How to create a 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 :) >>

Answer 1

[Wayne King]

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()

[Nasser Dav]

no, can i download it from the web ?

Answer 2

[Ken]

I have a similar problem. Can someone tell us how to fix this. I have othe comm. functions in my package. More so, I have this RaisedCosine filter in my Simulink package, and it works perfectly.

[Yingyu]

Exactly, I also have the same problem. I have used >>ver to double confirm that I have the Signal Processing Toolbox. However when I typed the commands like what Nasser Dav did, I received the same error. =(