changes from friday
This commit is contained in:
Silas Oettinghaus
@@ -63,7 +63,7 @@ classdef AWG
|
||||
% obj.fdac = 256e9;
|
||||
obj.dac_max = 0.5;
|
||||
obj.dac_min = -.5;
|
||||
obj.f_cutoff = 80e9;
|
||||
obj.f_cutoff = 800e9;
|
||||
|
||||
end
|
||||
|
||||
@@ -75,6 +75,9 @@ classdef AWG
|
||||
|
||||
function signalclass_out = process(obj,signalclass_in)
|
||||
|
||||
|
||||
len_in = length(signalclass_in.signal);
|
||||
|
||||
% actual processing of the signal (steps 1. - 3.)
|
||||
signalclass_in.signal = obj.process_(signalclass_in.signal);
|
||||
|
||||
@@ -93,6 +96,12 @@ classdef AWG
|
||||
% write to output
|
||||
signalclass_out = signalclass_in;
|
||||
|
||||
len_out = length(signalclass_out.signal);
|
||||
|
||||
if len_out ~= len_in * obj.kover
|
||||
warning("AWG: Output length maybe not correct.")
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
function elec_out = process_(obj,data_in)
|
||||
@@ -129,7 +138,7 @@ classdef AWG
|
||||
elec_out = repmat(elec_out,obj.repetitions,obj.kover);
|
||||
elec_out = reshape(elec_out',[],1);
|
||||
|
||||
% 3. Add skew
|
||||
% 3. Add skew (not working so far)
|
||||
if obj.skew_active
|
||||
elec_out = obj.skew(elec_out);
|
||||
end
|
||||
|
||||
@@ -93,7 +93,8 @@ classdef Scope
|
||||
% sample signal
|
||||
% TODO: implement and test the delays. Also look for delay of
|
||||
% lpf filter
|
||||
yout = obj.sampleSignal(xin);
|
||||
%yout = obj.sampleSignal(xin);
|
||||
yout = resample(xin,obj.fadc,obj.fsimu);
|
||||
|
||||
% quantize signal
|
||||
yout = obj.quantize(yout);
|
||||
@@ -148,6 +149,8 @@ classdef Scope
|
||||
% Sample the signal using linear interpolation
|
||||
sampout = xin(floor(inx_re)) .* (1 - val_re) + xin(ceil(inx_re)) .* val_re ;
|
||||
|
||||
sampout2 = resample(xin,obj.fadc,obj.fsimu);
|
||||
|
||||
end
|
||||
|
||||
function quantout = quantize(obj,xin)
|
||||
|
||||
34
Functions/applyPulseShaping.m
Normal file
34
Functions/applyPulseShaping.m
Normal file
@@ -0,0 +1,34 @@
|
||||
function yout = applyPulseShaping(xin,fsym,fdac)
|
||||
|
||||
if ~rem(fdac,fsym)
|
||||
%ist ein Vielfaches
|
||||
sps = fdac / fsym;
|
||||
up = sps;
|
||||
dn = 1;
|
||||
else
|
||||
%ist kein Vielfaches
|
||||
up = fdac / gcd(fdac, fsym);
|
||||
dn = fsym / gcd(fdac, fsym);
|
||||
sps= up;
|
||||
end
|
||||
|
||||
%Bau das Filter (hier rrc)
|
||||
racos_len = 2048;
|
||||
alpha = 0.1;
|
||||
h = rcosdesign(alpha,racos_len,sps);
|
||||
|
||||
%Apply Filter using Matlab build in fctn.
