stuff from PC
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Silas Oettinghaus
173
imddmodel.m
Normal file
173
imddmodel.m
Normal file
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function BER = imddmodel(dc_mu,sir,linewidth)
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rng(2023);
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%% Set Simulation Variables
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sir = sir;
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delay = 300; %mpi delay in meter
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fiblen = 0.5; %main link in km
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laser_linewidth = linewidth;
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O = 18; %order of prbs
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N = 2^(O-1); %length of prbs
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[~,seed] = prbs(O,1); %initialize first seed of prbs
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% Modulation
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M = 4; %PAM-M
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bitpattern = zeros(N,log2(M));
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% Symbol Rate
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fsym = 112e9;
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% DAC Rate
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fdac = 120e9;
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% Simulation oversampling rate "k";
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kover = 16;
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% ADC Rate
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fadc = 256e9;
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% Simulation frequency in "analog domain"
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fsimu = kover * fdac ;
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%% CONSTRUCT ALL CLASSES
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digimod = PAMmapper(M,0);
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pulseform = Pulseformer("pulseform","rrc","fdac",fdac,"fsym",fsym,"pulselength",32,"rrcalpha",0.1);
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awg = AWG('fdac',fdac,'kover',kover,'lpf_active',1,'f_cutoff',56e9,'lpf_type',filtertypes.gaussian,'bit_resolution',5.5);
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lp_laser = Filter('filtdegree',1,"f_cutoff",50e9,"fsamp",fdac*kover,"filterType",filtertypes.bessel_inp);
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u_pi = 3.5;
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vbias = (0.5*u_pi)-u_pi;
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extmodlaser = EML("mode",eml_mode.im_cosinus,"power",15,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",laser_linewidth);
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fib = Fiber("fsimu",fdac*kover,"fiber_length",fiblen,"alpha",0.2,"D",16,"lambda0",thz2nm(193.1),"gamma",0);
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reflectionpoint = Amplifier("amp_mode","ideal_no_noise","gain_mode","gain","amplification_db",sir);
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reflectionprop = Fiber("fsimu",fdac*kover,"fiber_length",2*delay/1000,"alpha",0.2,"D",16,"lambda0",1550,"gamma",0);
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opticatten = Amplifier("amp_mode","ideal_no_noise","gain_mode","output_power","amplification_db",-5);
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edfaamp = Amplifier("amp_mode","edfa_increase_nase","gain_mode","output_power","amplification_db",0,"nase_mode","generate_ase","noifig",10.5);
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phdiode = Photodiode("fsimu",fdac*kover,"dark_current",0,"responsivity",1,"temperature",20);
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lp_diode = Filter('filtdegree',1,"f_cutoff",50e9,"fsamp",fdac*kover,"filterType",filtertypes.bessel_inp);
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scp = Scope("fsimu",fdac*kover,"fadc",fadc,...
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"delay",0,"fixed_delay",0,"lpf_bw",113e9,"filtertype",filtertypes.butterworth,...
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"samplingdelay",0,"rand_samplingdelay",0,"freq_offset",0,"samp_jitter",0,...
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"adcresolution",6,"quantbuffer",0.1,'block_dc',1);
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eq = EQ("K",2,"plottrain",0,"plotfinal",0,...
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"training_length",1024,"training_loops",5,...
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"Ne",[50,0,0],"Nb",[0,0,0],...
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"DCmu",dc_mu,"DDmu",[0.0004 0.0004 0.0004 0.0004 ],"DFEmu",0.005,"FFEmu",0.00,...
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"dd_loops",2,"epsilon",[10 100 1000 ],"M",4,...
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"thres",[0.005 0.004 0.0005 ],"l1act",0,"delay",1,"rho",0.0005,"ideal_dfe",0,"DB_aim",0);
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%% PROCESS
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% PRBS Generation
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for i = 1:log2(M)
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[bitpattern(:,i),seed] = prbs(O,N,seed);
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end
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%bitpattern = prms_out';
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% Build Inf. signal class
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bits = Informationsignal(bitpattern);
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% Digi Mod
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mod_out = digimod.map(bits);
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% merken für EQ training
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reference = mod_out;
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% shape shape
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X = pulseform.process(mod_out);
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test = applyPulseShaping(reference.signal,fsym,fdac);
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% AWG -> ELECTRICAL DOMAIN
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awg_out = awg.process(X);
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X = lp_laser.process(awg_out);
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X = lp_laser.process(X);
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X = X.normalize("mode","oneone");
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X.signal = X.signal .* 1.3800;
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% Laser; Modulation -> OPTICAL DOMAIN
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X = extmodlaser.process(X);
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% Fiber Propagation
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X = fib.process(X);
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%% Reflect with attenuation
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R = reflectionpoint.process(X);
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% Propagate
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R = reflectionprop.process(R);
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disp(['SIR ',num2str(10*log10(X.power/R.power))]);
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% Delay
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R = R.delay("delay_meter",delay);
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% Add together
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X = X+R;
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%%
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X = opticatten.process(X);
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X = edfaamp.process(X);
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% Photo Diode -> ELECTRICAL DOMAIN
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X = phdiode.process(X);
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X = lp_diode.process(X);
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% Oscilloscope (Sampling to f_adc; Quantization; Bandwidth Limitation)
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X = scp.process(X);
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% Resample to Symbol Rate
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X = X.resample("fs_out",2*fsym,"fs_in",fadc);
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% Normalize
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X = X.normalize("mode","rms");
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% Equalizer
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X = eq.process(X,reference);
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%% MPI reduction
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wl = 10000;
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mpi_red = X;
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mpi_red.signal = X.signal - 1/wl .* movsum( X.signal,[wl/2,wl/2]);
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% Digi Demod
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demap_out = digimod.demap(X);
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demap_out_a1 = digimod.demap(mpi_red);
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% BER
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[bits,errors,ber] = calc_ber(demap_out.signal(1:end-1,:),bitpattern(1:end,:),0);
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[bits,errors,ber_a1] = calc_ber(demap_out_a1.signal(1:end-1,:),bitpattern(1:end,:),0);
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disp(['BER: ', sprintf('%2E',ber), ' ERRORS: ' ,num2str(sum(errors))]);
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disp(['BER: ', sprintf('%2E',ber_a1), ' ERRORS: ' ,num2str(sum(errors))]);
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BER.ber = ber;
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BER.ber_a1 = ber_a1;
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end
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