Minimal Working - seems too good?!
This commit is contained in:
Silas Oettinghaus
244
comm_tb.m
244
comm_tb.m
@@ -1,9 +1,11 @@
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O = 14; %order of prbs
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clear all
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O = 17; %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;
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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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@@ -17,168 +19,152 @@ fadc = 256e9;
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% Simulation frequency in "analog domain"
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fsimu = kover * fdac ;
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%SIMULATE
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[settings, button] = settingsdlg(...
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'Description' , ['This dialog will set the ', ...
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'parameters used by FMINCON()'], ...
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'title' , 'FMINCON() options', ...
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'separator' , 'Unconstrained/General', ...
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{'This is a checkbox'; 'Check'} , [false, false],...
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{'Tolerance X';'TolX'} , 1e-6, ...
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{'Tolerance on Function';'TolFun'} , 1e-6, ...
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'Algorithm' , {'active-set','interior-point'}, ...
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'separator' , 'Constrained', ...
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{'Tolerance on Constraints';'TolCon'}, 1e-6);
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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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%CONSTRUCTION
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pam_mapper = PAMmapper(M,0);
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Bits = Informationsignal(bitpattern);
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awg = AWG('preset','M8196A','fdac',fdac,'kover',kover,'lpf_active',0);
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Bits.signal = pam_mapping(Bits.signal,M,0);
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Bits.signal = applyPulseShaping(Bits.signal,fsym,fdac);
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awg = AWG('preset','M8196A','fdac',fdac,'kover',kover,'lpf_active',1);
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awgSignal = awg.process_channel(Bits.signal);
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fil = Filter('filtdegree',4,"f_cutoff",50e9,"fsamp",fdac,"filterType",filtertypes.bessel_bilin);
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filtered = fil.process(awgSignal);
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fil_tx = Filter('filtdegree',1,"f_cutoff",50e9,"fsamp",fdac,"filterType",filtertypes.bessel_bilin);
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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",10,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",1000000);
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laserfield = extmodlaser.process(filtered);
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extmodlaser = EML("mode",emlmodes.im_cosinus,"power",10,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",0);
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att = Amplifier("amplification_db",10,"amp_mode","gain","type","ideal","saturation_mode",0,'saturation_power',10);
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att_out = att.process(laserfield);
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amp = Amplifier("amplification_db",10,"amp_mode","gain","type","ideal","saturation_mode",0,'saturation_power',10);
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fib = Fiber("fsimu",fdac*kover,"fiber_length",0,"alpha",0.2,"D",17,"lambda0",1550);
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fib_out = fib.process(att_out);
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fib = Fiber("fsimu",fdac*kover,"fiber_length",2,"alpha",0.2,"D",17,"lambda0",1550);
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phdiode = Photodiode("fsimu",fdac*kover,"dark_current",2e-08,"responsivity",1,"temperature",20);
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phdiod_out = phdiode.process(fib_out);
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fil = Filter('filtdegree',4,"f_cutoff",70e9,"fsamp",fdac,"filterType",filtertypes.bessel_bilin);
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phdiod_out2 = fil.process(phdiod_out);
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fil_diode = Filter('filtdegree',4,"f_cutoff",70e9,"fsamp",fdac,"filterType",filtertypes.bessel_bilin);
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scp = Scope("fsimu",fdac*kover,"fadc",fadc,...
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"delay",0,"fixed_delay",0,"lpf_bw",120e9,"filtertype",filtertypes.bessel_inp,...