|
||||
yout = upfirdn(xin,h,up,dn);
|
||||
|
||||
%cut signal, which is longer due to fir filter
|
||||
st = round(up/dn*racos_len/2); %we need to cut y_out
|
||||
en = round(st + (length(xin)*up/dn) -1);
|
||||
|
||||
yout = yout(st:en);
|
||||
|
||||
%Check output integrity
|
||||
if round(up/dn * length(xin)) ~= length(yout)
|
||||
warning('Check signal length after pulse shaping');
|
||||
end
|
||||
|
||||
end
|
||||
28
Functions/calc_ber.m
Normal file
28
Functions/calc_ber.m
Normal file
@@ -0,0 +1,28 @@
|
||||
function [bits,errors,BER] = calc_ber(data_in,data_ref,skip)
|
||||
|
||||
data_ref=logical(data_ref);
|
||||
data_in = logical(data_in);
|
||||
bits = 0;
|
||||
errors=0;
|
||||
|
||||
data_ref_overlap=zeros(size(data_ref,1),skip+(length(data_ref)-size(data_in,2)));
|
||||
data_ref_pointer=0;
|
||||
% Determine BER
|
||||
|
||||
bits = bits+size(data_in,2)-skip;
|
||||
try
|
||||
errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end,:),2 );
|
||||
catch
|
||||
%warning('BER calculation not optimal: Arrays have incompatible sizes for this operation.')
|
||||
errors = NaN;
|
||||
end
|
||||
try
|
||||
errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end-1,:),2 );
|
||||
end
|
||||
try
|
||||
errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end-2,:),2 );
|
||||
end
|
||||
|
||||
BER = sum(errors)/sum(bits);
|
||||
|
||||
end
|
||||
2
construct_classes.m
Normal file
2
construct_classes.m
Normal file
@@ -0,0 +1,2 @@
|
||||
|
||||
|
||||
2
loop_simulation.m
Normal file
2
loop_simulation.m
Normal file
@@ -0,0 +1,2 @@
|
||||
|
||||
|
||||
@@ -1,183 +0,0 @@
|
||||
%clear all
|
||||
|
||||
O = 17; %order of prbs
|
||||
N = 2^(O-1); %length of prbs
|
||||
[~,seed] = prbs(O,1); %initialize first seed of prbs
|
||||
|
||||
% Modulation
|
||||
M = 4; %PAM-M
|
||||
bitpattern = zeros(N,log2(M));
|
||||
|
||||
% Symbol Rate
|
||||
fsym = 92e9;
|
||||
% DAC Rate
|
||||
fdac = 120e9;
|
||||
% Simulation oversampling rate "k";
|
||||
kover = 16;
|
||||
% ADC Rate
|
||||
fadc = 256e9;
|
||||
% Simulation frequency in "analog domain"
|
||||
fsimu = kover * fdac ;
|
||||
|
||||
%CONSTRUCTION
|
||||
pam_mapper = PAMmapper(M,0);
|
||||
|
||||
awg = AWG('preset','M8199B','fdac',fdac,'kover',kover,'lpf_active',1,'f_cutoff',80e9,'lpf_type',filtertypes.gaussian);
|
||||
|
||||
|
||||
fil_tx = Filter('filtdegree',1,"f_cutoff",50e9,"fsamp",fdac,"filterType",filtertypes.bessel_inp);
|
||||
|
||||
u_pi = 3.5;
|
||||
vbias = (0.5*u_pi)-u_pi;
|
||||
extmodlaser = EML("mode",emlmodes.im_cosinus,"power",5,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",0);
|
||||
|
||||
amp = Amplifier("amp_mode","ideal_no_noise","amplification_db",0,"gain_mode","output_power");
|
||||
|
||||
fib = Fiber("fsimu",fdac*kover,"fiber_length",0,"alpha",0.2,"D",17,"lambda0",1550);
|
||||
|
||||
%noise loading
|
||||
zeroDB_attenuator = Amplifier("amp_mode","ideal_no_noise","gain_mode","output_power","amplification_db",0);
|
||||
|
||||
edfa_ = Amplifier("amp_mode","edfa_increase_nase","nase_mode","generate_ase","amplification_db",0,"noifig",33,"gain_mode","output_power");
|
||||
|
||||
rop_amplifier = Amplifier("amp_mode","ideal_no_noise","amplification_db",0,"gain_mode","output_power","nase_mode","pass_ase");
|
||||
|
||||
|
||||
phdiode = Photodiode("fsimu",fdac*kover,"dark_current",2e-08,"responsivity",1,"temperature",20);
|
||||
|
||||
fil_diode = Filter('filtdegree',1,"f_cutoff",70e9,"fsamp",fdac,"filterType",filtertypes.bessel_inp);
|
||||
|
||||
scp = Scope("fsimu",fdac*kover,"fadc",fadc,...
