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Adding figures for Kerr effect
[4yp.git]
/
CD_AWGN.m
diff --git
a/CD_AWGN.m
b/CD_AWGN.m
index
4db7aad
..
241d22a
100644
(file)
--- a/
CD_AWGN.m
+++ b/
CD_AWGN.m
@@
-1,18
+1,18
@@
-numSymbs =
5e5
;
+numSymbs =
2^16
;
M = 4;
Rsym = 2.5e10; % symbol rate (sym/sec)
rolloff = 0.25;
span = 6; % filter span
M = 4;
Rsym = 2.5e10; % symbol rate (sym/sec)
rolloff = 0.25;
span = 6; % filter span
-sps =
2
; % samples per symbol
+sps =
8
; % samples per symbol
fs = Rsym * sps; % sampling freq (Hz)
Tsamp = 1 / fs;
t = (0 : 1 / fs : numSymbs / Rsym + (1.5 * span * sps - 1) / fs).';
fs = Rsym * sps; % sampling freq (Hz)
Tsamp = 1 / fs;
t = (0 : 1 / fs : numSymbs / Rsym + (1.5 * span * sps - 1) / fs).';
-EbN0_db = 0:0.
2
:14;
+EbN0_db = 0:0.
5
:14;
EbN0 = 10 .^ (EbN0_db ./ 10);
Es = 1;
EbN0 = 10 .^ (EbN0_db ./ 10);
Es = 1;
@@
-36,26
+36,30
@@
x = txFilter(modData, rolloff, span, sps);
%% Simulate chromatic dispersion
D = 17; % ps / (nm km)
lambda = 1550; % nm
%% Simulate chromatic dispersion
D = 17; % ps / (nm km)
lambda = 1550; % nm
-z =
60;%
000; % km
+z =
3
000; % km
-usingFFT = 1
-
xCD = chromaticDispersion_FFT
(x, D, lambda, z, Tsamp);
-%%xCD = normalizeEnergy(xCD, numSymbs, 1);
-
%%xCD = x
;
+
+
[xCD, xCDkstart] = chromaticDispersion
(x, D, lambda, z, Tsamp);
+
+
TsampOrig = Tsamp
;
for i = 1:plotlen
for i = 1:plotlen
+ sps = 8;
+
snr = EbN0_db(i) + 10 * log10(log2(M)) - 10 * log10(sps);
snr = EbN0_db(i) + 10 * log10(log2(M)) - 10 * log10(sps);
- noiseEnergy = 10 ^ (-snr / 10);
y = awgn(xCD, snr, 'measured');
y = awgn(xCD, snr, 'measured');
- %%y = xCD;
r = rxFilter(y, rolloff, span, sps);
r = rxFilter(y, rolloff, span, sps);
- rCDComp = CDCompensation(r, D, lambda, z, Tsamp);
+
+ sps = 2;
+ Tsamp = TsampOrig * 4;
+
+ [rCDComp, CDCompkstart] = CDCompensation(r, D, lambda, z, Tsamp);
rCDComp = normalizeEnergy(rCDComp, numSymbs*sps, 1);
rCDComp = normalizeEnergy(rCDComp, numSymbs*sps, 1);
- rSampled = rCDComp(
sps*span/2+1:sps:(numSymbs+span/2)*sps
);
- rNoCompSampled = r(
sps*span/2+1:sps:(numSymbs+span/2)*sps
);
+ rSampled = rCDComp(
2:2:end
);
+ rNoCompSampled = r(
2:2:end
);
%% rotate rNoCompSampled to match original data
theta = angle(-sum(rNoCompSampled .^ M)) / M;
%% rotate rNoCompSampled to match original data
theta = angle(-sum(rNoCompSampled .^ M)) / M;