193 lines
4.7 KiB
Matlab
193 lines
4.7 KiB
Matlab
clear all
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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 = 160e9;
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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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pam_mapper = PAMmapper(M,0);
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awg = AWG('preset','M8199B','fdac',fdac,'kover',kover,'lpf_active',0,'f_cutoff',80e9,'lpf_type',filtertypes.gaussian);
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fil_50 = Filter('filtdegree',1,"f_cutoff",50e9,"fsamp",fdac,"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",emlmodes.im_cosinus,"power",5,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",0);
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amp = Amplifier("amp_mode","ideal_no_noise","amplification_db",0,"gain_mode","output_power");
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fib = Fiber("fsimu",fdac*kover,"fiber_length",0,"alpha",0.2,"D",17,"lambda0",1550);
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% %noise loading
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% zeroDB_attenuator = Amplifier("amp_mode","ideal_no_noise","gain_mode","output_power","amplification_db",0);
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%
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% edfa_ = Amplifier("amp_mode","edfa_increase_nase","nase_mode","generate_ase","amplification_db",0,"noifig",33,"gain_mode","output_power");
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%
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% rop_amplifier = Amplifier("amp_mode","ideal_no_noise","amplification_db",-5,"gain_mode","output_power","nase_mode","pass_ase");
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% X = zeroDB_attenuator.process(X);
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% X = edfa_.process(X);
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% X = rop_amplifier.process(X);
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phdiode = Photodiode("fsimu",fdac*kover,"dark_current",2e-08,"responsivity",1,"temperature",20);
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fil_diode = Filter('filtdegree',1,"f_cutoff",120e9,"fsamp",fdac,"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);
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eq = EQ("K",2,"plottrain",0,"plotfinal",1,...
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"training_length",4096*2,"training_loops",5,...
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"Ne",[50,9,9],"Nb",[0,0,0],...
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"DCmu",0.005,"DDmu",[0.0004 0.0004 0.0004 0.0004 ],"DFEmu",0.005,"FFEmu",0.000,...
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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",0,"rho",0.0005,"ideal_dfe",0);
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%% PROCESS
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% INFORMATION SIGNAL
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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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bits = Informationsignal(bitpattern);
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mod_out = pam_mapper.map(bits);
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reference = mod_out;
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mod_out.signal = applyPulseShaping(mod_out.signal,fsym,fdac);
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% ELECTRICAL DOMAIN
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X = awg.process(mod_out);
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X = X.normalize;
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% OPTICAL DOMAIN
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X = extmodlaser.process(X);
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X = amp.process(X);
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X = fib.process(X);
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X = phdiode.process(X);
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X = fil_diode.process(X);
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% ELECTRICAL DOMAIN
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% X = scp.process(X);
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X = X.resample("fs_out",2*fsym,"fs_in",fsimu);
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% INFORMATION SIGNAL
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X = X.normalize;
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eq_out = eq.process(X,reference);
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rx_series = eq_out.signal;
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demap_out = pam_mapper.demap(eq_out);
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[bits,errors,BER] = calc_ber(demap_out.signal(:,10000:end-20),bitpattern(10000:end-19,:)',0);
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%%
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figure(22)
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clf
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subplot(3,1,1)
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hold on
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plot(reference.signal(10000:end-20));
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plot(rx_series(10000:end-20));
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hold off
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subplot(3,1,2)
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hold on
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plot(reference.signal(4150:4175));
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plot(rx_series(4150:4175));
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hold off
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subplot(3,1,3)
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hold on
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stem(demap_out.signal(1,4150:4175))
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stem(bitpattern(4150:4175,1)')
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hold off
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legend
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xax = 1:eq_out.length;
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col = cbrewer2('Set1',4);
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figure(12)
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sgtitle('Laser Linewidth = 10 MHz; SIR = 24 dB ; $N_{1,2}$ = 100')
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subplot(1,4,1:2)
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scatter(xax,eq_out.signal,4,'.','MarkerEdgeColor',col(1,:),'DisplayName','No MPI Mitigation');
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xlim([1, xax(end)]);
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ylim([-2 2]);
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xlabel('Sampling Index')
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ylabel('Amplitude')
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legend
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subplot(1,4,3:4)
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scatter(1:X.length,X.signal,4,'.','MarkerEdgeColor',col(2,:),'DisplayName','A1');
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xlim([1, xax(end)]);
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ylim([-2 2]);
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xlabel('Sampling Index')
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ylabel('Amplitude')
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legend
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%
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% subplot(1,4,3)
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% scatter(xax,a2_out,4,'.','MarkerEdgeColor',col(3,:),'DisplayName','A2');
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% xlim([1, xax(end)]);
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% ylim([-2 2]);
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% xlabel('Sampling Index')
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% ylabel('Amplitude')
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% legend
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%
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% subplot(1,4,4)
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% scatter(xax,a1_a2_out,4,'.','MarkerEdgeColor',col(4,:),'DisplayName','A1+A2');
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% xlim([1, xax(end)]);
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% ylim([-2 2]);
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% xlabel('Sampling Index')
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% ylabel('Amplitude')
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% legend
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% set(gcf,'Units','centimeters')
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% set(gcf,'Position',[2 2 25 10])
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a = fftshift(xcorr(X.signal(1,:),circshift(bitpattern(:,1)',0)));
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% BER
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if (length(X.signal) ~= length(bitpattern'))
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warning("TX and RX bitstreams have different length...")
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end
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disp(demap_out.logbook);
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disp(['BER: ', sprintf('%2E',BER)]);
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