|
||||
"delay",0,"fixed_delay",0,"lpf_bw",113e9,"filtertype",filtertypes.butterworth,...
|
||||
"samplingdelay",0,"rand_samplingdelay",0,"freq_offset",0,"samp_jitter",0,...
|
||||
"adcresolution",6,"quantbuffer",0.1);
|
||||
|
||||
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 ]);
|
||||
|
||||
%SIMULATE
|
||||
|
||||
% INFORMATION SIGNAL
|
||||
for i = 1:log2(M)
|
||||
[bitpattern(:,i),seed] = prbs(O,N,seed);
|
||||
end
|
||||
|
||||
bits = Informationsignal(bitpattern);
|
||||
|
||||
mod_out = pam_mapper.map(bits);
|
||||
reference = mod_out;
|
||||
mod_out.signal = applyPulseShaping(mod_out.signal,fsym,fdac);
|
||||
|
||||
% ELECTRICAL DOMAIN
|
||||
X = awg.process(mod_out);
|
||||
|
||||
% X = fil_tx.process(X);
|
||||
%X = fil_tx.process(X);
|
||||
|
||||
X = X.normalize;
|
||||
|
||||
% OPTICAL DOMAIN
|
||||
X = extmodlaser.process(X);
|
||||
|
||||
X = amp.process(X);
|
||||
|
||||
X = fib.process(X);
|
||||
|
||||
% X = zeroDB_attenuator.process(X);
|
||||
% X = edfa_.process(X);
|
||||
% X = rop_amplifier.process(X);
|
||||
|
||||
X = phdiode.process(X);
|
||||
|
||||
X = fil_diode.process(X);
|
||||
|
||||
% ELECTRICAL DOMAIN
|
||||
X = scp.process(X);
|
||||
|
||||
X = X.resample("fs_out",2*fsym,"fs_in",fadc);
|
||||
|
||||
% INFORMATION SIGNAL
|
||||
X = X.normalize;
|
||||
X = eq.process(X,reference);
|
||||
rx_series = X.signal;
|
||||
|
||||
X = pam_mapper.demap(X);
|
||||
|
||||
|
||||
% BER
|
||||
[bits,errors,BER] = calc_ber(X.signal(:,10000:end-20),bitpattern(10000:end-20,:)',0);
|
||||
|
||||
disp(['BER: ', sprintf('%2E',BER)]);
|
||||
|
||||
|
||||
figure()
|
||||
hold on
|
||||
plot(reference.signal);
|
||||
plot(rx_series);
|
||||
hold off
|
||||
|
||||
disp(X.logbook);
|
||||
|
||||
function yout = applyPulseShaping(xin,fsym,fdac)
|
||||
|
||||
if ~rem(fdac,fsym)
|
||||
%ist ein Vielfaches
|
||||
sps = fdac / fsym;
|
||||
up = sps;
|
||||
dn = 1;
|
||||
else
|
||||
%ist kein Vielfaches
|
||||
up = fdac / gcd(fdac, fsym);
|
||||
dn = fsym / gcd(fdac, fsym);
|
||||
sps= up;
|
||||
end
|
||||
|
||||
%Bau das Filter (hier rrc)
|
||||
racos_len = 2048;
|
||||
alpha = 0.1;
|
||||
h = rcosdesign(alpha,racos_len,sps);
|
||||
|
||||
%Apply Filter using Matlab build in fctn.
