Chromatic dispersion and line width phase noise

[4yp.git] / txFilter.m

diff --git a/txFilter.m b/txFilter.m
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+++ b/txFilter.m
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+function x = txFilter(modData, rolloff, span, sps)
+  %% Transmitter pulse-shaping (root raised cosine) filter.
+  %% Inputs:
+  %%  - modData: modulated data
+  %%  - rolloff: rolloff factor in root raised cosine filter.
+  %%  - span: filter span (number of symbols)
+  %%  - sps: samples per symbol
+  %% Output:
+  %%  - x: pulse-shaped waveform
+
+  filter = comm.RaisedCosineTransmitFilter...
+               ('Shape', 'Square root', ...
+                'RolloffFactor', rolloff, ...
+                'FilterSpanInSymbols', span, ...
+                'OutputSamplesPerSymbol', sps);
+  x = filter([modData; zeros(span, 1)]);
+end