MATLAB: How to create a cosine filter

cosine filter

i treid to use this code
Nsym = 6;           % Filter span in symbol durations
beta = 0.5;         % Roll-off factor
sampsPerSym = 8;    % Upsampling factor
rcosFlt = comm.RaisedCosineTransmitFilter(...
  'Shape',                  'Normal', ...
  'RolloffFactor',          beta, ...
  'FilterSpanInSymbols',    Nsym, ...
  'OutputSamplesPerSymbol', sampsPerSym)
% Visualize the impulse response
fvtool(rcosFlt, 'Analysis', 'impulse')
but the matlab result is
??? Undefined variable "comm" or class
"comm.RaisedCosineTransmitFilter".
I hope that my question is clear ,thanks 🙂 >>

Best Answer

Do you have the Communication System Toolbox installed?
That functionality ships with that toolbox.
The Signal Processing Toolbox has functions for raised cosine filtering: rcosdesign()
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