|
||||
yout = upfirdn(xin,h,up,dn);
|
||||
|
||||
%cut signal, which is longer due to fir filter
|
||||
st = round(up/dn*racos_len/2); %we need to cut y_out
|
||||
en = round(st + (length(xin)*up/dn) -1);
|
||||
|
||||
yout = yout(st:en);
|
||||
|
||||
%Check output integrity
|
||||
if round(up/dn * length(xin)) ~= length(yout)
|
||||
warning('Check signal length after pulse shaping');
|
||||
end
|
||||
|
||||
end
|
||||
|
||||
function [bits,errors,BER] = calc_ber(data_in,data_ref,skip)
|
||||
|
||||
data_ref=logical(data_ref);
|
||||
data_in = logical(data_in);
|
||||
bits = 0;
|
||||
errors=0;
|
||||
|
||||
data_ref_overlap=zeros(size(data_ref,1),skip+(length(data_ref)-size(data_in,2)));
|
||||
data_ref_pointer=0;
|
||||
% Determine BER
|
||||
|
||||
bits = bits+size(data_in,2)-skip;
|
||||
try
|
||||
errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end,:),2 );
|
||||
catch
|
||||
%warning('BER calculation not optimal: Arrays have incompatible sizes for this operation.')
|
||||
errors = NaN;
|
||||
end
|
||||
try
|
||||
errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end-1,:),2 );
|
||||
end
|
||||
try
|
||||
errors = sum( data_in(:,skip+1:end,:) ~= data_ref(:,skip+1:end-2,:),2 );
|
||||
end
|
||||
|
||||
BER = sum(errors)/sum(bits);
|
||||
|
||||
end
|
||||
|
||||
37
process_simulation.m
Normal file
37
process_simulation.m
Normal file
@@ -0,0 +1,37 @@
|
||||
|
||||
|
||||
|
||||
|
||||
figure(22)
|
||||
clf
|
||||
subplot(2,1,1)
|
||||
hold on
|
||||
plot(reference.signal(10000:end-20));
|
||||
plot(rx_series(10000:end-20));
|
||||
hold off
|
||||
subplot(2,1,2)
|
||||
hold on
|
||||
plot(reference.signal(4150:4175));
|
||||
plot(rx_series(4150:4175));
|
||||
hold off
|
||||
|
||||
figure()
|
||||
hold on
|
||||
stem(X.signal(1,:))
|
||||
stem(bitpattern(:,1)')
|
||||
hold off
|
||||
|
||||
a = fftshift(xcorr(X.signal(1,:),circshift(bitpattern(:,1)',0)));
|
||||
|
||||
% BER
|
||||
if (length(X.signal) ~= length(bitpattern'))
|
||||
warning("TX and RX bitstreams have different length...")
|
||||
end
|
||||
|
||||
[bits,errors,BER] = calc_ber(X.signal(:,10000:end-20),bitpattern(10000:end-19,:)',0);
|
||||
|
||||
disp(X.logbook);
|
||||
disp(['BER: ', sprintf('%2E',BER)]);
|
||||
|
||||
|
||||
|
||||
192
setup_simulation.m
Normal file
192
setup_simulation.m
Normal file
@@ -0,0 +1,192 @@
|
||||
clear all
|
||||
|
||||
O = 18; %order of prbs
|
||||
N = 2^(O-1); %length of prbs
|
||||
[~,seed] = prbs(O,1); %initialize first seed of prbs
