MPI Simulations and stuff

2024-08-14 09:36:51 +02:00
parent 1eeb970d8f
commit 34f9149346
61 changed files with 4295 additions and 429 deletions
--- a/projects/MPI_analysis_Mai24/base_simulation.m
+++ b/projects/MPI_analysis_Mai24/base_simulation.m
@@ -0,0 +1,124 @@
+
+M=4;
+
+fdac = 256e9;%fsym;
+fadc = 256e9;
+fsym = [96:16:256].*1e9;
+
+%fsym = 160e9;
+% 1) PRBS Generation
+O = 18; %order of prbs
+N = 2^(O-1); %length of prbs
+[~,seed] = prbs(O,1); %initialize first seed of prbs
+bitpattern=[];
+
+for i = 1:log2(M)
+    [bitpattern(:,i),seed] = prbs(O,N,seed);
+end
+
+if M == 6
+    bitpattern = reshape(bitpattern,[],1);
+    bitpattern = bitpattern(1:end-mod(length(bitpattern),5));
+end
+
+% 2 ) Build Inf. signal class
+bits = Informationsignal(bitpattern);
+
+% 3) Digi modulation -> PAM-M signal
+digimod_out = PAMmapper(M,0).map(bits);
+
+% 5) AWG (lowpass, quantization, sample and hold)
+kover = 8;
+LP_awg      = Filter('filtdegree',4,"f_cutoff",75e9,"fs",fdac*kover,"filterType",filtertypes.butterworth);
+
+powerlist = [];
+for i = length(fsym):-1:1
+    digimod_out.fs = fsym(i);
+
+    X = Pulseformer("fsym",fsym(i),"fdac",fdac,"pulse","rrc","pulselength",16,"rrcalpha",0.1).process(digimod_out);
+    %X = digimod_out;
+
+    X = AWG("fdac",fdac,"dac_min",-1,"dac_max",1,"lpf_active",1,"H_lpf",LP_awg,"kover",kover,"bit_resolution",5.5,"normalize2dac",1,"upsampling_method","samplehold").process(X);
+
+
+ % 6) Lowpass behavior before laser
+    X =  LP_modulator.process(X);
+
+    % 7) Normalize signal
+    X = X.normalize("mode","oneone");
+
+    % 1) Laser; Modulation ->  OPTICAL DOMAIN
+    u_pi = 2;
+    vbias = -vb(m);
+    extmodlaser = EML("mode",eml_mode.im_cosinus,"power",3,"fsimu",X.fs,"lambda",1290,"bias",vbias,"u_pi",u_pi,"linewidth",laser_linewidth(l),"randomkey",pn_key(pnk));
+    E = X.*vp(n);
+
+    [Opt,extmodlaser] = extmodlaser.process(E);
+    
+    figure(m)
+    hold on
+    scatter(E.signal(1:100000),(abs(Opt.signal(1:100000)).^2)*1e3,0.1,'.','DisplayName','Modulator TF')
+    xlabel('Input in V')
+    ylabel('abs(Output) in mW')
+
+    % ER = 10*log10(max(abs(Opt.signal).^2)/min(abs(Opt.signal).^2));
+
+    Opt = LP_opt.process(Opt);
+
+    cspr(s,l,pnk,n,m) = Opt.cspr;
+    mod_out_pow(s,l,pnk,n,m) = Opt.power;
+
+    % 2) ping pong fiber propagation
+    Interference_sig    = Fiber("fsimu",Opt.fs,"fiber_length",mpi_path*2/1000,"alpha",0,"D",0,"lambda0",1310,"gamma",0).process(Opt);
+
+    Interference_sig    = Amplifier("amp_mode","ideal_no_noise","gain_mode","gain","amplification_db",-sir(s)).process(Interference_sig);
+
+    % In the meantime: delay the main signal
+    [Main_sig,dly] = Opt.delay("delay_meter",mpi_path*2);
+
+    % Add
+    Combined_sig = Main_sig + Interference_sig;
+
+    % Cut (due to the delays there is a jump in the signals)
+    if dly == 0;dly = 1;end
+    Combined_sig.signal = Combined_sig.signal(ceil(dly):end);
+
+    % Fiber
+    Combined_sig    = Fiber("fsimu",Combined_sig.fs,"fiber_length",2,"alpha",0.3,"D",0,"lambda0",1310,"gamma",0,"Dslope",0.08).process(Combined_sig);
+
+
+
+
+    powerlist(i)=X.power;
+
+    % Sample to 2x fsym
+    X =  X.resample("fs_in",kover*fdac,"fs_out",2*fsym(i));
+
+    % Sync Rx signal with reference
+    [X,D,cuts] = X.tsynch("reference",digimod_out,"fs_ref",fsym(i));
+
+    [EQ_sig,EQ_sym] = EQ_silas("Ne",[50,0,0],"Nb",[2,0,0],"trainlength",4096,...
+        "sps",2,...
+        "mu_dc_dd",0.00,...
+        "mu_dc_train",0.0,...
+        "mu_ffe_train",0.00,...
+        "mu_dfe_train",0.005,...
+        "mu_ffe_dd",[0.0004 0.0006 0.0003],...
+        "mu_dfe_dd",0.005,...
+        "ddloops",3,...
+        "trainloops",3,...
+        "eq_parallelization_blocklength",1, ...
+        "eq_updatelatency",1,...
+        "eq_avg_blocklength",0).process(X,digimod_out);
+
+    % Demap
+    Rx_Bits = PAMmapper(M,0).demap(EQ_sig);
+
+    % BER
+    [~,errors_bm,BER(i),errors] = calc_ber(Rx_Bits.signal,bitpattern,"skip_front",100,"skip_end",150,"returnErrorLocation",1);
+end
+
+
+figure()
+stem(fsym.*1e-9,powerlist);
+xticks(fsym.*1e-9)