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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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scope_out = scp.process(phdiod_out2);
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eq = EQ("K",2,"plottrain",0,"plotfinal",1,"training_length",2048,"Ne",[25,5,5],"Nb",[2,0,0],"training_loops",5,"DCmu",0.005,"DDmu",[0.0004 0.0004 0.0004 0.0004 ],"DFEmu",0.005,"FFEmu",0,"thres",[0.005 0.004 0.0005 ]);
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resample_out = resample(scope_out,fsym,fadc);
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%SIMULATE
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figure;
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hold on
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plot( nmlze(resample(shapedData,fadc,fdac)),'DisplayName','shapedData Data');
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plot( nmlze(resample(awgSignal,fadc,fdac*kover)),'DisplayName','AWG Data');
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plot( nmlze(scope_out),'DisplayName','scope out out');
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hold off
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% figure;
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% hold on
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% plot(awgSignal,'DisplayName','skew 0');
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% plot(filtered,'DisplayName','filtered');
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% plot(abs(laserfield),'DisplayName','laser');
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% plot(abs(att_out),'DisplayName','att_out');
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% plot(abs(fib_out),'DisplayName','fiber_out');
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% plot(abs(phdiod_out),'DisplayName','photo diode out');
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% hold off
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% figure;
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% hold on
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% plot(nmlze(pamData),'DisplayName','PAM Data');
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% plot(nmlze(resample_out),'DisplayName','system out');
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% hold off
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function y = nmlze(x)
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y = (x-min(x)) / max((x-min(x)));
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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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function pam_sig = pam_mapping(bitpattern, M, unipolar)
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X = Informationsignal(bitpattern);
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switch log2(M)
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case 1
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% 2-ASK: BPSK / OOK
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pam_sig=bitpattern(:,1);
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PAMSIG = pam_mapper.map(X);
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if unipolar==0
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pam_sig=2*pam_sig-1;
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end
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X.signal = applyPulseShaping(PAMSIG.signal,fsym,fdac);
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case 2
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% 4-ASK:
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pam_sig=2*bitpattern(:,1)+(bitpattern(:,1)==bitpattern(:,2));
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% ELECTRICAL DOMAIN
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X = awg.process(X);
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if unipolar==0
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pam_sig=2*pam_sig-3;
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end
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X = fil_tx.process(X);
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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",fadc);
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case 3
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% 8-ASK:
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x1 = bitpattern(:,1);
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x2 = (bitpattern(:,1)==bitpattern(:,3));
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x3 = x2~=bitpattern(:,2);
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% INFORMATION SIGNAL
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X = eq.process(X,PAMSIG);
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pam_sig = 4*x1 + 2*x2 + x3;
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X = pam_mapper.demap(X);
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if unipolar==0
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pam_sig=2*pam_sig-7;
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end
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% BER
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[bits,errors,BER] = calc_ber(X.signal(:,10000:end-20),bitpattern(10000:end-20,:)',0);
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case 4
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% 16-ASK:
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x1 = bitpattern(:,1);
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x2 = (bitpattern(:,1)==bitpattern(:,4));
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x3 = x2~=bitpattern(:,3);
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x4 = x3~=bitpattern(:,2);
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pam_sig = 8*x1 + 4*x2 + 2*x3 + x4;
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if unipolar==0
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pam_sig=2*pam_sig-15;
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end
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end
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end
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disp(['BER: ', sprintf('%2E',BER)]);
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disp(X.logbook);
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function yout = applyPulseShaping(xin,fsym,fdac)
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if ~rem(fdac,fsym)
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%ist ein Vielfaches
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sps = fdac / fsym;
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up = sps;
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dn = 1;
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else
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%ist kein Vielfaches
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up = fdac / gcd(fdac, fsym);
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dn = fsym / gcd(fdac, fsym);
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sps= up;
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end
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if ~rem(fdac,fsym)
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%ist ein Vielfaches
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sps = fdac / fsym;
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up = sps;
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dn = 1;
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else
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%ist kein Vielfaches
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up = fdac / gcd(fdac, fsym);
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dn = fsym / gcd(fdac, fsym);
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sps= up;
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end
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%Bau das Filter (hier rrc)
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racos_len = 2048;
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alpha = 0.1;
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h = rcosdesign(alpha,racos_len,sps);
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%Apply Filter using Matlab build in fctn.
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yout = upfirdn(xin,h,up,dn);
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%cut signal, which is longer due to fir filter
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st = up/dn*racos_len/2; %we need to cut y_out
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en = st + (length(xin)*up/dn) -1;
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%Bau das Filter (hier rrc)
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racos_len = 2048;
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alpha = 0.1;
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h = rcosdesign(alpha,racos_len,sps);
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yout = yout(st:en);
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%Apply Filter using Matlab build in fctn.
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yout = upfirdn(xin,h,up,dn);
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%Check output integrity
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if (up/dn * length(xin)) ~= length(yout)
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warning('Check signal length after pulse shaping');
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end
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%cut signal, which is longer due to fir filter
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st = round(up/dn*racos_len/2); %we need to cut y_out
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en = round(st + (length(xin)*up/dn) -1);
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yout = yout(st:en);
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%Check output integrity
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if round(up/dn * length(xin)) ~= length(yout)
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warning('Check signal length after pulse shaping');
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end
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end
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function [bits,errors,BER] = calc_ber(data_in,data_ref,skip)
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data_ref=logical(data_ref);
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data_in = logical(data_in);
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bits = 0;
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errors=0;
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data_ref_overlap=zeros(size(data_ref,1),skip+(length(data_ref)-size(data_in,2)));
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data_ref_pointer=0;
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% Determine BER
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bits = bits+size(data_in,2)-skip;
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try
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errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end,:),2 );
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catch
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%warning('BER calculation not optimal: Arrays have incompatible sizes for this operation.')
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errors = NaN;
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end
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try
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errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end-1,:),2 );
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end
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try
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errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end-2,:),2 );
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end
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BER = sum(errors)/sum(bits);
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end
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end
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