|
||||
|
||||
% Modulation
|
||||
M = 4; %PAM-M
|
||||
bitpattern = zeros(N,log2(M));
|
||||
|
||||
% Symbol Rate
|
||||
fsym = 112e9;
|
||||
% DAC Rate
|
||||
fdac = 160e9;
|
||||
% Simulation oversampling rate "k";
|
||||
kover = 16;
|
||||
% ADC Rate
|
||||
fadc = 256e9;
|
||||
% Simulation frequency in "analog domain"
|
||||
fsimu = kover * fdac ;
|
||||
|
||||
%% CONSTRUCT ALL CLASSES
|
||||
|
||||
pam_mapper = PAMmapper(M,0);
|
||||
|
||||
awg = AWG('preset','M8199B','fdac',fdac,'kover',kover,'lpf_active',0,'f_cutoff',80e9,'lpf_type',filtertypes.gaussian);
|
||||
|
||||
fil_50 = Filter('filtdegree',1,"f_cutoff",50e9,"fsamp",fdac,"filterType",filtertypes.bessel_inp);
|
||||
|
||||
u_pi = 3.5;
|
||||
vbias = (0.5*u_pi)-u_pi;
|
||||
extmodlaser = EML("mode",emlmodes.im_cosinus,"power",5,"fsimu",fsimu,"lambda",1550,"bias",vbias,"u_pi",u_pi,"linewidth",0);
|
||||
|
||||
amp = Amplifier("amp_mode","ideal_no_noise","amplification_db",0,"gain_mode","output_power");
|
||||
|
||||
fib = Fiber("fsimu",fdac*kover,"fiber_length",0,"alpha",0.2,"D",17,"lambda0",1550);
|
||||
|
||||
% %noise loading
|
||||
% zeroDB_attenuator = Amplifier("amp_mode","ideal_no_noise","gain_mode","output_power","amplification_db",0);
|
||||
%
|
||||
% edfa_ = Amplifier("amp_mode","edfa_increase_nase","nase_mode","generate_ase","amplification_db",0,"noifig",33,"gain_mode","output_power");
|
||||
%
|
||||
% rop_amplifier = Amplifier("amp_mode","ideal_no_noise","amplification_db",-5,"gain_mode","output_power","nase_mode","pass_ase");
|
||||
|
||||
% X = zeroDB_attenuator.process(X);
|
||||
% X = edfa_.process(X);
|
||||
% X = rop_amplifier.process(X);
|
||||
|
||||
phdiode = Photodiode("fsimu",fdac*kover,"dark_current",2e-08,"responsivity",1,"temperature",20);
|
||||
|
||||
fil_diode = Filter('filtdegree',1,"f_cutoff",120e9,"fsamp",fdac,"filterType",filtertypes.bessel_inp);
|
||||
|
||||
scp = Scope("fsimu",fdac*kover,"fadc",fadc,...
|
||||
"delay",0,"fixed_delay",0,"lpf_bw",113e9,"filtertype",filtertypes.butterworth,...
|
||||
"samplingdelay",0,"rand_samplingdelay",0,"freq_offset",0,"samp_jitter",0,...
|
||||
"adcresolution",6,"quantbuffer",0.1);
|
||||
|
||||
eq = EQ("K",2,"plottrain",0,"plotfinal",1,...
|
||||
"training_length",4096*2,"training_loops",5,...
|
||||
"Ne",[50,9,9],"Nb",[0,0,0],...
|
||||
"DCmu",0.005,"DDmu",[0.0004 0.0004 0.0004 0.0004 ],"DFEmu",0.005,"FFEmu",0.000,...
|
||||
"dd_loops",2,"epsilon",[10 100 1000 ],"M",4,...
