process(El_sig);
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El_sig = El_sig.normalize("mode","oneone");
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scaling = 0.6*(u_pi/2-abs(vbias-u_pi/2));
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El_sig = El_sig .* scaling;
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switch channel_mode
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case "physical"
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%%%%% MODULATE E/O CONVERSION %%%%%%
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[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",alpha).process(El_sig);
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%%%%% AWG
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% El_sig = M8199A("kover",kover).process(Digi_sig);
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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);
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% El_sig.spectrum("displayname",'Digi Spectrum','fignum',100,'normalizeTo0dB',0);
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% El_sig = El_sig.setPower(0,"dBm");
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% Opt_sig.spectrum("displayname",'Opt Spectrum','fignum',10,'normalizeTo0dB',1);
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%%%%% Low-pass el. components %%%%%%
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tx_bwl = tx_bw_nyquist.*f_nyquist;
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% tx_bwl = 80e9;
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El_sig = Filter('filtdegree',4,"f_cutoff",tx_bwl,"fs",fdac*kover,"filterType",filtertypes.butterworth,"active",true).process(El_sig);
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% El_sig.spectrum("displayname",'Digi Spectrum','fignum',100,'normalizeTo0dB',1);
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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);
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%%%%% Electrical Driver Amplifier %%%%%%
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% El_sig = Amplifier("amp_mode","ideal_no_noise","gain_mode","gain","amplification_db",3).process(El_sig);
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El_sig = El_sig.normalize("mode","oneone");
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scaling = 0.6*(u_pi/2-abs(vbias-u_pi/2));
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El_sig = El_sig .* scaling;
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%%%%%% ROP %%%%%%
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Rx_sig = Amplifier("amp_mode","ideal_no_noise","gain_mode","output_power","amplification_db",rop).process(Opt_sig);
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%%%%% MODULATE E/O CONVERSION %%%%%%
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[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);
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%%%%%% PD Square Law %%%%%%
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Rx_sig = Photodiode("fsimu",fdac*kover,"dark_current",2e-08,"responsivity",1,"temperature",20,"nep",1.8e-11).process(Rx_sig);
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% Opt_sig.spectrum("displayname",'Opt Spectrum','fignum',10,'normalizeTo0dB',1);
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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);
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%%%%%% Low-pass RX (PD, El. Connectors and Scope %%%%%%
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rx_bwl = rx_bw_nyquist.*f_nyquist;
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% rx_bwl = 80e9;
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Rx_sig = Filter('filtdegree',4,"f_cutoff",rx_bwl,"fs",fdac*kover,"filterType",filtertypes.butterworth,"active",true).process(Rx_sig);
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%%%%%% ROP %%%%%%
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Rx_sig = Amplifier("amp_mode","ideal_no_noise","gain_mode","output_power","amplification_db",rop).process(Opt_sig);
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% %%%%%% Low-pass Scope %%%%%%
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Lp_scpe = Filter('filtdegree',4,"f_cutoff",110e9,"fs",fadc,"filterType",filtertypes.butterworth,"active",true);
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%%%%%% PD Square Law %%%%%%
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Rx_sig = Photodiode("fsimu",fdac*kover,"dark_current",2e-08,"responsivity",1,"temperature",20,"nep",1.8e-11).process(Rx_sig);
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% Rx_sig.spectrum("displayname",'Analog Rx Spectrum','fignum',100,'normalizeTo0dB',1);
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%%%%%% Low-pass RX (PD, El. Connectors and Scope %%%%%%
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rx_bwl = rx_bw_nyquist.*f_nyquist;
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% rx_bwl = 80e9;
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Rx_sig = Filter('filtdegree',4,"f_cutoff",rx_bwl,"fs",fdac*kover,"filterType",filtertypes.butterworth,"active",true).process(Rx_sig);
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%%%%%% Scope %%%%%%
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Scpe_sig = Scope("fsimu",fdac*kover,"fadc",fadc,...
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"delay",0,"fixed_delay",0,"filtertype",filtertypes.butterworth,...
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"samplingdelay",0,"rand_samplingdelay",0,"freq_offset",0,"samp_jitter",0,...
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"adcresolution",8,"quantbuffer",0.1,'block_dc',1,'lpf_active',1,'H_lpf',Lp_scpe).process(Rx_sig);
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% %%%%%% Low-pass Scope %%%%%%
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Lp_scpe = Filter('filtdegree',4,"f_cutoff",110e9,"fs",fadc,"filterType",filtertypes.butterworth,"active",true);
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% Rx_sig.spectrum("displayname",'Analog Rx Spectrum','fignum',100,'normalizeTo0dB',1);
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%%%%%% Scope %%%%%%
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Rx_sig = Scope("fsimu",fdac*kover,"fadc",fadc,...
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"delay",0,"fixed_delay",0,"filtertype",filtertypes.butterworth,...
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"samplingdelay",0,"rand_samplingdelay",0,"freq_offset",0,"samp_jitter",0,...
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"adcresolution",8,"quantbuffer",0.1,'block_dc',1,'lpf_active',1,'H_lpf',Lp_scpe).process(Rx_sig);
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case "awgn"
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Rx_sig = awgn_channel(Digi_sig, ...
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"snr_dB", channel_snr_dB, ...
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"randkey", random_key + 2);
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case {"awgn_alphad", "awgn_1alphad", "awgn_1_plus_alpha_d"}
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delaySamples = max(1, round(channel_delay_symbols * Digi_sig.fs / fsym));
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Rx_sig = awgn_alpha_d_channel(Digi_sig, ...
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"alpha", channel_alpha, ...
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"delay_samples", delaySamples, ...
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"snr_dB", channel_snr_dB, ...
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"randkey", random_key + 2);
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otherwise
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error('Unknown channel_mode "%s". Supported: physical, awgn, awgn_alphaD.', channel_mode);
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end
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txPulseformer = [];
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if apply_pulsef
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@@ -171,9 +194,9 @@ dspParameters.mu_ffe = mu_ffe;
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dspParameters.mu_dfe = mu_dfe;
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dspParameters.mu_dc = mu_dc;
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dspParameters.use_ffe = 1;
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dspParameters.use_dfe = 1;
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dspParameters.use_dfe = 0;
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dspParameters.use_vnle_mlse = 1;
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dspParameters.use_dbtgt = 1;
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dspParameters.use_dbtgt = 0;
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dspParameters.use_dbenc = 0;
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dspParameters.use_ml_mlse = 0;
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dspParameters.showAnalysis = 0;
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@@ -187,7 +210,7 @@ dspParameters.ffe_order_dbtgt = [50, 0, 0];
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dspParameters.dfe_order_dbtgt = dfe_order;
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dspParameters.decoding_mode = decoding_mode;
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scopeOutput = dsp_scope_signal(Scpe_sig, Symbols, Tx_bits, ...
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scopeOutput = dsp_scope_signal(Rx_sig, Symbols, Tx_bits, ...
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"fsym", fsym, ...
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"M", M, ...
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"duob_mode", duob_mode, ...
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