|
||||
"thres",[0.005 0.004 0.0005 ],"l1act",0,"delay",0,"rho",0.0005,"ideal_dfe",0);
|
||||
|
||||
|
||||
%% PROCESS
|
||||
% INFORMATION SIGNAL
|
||||
for i = 1:log2(M)
|
||||
[bitpattern(:,i),seed] = prbs(O,N,seed);
|
||||
end
|
||||
|
||||
bits = Informationsignal(bitpattern);
|
||||
|
||||
mod_out = pam_mapper.map(bits);
|
||||
|
||||
reference = mod_out;
|
||||
|
||||
mod_out.signal = applyPulseShaping(mod_out.signal,fsym,fdac);
|
||||
|
||||
% ELECTRICAL DOMAIN
|
||||
X = awg.process(mod_out);
|
||||
|
||||
X = X.normalize;
|
||||
|
||||
% OPTICAL DOMAIN
|
||||
X = extmodlaser.process(X);
|
||||
|
||||
X = amp.process(X);
|
||||
|
||||
X = fib.process(X);
|
||||
|
||||
X = phdiode.process(X);
|
||||
|
||||
X = fil_diode.process(X);
|
||||
|
||||
% ELECTRICAL DOMAIN
|
||||
% X = scp.process(X);
|
||||
|
||||
X = X.resample("fs_out",2*fsym,"fs_in",fsimu);
|
||||
|
||||
% INFORMATION SIGNAL
|
||||
X = X.normalize;
|
||||
eq_out = eq.process(X,reference);
|
||||
rx_series = eq_out.signal;
|
||||
|
||||
demap_out = pam_mapper.demap(eq_out);
|
||||
|
||||
[bits,errors,BER] = calc_ber(demap_out.signal(:,10000:end-20),bitpattern(10000:end-19,:)',0);
|
||||
|
||||
|
||||
%%
|
||||
figure(22)
|
||||
clf
|
||||
subplot(3,1,1)
|
||||
hold on
|
||||
plot(reference.signal(10000:end-20));
|
||||
plot(rx_series(10000:end-20));
|
||||
hold off
|
||||
subplot(3,1,2)
|
||||
hold on
|
||||
plot(reference.signal(4150:4175));
|
||||
plot(rx_series(4150:4175));
|
||||
hold off
|
||||
subplot(3,1,3)
|
||||
hold on
|
||||
stem(demap_out.signal(1,4150:4175))
|
||||
stem(bitpattern(4150:4175,1)')
|
||||
hold off
|
||||
legend
|
||||
|
||||
xax = 1:eq_out.length;
|
||||
col = cbrewer2('Set1',4);
|
||||
|
||||
figure(12)
|
||||
sgtitle('Laser Linewidth = 10 MHz; SIR = 24 dB ; $N_{1,2}$ = 100')
|
||||
subplot(1,4,1:2)
|
||||
scatter(xax,eq_out.signal,4,'.','MarkerEdgeColor',col(1,:),'DisplayName','No MPI Mitigation');
|
||||
xlim([1, xax(end)]);
|
||||
ylim([-2 2]);
|
||||
xlabel('Sampling Index')
|
||||
ylabel('Amplitude')
|
||||
legend
|
||||
|
||||
subplot(1,4,3:4)
|
||||
scatter(1:X.length,X.signal,4,'.','MarkerEdgeColor',col(2,:),'DisplayName','A1');
|
||||
xlim([1, xax(end)]);
|
||||
ylim([-2 2]);
|
||||
xlabel('Sampling Index')
|
||||
ylabel('Amplitude')
|
||||
legend
|
||||
%
|
||||
% subplot(1,4,3)
|
||||
% scatter(xax,a2_out,4,'.','MarkerEdgeColor',col(3,:),'DisplayName','A2');
|
||||
% xlim([1, xax(end)]);
|
||||
% ylim([-2 2]);
|
||||
% xlabel('Sampling Index')
|
||||
% ylabel('Amplitude')
|
||||
% legend
|
||||
%
|
||||
% subplot(1,4,4)
|
||||
% scatter(xax,a1_a2_out,4,'.','MarkerEdgeColor',col(4,:),'DisplayName','A1+A2');
|
||||
% xlim([1, xax(end)]);
|
||||
% ylim([-2 2]);
|
||||
% xlabel('Sampling Index')
|
||||
% ylabel('Amplitude')
|
||||
% legend
|
||||
|
||||
% set(gcf,'Units','centimeters')
|
||||
% set(gcf,'Position',[2 2 25 10])
|
||||
|
||||
a = fftshift(xcorr(X.signal(1,:),circshift(bitpattern(:,1)',0)));
|
||||
|
||||
% BER
|
||||
if (length(X.signal) ~= length(bitpattern'))
|
||||
warning("TX and RX bitstreams have different length...")
|
||||
end
|
||||
|
||||
|
||||
|
||||
disp(demap_out.logbook);
|
||||
disp(['BER: ', sprintf('%2E',BER)]);
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
Reference in New Issue
Block a user